1. Name the three particles of the atom and their respective charges are:
a.
b.
C.
the atom's
a protons
b neutrons
c electrons
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PLEASE HELP!!
Some organisms are able to carry out both cellular respiration and fermentation. Which process do you think is used more often?
Forensic scientists reliably provide exact times of death based on their analyses.
1. True
2. False
Answer:
The answer to this question would be: False
Explanation:
Using the initial concentration and volume values from Trial 1 of Table 1, fill in the following chart of new concentration values (in Molarity) for the following reactants:
Based on the volume and concentration of the solutions given;
Molarity of KBrO3 = 0.02 MMolarity of Na2S2O3 = 0.05 MMolarity of KBrO3 = 0.02 MMolarity of Na2S2O3 = 0.05 MWhat is molarity?Molarity of a solution is the concentration of the solution given as number of moles of solute in a given volume of solution in litres.
Molarity = number of moles/volume in LitresThe molarity of each of the solutes in the solution are as follows:
Flask A:
Total volume = 15 mL = 0.015 L
moles of KI = 0.01 M × 0.005 L = 0.00005 moles
moles of Na2S2O3 = 0.001 M × 0.005 = 0.000005 moles
Molarity of KI = 0.00005 moles/0.015 L
Molarity of KI = 0.0033 M
Molarity of Na2S2O3 = 0.000005 moles/0.015 L
Molarity of Na2S2O3 = 0.00033 M
Flask B:
Total volume = 10 mL = 0.001 L
moles of KBrO3 = 0.04 M × 0.005 L = 0.0002 moles
moles of HCl = 0.1 M × 0.005 = 0.0005 moles
Molarity of KBrO3 = 0.0002 moles/0.01 L
Molarity of KBrO3 = 0.02 M
Molarity of Na2S2O3 = 0.0005 moles/0.01 L Molarity of Na2S2O3 = 0.05 M
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According to Charles’s Law, what would happen to the volume (V) of an ideal gas when the absolute temperature (T) of gas increases by three-fold at pressure (P) and amount of gas (n).
Select one:
1)The volume of the gas decreases.
2)The final volume will be 1/3 of the initial volume.
3)The volume of the gas does not change.
4)The volume of the gas triples.
According to Charles' law, when the temperature of an ideal gas increases by three-fold at pressure (P), the volume of the gas also triples.
What is charles law?Charles law states that the volume of a given gas is directly proportional to the temperature provided that the pressure remains constant.
This is denoted by the following expression:
V1/T1 = V2/T2This means that as the volume increases, the temperature of the gas also increases and vice versa.
Therefore, when the temperature of an ideal gas increases by three-fold at pressure (P), the volume of the gas also triples.
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Chloride ion concentration in the fluid surrounding human cells is approximately 25 mM (millimolar). How many grams of NaCl must be dissolved in 1.00 L of solution to make a 25 mM NaCl(aq) solution?
1.461 grams of NaCl must be dissolved in 1 liter solution to make 25 mM of NaCl solution according to molar concentration.
What is molar concentration?
Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
Millimolar concentration is also calculated by the same formula just the difference in units is present. According to the data given and substitution in the formula,
mass= 25×58.44×1=1461 mg or 1.461 g
Thus, 1.461 g of sodium chloride is required to make 25 mM solution.
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Which of these has the greatest freezing point depression? Which of these has the greatest freezing point depression? Aqueous solution of NaCl (m = 0.01) Aqueous solution of CaCl2 (m = 0.01) Aqueous solution of C12H22O11 (m = 0.01) Pure water
The substance with the higher freezing point depression is CaCl2.
What is water's freezing point?Water freezes at 0° C in normal conditions but once water is mixed with other substances this temperature can change.
How does the freezing point change?As previously mentioned, the freezing point changes according to the substance water is mixed with, here are the changes for the listed substances:
Water with NaCl: -3.72 °CWater with CaCl2: -5.58 °C Water with C12H22O11 (Sucrose): -0.68 °C Pure water: No changesBased on this, the one that has the greatest freezing point depression is CaCl2.
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You have 16.0 g of some compound and you perform an experiment to remove all of the oxygen, 11.2 g of iron is left. What is the empirical formula of this compound?
The empirical formula of this compound is equal to [tex]Fe_{2}O_3[/tex].
Empirical formulaTo calculate the empirical formula of a compound, it is necessary to know the number of moles present.
