Ecell for each of the following reactions i.e. (1, 2, 3) reactions are (-1.52 V, non-spontaneous); (1.99 V, spontaneous); (1.51 V, spontaneous) respectively.
1) 2Cu(s)+Mn2+(aq)→2Cu+(aq)+Mn(s).
To calculate the Ecell∘ for this reaction, we need to know the standard reduction potentials (E0) of the half reactions.
Cu2+(aq) + 2e- → Cu(s) E0 = +0.34 V
Mn2+(aq) + 2e- → Mn(s) E0 = -1.18 V
Ecell = E0 (products) - E0 (reactants)
Ecell = (-1.18 V) - (+0.34 V) = -1.52 V
Since the Ecell value is negative, this means that the reaction is not spontaneous as written (it is non-spontaneous or endothermic) and it would require an input of energy to occur.
2) MnO2(s)+4H+(aq)+Zn(s)→Mn2+(aq)+2H2O(l)+Zn2+(aq)
To calculate the Ecell∘ for this reaction, we need to know the standard reduction potentials (E0) of the half-reactions.
MnO2(s) + 4H+ + 2e- → Mn2+ + 2H2O(l) E0 = +1.23 V
Zn(s) + 2e- → Zn2+(aq) E0 = -0.76 V
Ecell = E0 (products) - E0 (reactants)
Ecell = (+1.23 V) - (-0.76 V) = 1.99 V
Since the Ecell value is positive, this means that the reaction is spontaneous as written (it is exothermic) and it would release energy as it occurs.
3) Cl2(g)+2F−(aq)→F2(g)+2Cl−(aq)
To calculate the Ecell∘ for this reaction, we need to know the standard reduction potentials (E0) of the half-reactions.
Cl2(g) + 2e- → 2Cl-(aq) E0 = +1.36 V
2F-(aq) + 2e- → F2(g) E0 = +2.87 V
Ecell = E0 (products) - E0 (reactants)
Ecell = (+2.87 V) - (+1.36 V) = 1.51 V
Since the Ecell value is positive, this means that the reaction is spontaneous as written (it is exothermic) and it would release energy as it occurs.
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What are the two main components of the peripheral nervous system?
A.
the sympathetic nervous system and spinal cord
B.
the sensory and motor neurons
C.
the brain and spinal cord
D.
the parasympathetic nervous system and senses
Answer: i believe it would be A
Answer:
a and d
Explanation:
what ppe should you use when working with a hazardous chemical that poses a risk of a splash hazard but not an inhalation hazard? (select all that apply)
Splash aprons protect your body against corrosive chemicals.
Still, similar as pouring the contents of one vessel into another, splash aprons are demanded, If you're handling a sharp material in such a way as to present a significant splash hazard.
PPE includes overalls, aprons, footwear, gloves, chemical resistant spectacles, face securities and respirators. For some high- threat conditioning, similar as spray oil, abrasive firing and some exigency response conduct, PPE should always be used to condense advanced position control measures.
The stylish control for limiting exposure to chemical vapor in the lab is a duly operating chemical cloud hood or glove box. Point exhausts (e.g., exhaust snorkels) may be effective controls for some chemical vapors, but a threat assessment must be done to determine whether a point exhaust will be sufficient.
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A tank contains 100 gal of brine made by dissolving 60 lb of salt in water. Saltwater containing 1 lb of salt per gallon runs in at the rate of 2 gal/min and the well-stirred mixture runs out at the rate of 3 gal/min. Find the amount of salt in the tank after 30 minutes.
The presented statement states that 52.5 lbs. of salt had been consumed after 30 minutes.
What three kind of salt are there?Salts come in a variety of forms, such as a double salt, corrosive salt, or basic salt. A salt that forms when a potent acid and a feeble base interact is referred to as a "acidic salt."
There seem to be initially 100 gal with in tank. The amount of salt is 60 lbs. The tank has a salt content of 60/100, or 0.6 pounds per gal.
One pound per gallon of water is coming in.
Because the combination is continually varying, the concentration of the water that comes out is uncertain.
Each minute, the tank is dropping 1 gal. (3-2=1)
Utilize this information to configure three functions for volume, saturation, and salt content: V(t), S(t), and C(t).
V (t) = 100 - t
s (t) = 60 plus 2t - 3t * C (t)
C (t) = s(t)/V(t) = 60 + 2t - 3t * C(t)/ 100 - t
Solve for C with a little mathematics (t)
C (t) = 60 + 2t / 100 + 2t
Now, we are aware of the tank's salt content at all times.
Evaluate at t = 30
C (30) = 60 + 2(30)/100 - 2(30) = 120/160 = 3/4
s(30) = 60 + 2(30) - 3(30)(3/4) = 120 - 90(3/4) = 52.5
Consequently, 52.5 lbs of salt had been consumed within 30 minutes.
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Determine the molecular geometry IBr−4 and make a sketch
IBr4 has square planar geometry and its hybridization is sp3d2.
Iodine and bromine make up the two different halogen atoms that make up the inter-halogen compound IBr4-. It only partially dissolves in benzene and ether. The central Iodine atom of the IBr4-Lewis structure, which has a -1 formal charge and is covalently bonded to four Bromine atoms, is present. The IBr4-Lewis structure has a square planar shape. The central iodine atom is surrounded by two lone pairs of electrons on either side, four bonding electron pairs on one plane, and four bonding electron pairs arranged in a square pattern. This molecule has the generic formula AX4E2 according to VSEPR theory.Sp3d2 hybridization is present in the IBr4-molecule. One electron from the central iodine atom's 5s and 5p orbitals is promoted to the 5d orbital, where it combines with another electron to form a 6 sp3d2 hybrid orbital with the same energy. Each sp3d2 hybrid orbital combines with a bromine atom's 4p orbital to form an I-Br bond.
The attached image shows structure of IBr-4
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London Dispersion of attraction between molecules always decrease with
a. increasing molecular size and increasing distance between the molecules
b. increasing molecular size and decreasing distance between the molecules
c. decreasing molecular size and increasing distance between the molecules
d. decreasing molecular size and decreasing distance between the molecules
Answer:
Therefore, as they are less tightly held and can move easily in order to form temporary dipole, the london dispersion forces between molecules always decreases when we increase the molecular size and decrease the distance between the molecules. Therefore, the correct option is option b.
which structure represents the most stable conformation of cis-1-tert-butyl-4-methylcyclohexane?
The most stable conformation of cis-1-tert-butyl-4-methylcyclohexane is a chair conformation. In this conformation, the tert-butyl group and a methyl group are located on opposite sides of the ring, and the two groups are staggered.
This conformation minimizes the steric repulsions between the two groups and is the most energetically favorable conformation. In this conformation, the four methylene groups of the tert-butyl group and the methyl group are aligned in a chair-like structure.
The two methyl groups are axial and the tert-butyl group is equatorial. This conformation is favored because it minimizes the steric repulsions between the two groups and the other substituents on the ring. The axial positions of the two methyl groups also help to minimize the steric interactions, as they are further away from the other substituents.
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hydrogen sulfide (g) + oxygen(g)water (l) + sulfur dioxide(g)
When hydrogen sulphide gas combines with oxygen gas, sulphur dioxide gas and water are produced.
Given,
Hydrogen sulfide (g) + oxygen(g) → sulfur dioxide(g) + water (l)
Equation: H2S(g) + O2(g) → SO2(g) + H2O(l)
Balanced equation: 2H2S(g) + 3O2(g) → 2SO2(g) + 2H2O(l)
H2S is the chemical formula for hydrogen sulphide. It is a colorless chalcogen-hydride gas that is toxic, caustic, and combustible, with tiny levels in the ambient environment emitting a distinct rotten egg stench. The process of balancing all stoichiometric coefficients just on reactants and product sides of a chemical equation.
This is required because the chemical equation follows the principles of mass and momentum conservation. H2S interacts with oxygen (O2) to produce solid sulphur (S) as well as water (H2O). It is a redox process because it involves both the oxidation of hydrogen sulphide towards sulphur and the reduction of oxygen to water.
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Draw the Lewis dot structure for Al.
The Lewis dot structure for Al (Aluminium) is attached.