Therefore, we will use the molar mass of iron and oxygen to find the amount of moles, so that:
[tex]MM_O = 16g/mol\\MM_Fe = 55.8g/mol[/tex]
[tex]MM = \frac{m}{mol}[/tex]
Oxygen[tex]16 = \frac{4.8}{mol}[/tex]
[tex]mol = 0.3[/tex]
Iron
[tex]55.8 = \frac{11.2}{mol}[/tex]
[tex]mol = 0.2[/tex]
Finally, as the empirical formula is composed of integers numbers of moles, just multiply the values by the smallest common factor to transform into an integer, so that:
O => [tex]0.3 \times 10 = 3moles[/tex]
Fe => [tex]0.2 \times 10 = 2moles[/tex]
So, the empirical formula of this compound is equal to [tex]Fe_{2}O_3[/tex]
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Balancing chemical equations
Answer:
2B2 + 3O2 → 2B2O3
Explanation:
Balance The Equation: B2 + O2 = B2O3
1. Label Each Compound With a Variable
aB2 + bO2 = cB2O3
2. Create a System of Equations, One Per Element
B: 2a + 0b = 2c
O: 0a + 2b = 3c
3. Solve For All Variables (using substitution, gauss elimination, or a calculator)
a = 2
b = 3
c = 2
4. Substitute Coefficients and Verify Result
2B2 + 3O2 = 2B2O3
L R
B: 4 4 ✔️
O: 6 6 ✔️
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Which component of the steam sterilizer is the coolest?
Answer:
Thermostatic valve
Explanation:
"Is located in the drain line; the drain and the area surrounding it are the coolest areas in the sterilizer. A sensor in the chamber drain measures steam temperature and automatically controls the flow of air and condensate from the sterilizing chamber."
Hope this helps
Which of the following is an indication of a chemical reaction?
freezing
melting
release of heat
all of the above
Answer:
All of the above
Explanation:
Their all chemical change
Gallium, Ga, is a low-melting metal that is used in semiconductors. It is atomic number 31. The
noble-gas notation for an atom of gallium in the ground state is shown below.
[Ar]4s23d104p1
What is the complete electron configuration for this atom?
Answer:
answer no.1
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p¹
Explanation:
if you are not sure..between 1st and 2nd just sum all the "exponents" and you should get the atomic number.. in this case 31.
A secondary step in the process to produce ultra-pure silicon is to combine silicon tetrachloride with magnesium. How many grams of Si could be produced by reacting 2.00 kg of SiCl4 with excess Mg
The mass of silicon, Si produced from the reaction is 329.41 g
Balanced equationSiCl₄ + 2Mg —> 2MgCl₂ + Si
Molar mass of SiCl₄ = 28 + (35.5×4) = 170 g/mol
Mass of SiCl₄ from the balanced equation = 1 × 170 = 170 g
Molar mass of Si = 28 g/mol
Mass of Si from the balanced equation = 1 × 28 = 28 g
From the balanced equation above,
170 g of SiCl₄ reacted to produce 28 g of Si.
How to determine the mass of Si producedFrom the balanced equation above,
170 g of SiCl₄ reacted to produce 28 g of Si.
Therefore,
2 Kg (i.e 2000 g) of SiCl₄ will react to produce = (2000 × 28) / 170 = 329.41 g of Si
Thus, 329.41 g of Si were obtained from the reaction
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What is the key factor in defining a reaction as an oxidation-reduction reaction?
transfer of electrons between atoms
oxygen as one of the reactants
making and breaking ionic bonds
precipitation of solid from the reaction solution
Answer:
Transfer of electrons between atoms
Explanation:
Just because it has the prefix "oxi" it doesn't necessarily mean that oxygen exists as a reactant.
Making and breaking ionic compounds happen right before or after redox reactions after the atoms or ions are modified into one another.
precipitation occurs during the redox rxns involved in electrolysis & daniel cells. but it is not a key factor.
Fill in the coefficients to balance the equation for the chemical reaction that occurs:
_NaCl(aq) + _AgNO3(aq) --> _AgCl(s) + _NaNO3
Answer:
The equation is balanced
Explanation:
NaCl (aq) + AgNO3(aq) ––> AgCl (s) + NaNO3 (aq)
NaCl (aq) + AgNO3 (aq)
Na = 1 , Cl=1 , Ag = 1 , No3= 1
AgCl (s) + NaNO3 (aq)
Ag = 1 , Cl=1 , Na = 1 , No3= 1
can guys help me to answer it
Calculate the wavelength of an electromagnetic wave with a frequency of 8.68 * 10 ^ 16 * H * z ; 5.0 * 10 ^ 14 * H * z and 1.00 * 10 ^ 6 * H * z .
Answer:
3.46 x 10^-9 m; 6.0 x 10^-7 m; 3.00 x 10^20 Hz
Explanation:
I'm not 100% sure abt the last one
The wavelength of the electromagnetic wave with frequencies of 8.68×10¹⁶ H z, 5.0 ×10¹⁴ Hz, and 1.00× 10⁶ Hz is equal to 3.45nm, 6.00 nm, and 30 nm respectively.