Aluminum is located in Group IIIA of the periodic table, and as a result, it possesses three valence electrons. Al is the symbol that is used to represent it. One atom of aluminium has a total of 13 electrons within it. There are eight electrons in the second orbit, three electrons in the third orbit, and two electrons in the first orbit. As a result, the Lewis structure of it consists of three dots surrounding it. Al is the symbol that is used to represent it. The Lewis dot structure for Al (Aluminium) is attached.
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QUIZ 3: GOLDEN YEARS TO BOHR MODEL quizleConsider the two electron arrangements for neutral atoms A and B. What is the atomic number of A
The atomic number of A is 8, since it has 8 protons. The atomic number of B is 10, since it has 10 protons.
The atomic number of an atom is the number of protons it contains. Protons have a positive charge and are found in the nucleus of the atom. Therefore, atoms with more protons will have higher atomic numbers. In this case, atom A has 8 protons while atom B has 10 protons, so atom A has an atomic number of 8 and atom B has an atomic number of 10.
The atomic number of an atom is determined by the number of protons it has in its nucleus, and atoms with more protons will have higher atomic numbers.
Complete question
Consider the two electron arrangements for neutral atoms A and B. What is the atomic number of A?
A - 1s2, 2s2, 2p6, 3s1
B - 1s2, 2s2, 2p6, 5s1
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If the free energy change ΔG for a reaction is -46.11 kJ/mol, the reaction is:
A. at equilibrium.
B. endergonic.
C. endothermic.
D. exergonic.
E. exothermic.
The reaction is exergonic reaction if the free energy change ΔG for a reaction is -46.11 kJ/mol.
Exergonic reactions are those that release energy in the form of heat or light, and have a negative ΔG. In other words, the products have less free energy than the reactants, and the reaction proceeds spontaneously. The ΔG is a measure of the thermodynamic feasibility of a reaction, and a negative ΔG indicates that the reaction is energetically favorable, and it will release energy and proceed spontaneously.In chemistry, the symbol ΔG stands for the change in Gibbs free energy, which is a measure of the feasibility of a chemical reaction. The Gibbs free energy is a thermodynamic state function that combines the energy of a system (enthalpy, H) with the entropy (S) of a system and the temperature (T) in which the reaction occurs. It is represented by the equation ΔG = ΔH - TΔS.
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in an equilibrium mixture the partial pressure of s02 and o2 are .135atm and .455 atm, respetively, what is the equilibrim partial pressure of s03 in the mixture>
In an equilibrium mixture the partial pressure of s02 and o2 are .135atm and .455 atm, respectively, 0.135atm is equilibrium partial pressure of SO₃ in mixture.
2SO₂(g) + O₂(g) ⇔ 2SO₃(g)
[tex]K_{p} = \frac{P_{SO_{3} } }{P_{SO_{2} P_{O_{2} } } } = \frac{1}{P_{O_{2} } }[/tex]
Partial pressure of So₃ and SO₂ is same at equilibrium because moles of SO₂ and SO₃ are same at equilibrium.
When the partial pressure of any of the gaseous reactants or of the products is increased, the position of equilibrium is shifted so as to decrease its partial pressure. This is usually achieved by favoring the reaction in which there is decrease in the number of moles of gaseous components.
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I have a solid with two different melting points. What can you tell about the solid?
The melting point differ with respect to the bond type and structure of the solid. If a solid have two different melting points, then it must acquiring tow different structures that can be interchangeable.
What is melting point?Melting point of a substance is the temperature at which its solid state changes to liquid state where the two states are in equilibrium. The melting point of a substance depends on the bond type, molar mass, temperature and pressure.
The more strong the bond is, greater will be the melting point. Melting point is a characteristic property of a compound and we can determine the purity using melting point.
If a solid exhibits two melting points, then it might having two different structures and bond types. The structure can be changed through resonance, tautomerism etc. and it can have tow melting points.
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two unbalanced half-reactions are given. hno2(aq)→no(g) cu+(aq)→cu2+(aq). Write an overall unbalanced reaction. Express your answer as a chemical equation.
The overall unbalanced reaction can be written as:
HNO₂(aq) + Cu⁺(aq) + e- → NO(g) + Cu²⁺(aq)
An overall unbalanced reaction can be formed by combining two unbalanced half-reactions. In this case, the two unbalanced half-reactions are:
HNO₂(aq) → NO(g)
Cu⁺(aq) → Cu²⁺(aq)
To form an overall unbalanced reaction, we need to balance the number of electrons and the number of atoms on both sides of the equation. This can be achieved by multiplying the half-reactions by appropriate coefficients.
The first half-reaction, HNO₂(aq) → NO(g), involves the gain of one electron from HNO₂ (+3 in N) to form NO (+2 in N).
The second half-reaction, Cu⁺(aq) → Cu²⁺(aq), involves the lose of one electron by Cu⁺ to form Cu²⁺.
The overall unbalanced reaction can be written as:
HNO₂(aq) + Cu⁺(aq) + e- → NO(g) + Cu²⁺(aq)
This overall reaction represents the oxidation of HNO₂ by Cu⁺ to produce NO and Cu²⁺
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The tendency of molecules of the same kind to stick together is called ______. ______ is stronger for _____ then most other liquids
Cohesion is the tendency for molecules of the same kind to stick together. The cohesion of water is stronger than that of most other liquids.
Water molecules have strong cohesive forces as a result of their capacity to form hydrogen bonds with one another. The scientific term cohesion describes the attraction between molecules of the same type. The interactions of water molecules can be described by two characteristics, cohesion and adhesion. As well as the interactions between water molecules and other things, such as leaves or even yourself. Water likes to stick to itself, which is referred to as cohesion, while adhesion refers to water's affinity for sticking to other objects.
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Please Help Quick ASAP Hurry Chemistry Unit 4 Review Sheet
3. Refer to the equation below of the reaction of Nitrogen with hydrogen. If 16.7 grams of Nitrogen react, then:
N2(g) + 3H2(g) → 2NH3(g)
a. How many moles of NH3 are produced?
Work:
Ans:__________
Answer:1.2molammonia formed
Explanation:
N2(g) + 3H2(g) → 2NH3(g)\
According to the above-balanced chemical equation
28g nitrogen reacts with 6g hydrogen to give out 34g ammonia,
therefore 16.7g nitrogen= 16.7*34/28=20.28g ammonia
the molecular weight of ammonia =17g/mol
therefore number of moles in 20.28g=20.28/17=1.2 mol
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calcium silicate reacts with hydrofluoric acid to form calcium fluoride, silicon tetrafluoride and water. if 25.2-g of calcium silicate reacts with 16.0-g of hydrofluoric acid, how many grams of calcium fluoride will be recovered at the end of the reaction?
The mass of calcium fluoride recovered at the end of the reaction is 31.14 g.
What is reaction?Reaction is the response to a stimulus, either physical or mental.
The balanced equation for the reaction between calcium silicate and hydrofluoric acid is as follows:
CaSiO3 + 2 HF → CaF2 + SiF4 + H2O
We can use the given masses of calcium silicate and hydrofluoric acid to calculate the mass of calcium fluoride formed at the end of the reaction. As we can see from the equation, 2 mol of HF are required for every 1 mol of CaSiO3. Thus, the number of moles of HF present is equal to half the number of moles of CaSiO3.
The number of moles of CaSiO3 present can be calculated by dividing the given mass of CaSiO3 (25.2 g) by the molar mass of CaSiO3 (136.14 g/mol). This gives us a value of 0.185 mol of CaSiO3.
Since the number of moles of HF present is half the number of moles of CaSiO3, the number of moles of HF present is 0.0925 mol. We can calculate the mass of HF present by multiplying the number of moles of HF (0.0925 mol) by the molar mass of HF (20.01 g/mol). This gives us a value of 1.85 g of HF.
Since the given mass of HF (16.0 g) is greater than the calculated mass of HF (1.85 g), it means that there is excess HF present in the reaction. The excess HF present will result in more calcium fluoride being formed in the reaction.
To calculate the mass of calcium fluoride formed in the reaction, we need to calculate the number of moles of calcium fluoride formed. We can do this by dividing the mass of HF present (16.0 g) by the molar mass of HF (20.01 g/mol). This gives us a value of 0.799 mol of HF. Since 2 mol of HF are required for every 1 mol of CaSiO3, the number of moles of CaF2 present is 0.799/2 = 0.3995 mol.