What are frequency and wavelength?The frequency of the electromagnetic wave can be described as the number of oscillations of an electromagnetic wave in one second. The frequency of a wave has S.I. units which are represented as per second or hertz.
The wavelength of the electromagnetic wave is the distance between the two adjacent points in phase w.r.t. each other.
The relationship between wavelength (λ), frequency, and speed of light (c) of electromagnetic waves are:
c = νλ
Given, the frequency of the wave, ν = 8.68×10¹⁶ Hz
The speed of light, [tex]c = 3\times10^8 m/s[/tex]
The wavelength of the electromagnetic waves can determine from the above-mentioned relationship:
λ = c/ν = 3×10⁸/8.68×10¹⁶ = 3.45 × 10⁻⁹ m. = 3.45 nm
Given, the frequency of the wave, ν = 5.0 ×10¹⁴ Hz
λ = c/ν = 3×10⁸/5.0 ×10¹⁴ Hz = 6 × 10⁻⁹ m. = 6.00 nm
Given, the frequency of the wave, ν = 1.00× 10⁶ Hz
λ = c/ν = 3×10⁸/1.00× 10⁶ Hz = 3.00 × 10⁻⁸ m. = 30 nm
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In some parts of the galaxy, electrons in hot hydrogen gas may be excited to very high quantum levels. Calculate the wavelength of light that would be emitted if electrons moved from the =20 shell to the =2 shell.
Lab 7 questions for disturbing equilibrium
1. What is the color of bromosphenol blue in an acid? In a base?
2. How did you get the solution to change from blue to yellow?
3. Why did the solution change from blue to yellow (what chemical reaction happened?)
4. How did you get the solution to change from yellow to blue?
5. Why did the solution change from yellow to blue (what chemical reaction happened?)
6. After procedure step 3 the solution in well A1 was in equilibrium. what happened to the solution in well A1 during procedure step 5? did the equilibrium shift?
Based on the nature of the indicator Bromophenol blue,
it is yellow in an acid and blue in a base.Adding an acid will change the blue colour to yellow.On addition of an acid, hydrogen ion concentration increases, equilibrium shifts towards removal of excess hydrogen ions and the solution will turn yellow.The solution can be made to change from yellow to blue by addition of base.On addition of a base, hydroxide ion concentration increases, equilibrium shifts towards removal of excess hydroxide ions and the solution will turn blue.equilibrium shifts towards removal of excess hydroxide ions.What is an indicator?An indicator is a organic dye which changes colour according to the pH of the medium it is present in.
Examples of indicators include:
Methyl OrangeMethyl redBromophenol blueBromophenol blue is an acid–base indicator whose range of colour change lies between pH 3.0 and 4.6.
It changes from yellow at pH 3.0 to blue at pH 4.6.
Bromophenol is yellow in an acid and blue in a base.Adding an acid will change a blue colour of bromophenol in a basic solution to yellow.On addition of an acid, hydrogen ion concentration increases, equilibrium shifts towards removal of excess hydrogen ions and the solution will turn yellow.The solution can be made to change from yellow to blue by addition of base.On addition of a base, hydroxide ion concentration increases, equilibrium shifts towards removal of excess hydroxide ions and the solution will turn blue.When hydroxide ion is added to the solution in step 3, equilibrium shifts towards removal of excess hydroxide ions.Therefore, Bromophenol blue is a useful indicator between pH range 3.5 ⇌ 4.6.
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Answer:
1. It is blue in a base and yellow in an acid
2. Additional acid will change the blue color into a yellow color.
3. The acid included has hydrogen ions that provide concentration that increases and makes the equilibrium shift towards it which removes the excess hydrogen ions and causes the solution to become yellow.
4. The addition of the base causes the yellow to go to a blue color.
5. Hydroxide ion concentration means the solution will become blue as well.
6. The equilibrium will become blue since it has th reoccurring change at the end of the lab.
Explanation:
Hope this helps, have a great summer!
DIFFERENCE BETWEEN LOWEST AND HIGHEST MELTING POINT OOF CARBON FIBRE
Answer:
The carbon fiber itself will withstand incredibly high temps. The weak point will be the epoxies or the resins.Ambient-cured epoxies will typically begin breaking down around 100 °C. The heat-cured epoxies that will go up to around 300 °C. As you get into the high temp ratings, the epoxies get trickier to handle, install, cure.Since the compositions of most irons while casting are around the eutectic point (lowest liquid point) of the iron–carbon system, the melting temperatures usually range from 1,150 to 1,200 °C.As is evident, at such high temperatures, the epoxies of Carbon Fibers will melt. So, they are not yet used for iron casting.