We can now calculate the mass of calcium fluoride formed by multiplying the number of moles of CaF2 (0.3995 mol) by the molar mass of CaF2 (78.00 g/mol). This gives us a value of 31.14 g of CaF2.
Thus, the mass of calcium fluoride recovered at the end of the reaction is 31.14 g.
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Drag each number to the correct location on the equation. Each number can be used more than once, but not all numbers will be used.Balance the equation with the correct coefficients.
A chemical equation is said to be balanced when there are an equal number of atoms on both the reactant and product sides.
[tex]KCl3 = KCL + O2[/tex]
In this case-
Therefore, we multiply by 2 on the reactant side and by 2 and 3 on the product side of the equation to make it equal. Equal numbers and types of each atom are present on both sides of balanced chemical equations. A balanced equation must have coefficients that are the easiest whole number ratio. Chemical reactions always preserve mass.
These are the atom counts on the reactant side.
K = 1
Cl = 1
O = 3
These are the atom counts on the product side.
K = 1
Cl = 1
O = 2
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Calcium perbromate, Ca(BrO4)2 (m.w.= 327.9 g/mol) decomposes upon heating to release oxygen gas according to the equation below. A sample containing Ca(BrO4)2 is heated and the gas produced collected by downward displacement of water at 50.0°C. The total volume of gas collected was 438.0 ml at an atmospheric pressure of 680 torr. The vapor pressure of water at 50.0°C is 92.5 torr.
Ca(BrO4)2 (s) \rightarrow CaBr2 (s) + 4 O2 (g)
a.) Calculate the number of grams of Ca(BrO4)2 in the original sample. b.) calculate the mole fraction of oxygen in the collected gas mixture
The number of grams of Ca(BrO4)2 in the original sample is 1.19 g. the mole fraction of oxygen in the collected gas mixture is 1.
What is calcium perbromate?Calcium perbromate (Ca(BrO4)2) is a chemical compound composed of calcium, bromine and oxygen. It is a white crystalline solid that is highly water-soluble. It is used in the production of bromine compounds and as an oxidizing agent in organic synthesis.
a) To calculate the number of grams of Ca(BrO4)2 in the original sample, we can use the Ideal Gas Law:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
By rearranging the equation and assuming that the number of moles of gas is equal to the number of moles of oxygen gas produced by the decomposition, we can calculate the number of moles of oxygen produced.
n = (PV) / (RT)
n = (680 torr x 438.0 ml) / (0.08206 Latm/molK x 323.15 K)
n = 0.0144 moles
Given the equation of the reaction:
Ca(BrO4)2 (s) -> CaBr2 (s) + 4 O2 (g)
we can calculate the number of moles of Ca(BrO4)2:
n(Ca(BrO4)2) = n(O2) / 4
n(Ca(BrO4)2) = 0.0144 moles / 4 = 0.0036 moles
And then the number of grams of Ca(BrO4)2 in the original sample:
mass = n x molar mass
mass = 0.0036 moles x 327.9 g/mol = 1.19 g
b) To calculate the mole fraction of oxygen in the collected gas mixture, we first need to calculate the number of moles of oxygen produced by the reaction:
n(O2) = 0.0144 moles
then we can calculate the total number of moles of gas present in the collected mixture by using the Ideal gas law PV = nRT and assuming that the gas behaves as an ideal gas:
nT = (PV) / RT
nT = (680 torr x 438.0 ml) / (0.08206 Latm/molK x 323.15 K)
nT = 0.0144 moles
then we can calculate the mole fraction of oxygen in the collected gas mixture:
X(O2) = n(O2) / nT
X(O2) = 0.0144 moles / 0.0144 moles = 1
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Match the following definitions to the most appropriate term: a substance that donates one proton when dissolved in water [ Choose] a substance that donates two protons when dissolved in water [ Choose ]
a substance that donates three protons when dissolved in water any ionic compound whose cation comes from a base and whose anion comes from an acid [Choose] the solution in the buret [ Choose] the solution in the flask [Choose]
Monoprotic and diprotic substances are those that donate one proton and two protons, respectively, when dissolved in water.
Any acid that contains two hydrogen atoms and can release or ionise in water, such as carbonic acid and sulphuric acid.Diprotic acids have two acidic hydrogen atoms and include sulfuric acid (H2SO4), carbonic acid (H2CO3), hydrogen sulphide (H2S), chromic acid (H2CrO4), and oxalic acid (H2C2O4).
One hydrogen atom or proton can be given away by monoprotic acids to their aqueous solution.Since mono means "one," a monoprotic acid is an acid that will only donate one proton. One hydrogen ion or multiple hydrogen ions may exist in a monoprotic acid. However, only one will be given as a response.
Monoprotic acids include benzoic acid (C6H5CO2H), acetic acid (CH3CO2H or HOAc), nitric acid (HNO3), and hydrochloric acid (HCl).
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Water is a polar solvent and hexane (C6H14) is a nonpolar solvent. Which of the following correctly describes the solubility of the solute?
Option d, NAHCO3, soluble in water, is the appropriate response to this McQuestion.
The family of inorganic compounds known as sodium bicarbonate (also referred to as washing soda, soda ash, and soda crystals) has the formula Na 2CO 3(H 2O)x, where x can be any value between 0 and 10. All forms are white, odourless salts that dissolve in water and produce alkaline solutions. As a result of hydrogen bonding. While Na2CO3 has no hydrogen bond donor sites, NaHCO3 does. One hydrogen bond for every four to five carbons in an organic compound may be sufficient to make it water soluble. AFAIK, the polymer anionic structure of NaHCO3 is held together by hydrogen bonds. A weak base, sodium bicarbonate separates into sodium and bicarbonate ions in water. It is therefore polar; sodium gains a positive charge while bicarbonate gains a negative charge.
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In nature, most double bonds of fatty acids are in the _________ formation, but after hydrogenation many have been converted to _________ formation.
In nature, most double bonds of fatty acids are in the cis formation, but after hydrogenation many have been converted to trans formation.
Yes, that is correct. The cis formation of double bonds in fatty acids is more common in nature due to the geometric arrangement of the atoms, as it allows for the most efficient packing of atoms.
However, when hydrogen is added to the double bond, the geometric arrangement of the atoms changes, converting the cis formation to a trans formation. This process is known as hydrogenation, and it is used to increase the stability and shelf life of fatty acid compounds.
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12. If a lab experiment is not completed, you should... A. Discuss the issue with your instructor. B. Sneak in after school and work alone. C. Come in during lunch and finish while eating. D. Make up some results. • 13. You are heating a substance in a test tube. Always point the open end of the tube.... A Towed yourself B. Toward your lab partner. C. Toward another classmate. D. Away from all people. . 14. You are heating a piece of glass and now want to pick it up. You should... A. Use a rag or paper towels. B. Pick up the end that looks cooler. C. Use Tongs. D. Ask someone else to pick it up . 15. You have been injured in the laboratory (cut, burn, etc.). First you should... A. Visit the nurse after class. B. See a doctor after school. C. Tell the Lab Instructor at once. D. Apply first aid yourself. • 16. When using glassware and equipment for an experiment, you should... A. Read all directions carefully to know what equipment is necessary. B. Examine all glassware to check for chips or cracks. C. Clean any glassware that appears dirty. D. All of the above. • 17. If a piece of equipment is not working properly, stop, turn it off, and tell... A. The cleaning helper. B. Your lab partner. C. Your best friend in the class. D. The Lab Instructor. . 18. If an acid is splashed on your skin, wash at once with... A Soap. B. Oil. C. Weak base. D. Plenty of water.
Laboratory environments can be dangerous because of the existence of explosive compounds, potentially toxic microbes, volatile solvents, high pressure gases, and hazardous and caustic substances.
What is safety in the laboratory?The presence of hazardous and caustic substances, volatile solvents, high pressure gases, explosive compounds, and potentially harmful bacteria in a laboratory raises safety concerns. Mistakes in the lab can be avoided with a little caution and respect to established safety requirements.
Make sure you are protected from any splashes by covering up any exposed skin with clothing and footwear. Keep long hair, jewellery, and other anything that could get caught in gear in a ponytail. Never use cosmetics (including lip balm) or contact lenses in a lab setting, and never eat, drink, chew gum, or consume liquids.