How to compare and contrast chemical and physical changes
Answer:
To compare chemical and physical changes you need to:
- Identify the definition for a chemical change
- Identify the definition for physical change
- State simalrities between chemical and physical changes (comparing)
- State the differences between chemical and physical changes (contrasting)
- Give an example of a chemical change
- Give an example of a physical change
Explanation:
This is how I would answer a question like this in an exam. The definitions and examples are not needed but show your understanding and also earn you extra marks in an exam.
Mrs. Allex kicks a beach ball. What is the action? What is the reaction?
Answer:
The action is acceleration and the reaction is friction
Write balanced equations for the reactions that occur when Glucose (C6H12O6) reacts with oxygen gas to produce gaseous carbon dioxide and
water vapour.
C6H12O6 + 6O2 ==> 6CO2 + 6H2O
kind of out of topic:
oxygen is usually represented as O2 since its diatomic
An ideal gas sample occupies 1.50 L at 25.0 o C and 741 mm Hg. How many moles are there in the sample
Ideal gas law is valid only for ideal gas not for vanderwaal gas. There are so many laws that are deduced from ideal gas equation. There are 0.05mole in the sample occupies 1.50 L at 25.0 o C and 741 mm Hg.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
P×V=n×R×T
where,
P = pressure of ideal gas= 741 mm Hg= 0.97 atm
V= volume of ideal gas =1.50 L
n =number of moles of ideal gas
T =temperature of ideal gas =25°C =298K
R = Gas constant = 0.0821 L.atm/K.mol
substituting the values
P×V=n×R×T
0.97 atm ×1.50 L=n×0.0821 ×298
number of moles of ideal gas =0.05mole
Therefore, there are 0.05mole in the sample occupies 1.50 L at 25.0 o C and 741 mm Hg.
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explain how would find the solubility of a solute
Answer:
Solubility indicates the maximum amount of substance that can be dissolved in a solvent at a particular temperature. Such a solution is called saturation. Divide the mass of the compound by the mass of the solvent, multiply by 100 g, and calculate the solubility in g / 100 g.
Explanation:
How many moles of NaCL are present in 600mL of a 1.55 M NaCL solution?
Answer:
1000 ml - 1.55M 600 ml - x X 600*1.55/1000=0.93 M
What happens to the density of earth's interior as you travel from the crust to the core
A chemist has to prepare 250.0 mL of a 0.300 M Na2SO4(aq) solution. What mass, in grams, of sodium sulfate (formula mass 142.05 g/mol) would they use
The mass of sodium sulphate, Na₂SO₄, required to prepare the solution is 10.65 g
How to determine the mole of sodium sulphate Na₂SO₄Volume = 250 mL = 250 / 1000 = 0.25 LMolarity = 0.3 MMole of Na₂SO₄ =?Mole = Molarity x Volume
Mole of Na₂SO₄ = 0.3 × 0.25
Mole of Na₂SO₄ = 0.075 mole
How to determine the mass of sodium sulphate Na₂SO₄Molar mass of Na₂SO₄ = 142.05 g/mol Mole of Na₂SO₄ = 0.075 mole Mass of Na₂SO₄ =?Mass = mole × molar mass
Mass of Na₂SO₄ = 0.075 × 142.05
Mass of Na₂SO₄ = 10.65 g
Thus, 10.65 g of Na₂SO₄ is needed to prepare the solution.
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Are any of these equations redox reactions? if so what are their reducing and oxidizing agents?
7O2(g)+2CH3CH3(g)→4CO2(g)+6H2O(g)
HSO-4(aq)+OH-(aq)→SO42-(aq)+H2O(l)
Fe(s)+CuSO4→FeSO4(aq)+Cu(s)
Yes, Fe(s)+CuSO4→FeSO4(aq)+Cu(s) is a redox reaction. The reducing agent is Fe(s), while the oxidizing agent is CuSO4.
Oxidation-reduction reaction (redox)Oxidation-reduction reaction is the type of reaction in which electrons are transferred from one element to another. A compound or an element either gains are looses an electron in redox reactions.
Fe(s)+CuSO4→FeSO4(aq)+Cu(s)
From the equation above, Fe(s) is the reducing agent because it gives away 2 electrons and undergoes oxidation reaction.
From the equation above, CuSO4 is an oxidizing agent because it gives oxygen to Fe(s) and undergoes a reduction reaction.
Therefore, the reducing agent is Fe(s), while the oxidizing agent is CuSO4.
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is magnesium oxide a metal
Answer:
Magnesia, or magnesium oxide, is a mineral composed of alkaline earth metals. The majority of today's magnesium oxide comes from calcining natural minerals.
Explanation:
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