Suitable facilities and equipment, suitable training, PPE, chemical management, standard operating procedures, waste disposal, signage, proper laboratory practices, and secure working conditions are all part of good laboratory safety measures.
Therefore, the answers are:
12. a)discuss the issue with your instructor.
13. D)away from all people.
14. c)use tongs.
15. You were hurt in the laboratory (cut, burn, etc.) Visit the school nurse after class as your first course of action. after school, visit a doctor.
16. a) Read all directions carefully to know what equipment is necessary.
17. d) The Lab instructor.
18. d) Plenty of water.
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Calculate the volume of a gas (in L) at a pressure of 1.00 x 10^2 kPa if its volume at 1.20 x 10^2 kPa is 1.50 x 10^3 ml
Based on the provided information, the volume of a gas (in L) is 1.8L.
Boyle’s law refers to an experimental gas law that describes the relationship between pressure and volume of a confined gas. Boyle's law states that the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies if the temperature and amount of gas remain unchanged within a closed system. When comparing the same substance under two different sets of conditions, the law can be expressed as:
P1V1 = P2V2
In the given case,
P1 = 1.20 x 10^2 kPa
V1 = 1.50 x 10^3 ml
P2 =1.00 x 10^2 kPa
V2 = ?
(1.20 x 10^2)( 1.50 x 10^3) = (1.00 x 10^2)V2
V2 = 1.8 x 10^3 ml or 1.8L
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Preview File Edit View Go Tools Window Help 68%CI, Thu 1:57 PM a :E diels alder anthracene and maleic anhydride.pdf (page 4 of 10) When anthracene's center ring reacts as a diene, the product has two fully aromatic rings, each with six pi electrons, as shown in Equation 3. (Eq. 3) maleic anhydride (dienophile) anthracene adduct) (diene) The reaction is carried out in xylene, which is actually a mixture of the three dimethylbenzenes, for three reasons. First, the 140 °C boiling point provides a good reaction temperature. Second, the xylene mixture does not freeze when it is cooled in ice water. Third, the reactants are more soluble in xylene than is the product, which crystallizes. The product is a relatively stable anhydride. Although anhydrides re- act with water in air, this one reacts slowly and is easily isolated and char- acterized before much hydrolysis occurs to name the product, but 9,10-dihydroanthracene-9,10- ,?-succinic anhy- dride is probably the simplest. . There are several possible ways
Diels-Alder (DA) reaction is incredibly valuable method for the synthesis of 6-rings,It is not within the remit of this course to go into detail about this reaction.
• We are interested in the stereochemical outcome but need a bit of revision.
• Normally DA is highly regioselective
toluene, 120°C, no catalyst 59 benzene, 25°C, SnCl4 96
Lewis acid improves selectivity
• It is controlled by the ‘relative sizes’ of the p orbitals in the LUMO & HOMO involved
• More accurately referred to as the orbital coefficients
• In the presence of a Lewis acid dienophile is polarised giving higher regioselectivity and a faster reaction NMe2 + regioselectivity often follows simple electronic argument (consider which C is δ+ve or δ–ve)
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A change in momentum from applying a force for a certain time is:
A change in momentum from applying a force for a certain time is called an impulse.
What is in physics the word momentum?In physics, the word momentum can be defined as a type of measurement that indicates mass motion, which is generally denoted by the letter p and can be used to understand the impulse properties of a given compound and or material.
Therefore, with this data, we can see that in physics the word momentum is used to understand the motion of the mass and thus determine the kinetic properties of an element.
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Why is it necessary to calibrate the spectroscope used in this experiment?
a. The spectroscope has to be calibrated so the wavelength reading on the spectroscope scale can be converted into an angular reading.
b. The spectroscope has to be calibrated so the degrees on the spectroscope scale can be converted into wavelength.
c. The spectroscope has to be calibrated so you can physically see the emission spectrum of helium.
d. The spectroscope has to be calibrated so you can physically see the emission spectrum of hydrogen.
It necessary to calibrate the spectroscope used in this experiment because The spectroscope has to be calibrated so the degrees on the spectroscope scale can be converted into wavelength.
About Spectrometer, Spectroscope, and SpectrographA spectrometer is any instrument used to probe a property of light as a function of its portion of the electromagnetic spectrum, typically its wavelength, frequency, or energy. The property being measured is usually intensity of light, but other variables like polarization can also be measured. Technically, a spectrometer can function over any range of light, but most operate in a particular region of the electromagnetic spectrum.
A spectroscope is a device that measures the spectrum of light. Early versions had a slit, a prism, and a screen with markings to indicate various wavelengths or frequencies; later versions were calibrated to electronic detectors. Although the apparatus Isaac Newton used in his work on the spectrum of light can be considered a crude spectroscope, it is generally recognized that the spectroscope was invented by Gustav Kirchhoff and Robert Bunsen around 1860.
A spectrograph is an instrument that separates incoming light by its wavelength or frequency and records the resulting spectrum in some kind of multichannel detector, like a photographic plate. Many astronomical observations use telescopes as, essentially, spectrographs.
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Predict the products for the single replacement reactions given. check to see that the equations are balanced. ca mgcl2 → ? cacl2 mg ca cl2 mg cl2 cacl mg
When a less active ingredient in a molecule can be changed with a more reactive element, we forecast that just one reaction will take place. Ca + MgCl₂ → CaCl₂ + Mg will be the chemical equation for a fair system.
What are equations in science?An illustration of a chemical that is often expressed as a linear array with an arrow or a group of arrows separating the symbols and amounts of the reactants and those of the products.
The given equation is Ca + MgCl₂ →
It is well known that when calcium (Ca) reacts with magnesium chloride (MgCl₂), calcium chloride (CaCl₂) and magnesium are produced.
Ca + MgCl₂ → CaCl₂ + Mg.
Calcium only has atom on the photocatalyst surface and one on the product side, as can be seen. Chlorine, from the other hand, has one atom on both the reactant and product sides.
As a result, the response will be balanced.
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Aubree's car used 4 gallons to travel 120 miles. How many miles can the car go on one gallon of gas?.
The car can go 30 miles on one gallon of gas.
Distance is the sum of an object's movements, regardless of direction. Distance can be defined as the amount of space an object has covered, regardless of its starting or ending position.
Vehicles running on compressed natural gas (CNG) operate similarly to those driven by gasoline and equipped with spark-ignited internal combustion engines. The engine operates similarly to a gasoline engine. In a fuel tank, or cylinder, usually at the back of the car, natural gas is kept.
Gallons of gas used by car = 4
distance covered by car = 120 miles
the distance which can be covered by Aubree's car on one gallon of gas =120/4 = 30 miles
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One day on her walk home from school, Leann noticed some rust on an old car.
She remembered that chemical equations can summarize what happens in a chemical reaction. What is the name of the two parts found on the left side of the equation below?
4 Fe + 3O2→ 2Fe2O3
A. products
B. reactants
C. scientific notation
D. synthesis
Answer:
B. reactants
The equilibrium concentrations for the reaction between SO2 and O2 to form
SO3 at a certain temperature are given in the table below. Determine the
equilibrium constant and whether the reaction favors reactants, products, or
neither at this temperature.
O₂(g) +2SO₂(g) 2SQ(g)
1.3 M
[0₂]
0.46 M
[s0₂]
A. K= 3.8 x 10-3; product favored
OB. K= 260; product favored
OC. K= 3.8 x 10-3; reactant favored
OD. K= 260; reactant favored
8.5 M
[S03]
K = 1.3104 based on the provided data and because K is high and positive, the reaction is in the product's favor.
What does the term "equilibrium" mean in chemistry?Equilibrium point is the condition where there is no overall change in the amount of either reactants or products throughout a reversible chemical reaction.
Given data :
O2(g) + 2SO2(g) ↔ 2SO3(g)
Concentration of O2 is [O2] = 0.024 M
Concentration of SO2 is [SO2] = 0.015 M
Concentration of SO3 is [SO3] = 0.26 M
Equilibrium constant, K =..?
Equilibrium constant for the given reaction is -
K = [SO3]² / [O2] [SO2]²
Putting the values of [SO3], [O2] and [SO2] the equilibrium constant, K become:
K = [SO3]² / [O2] [SO2]²
K = 0.26² / 0.024 × 0.015²
K = 1.3×10⁴
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