Answer:
true
Explanation:
Adhesion is the attraction of molecules of one kind for molecules of a different kind
Which of the following biogeochemical cycles uses the reaction 2N2 + 6H2O --> 4NH3 + 3O2? (3 points) The phosphorus cycle The carbon cycle The water cycle The nitrogen cycle
Answer:
The nitrogen cycle
Explanation:
The nitrogen cycle is the process in which nitrogen (N₂) is converted to a biologically useful species (ammonia, NH₃).
We can also discard the other options given by the problem:
There is no phosphorus nor carbon in the reaction.The water cycle involves water changing phases (tipically from gas to liquid to gas again), instead of reacting and producing oxygen.what is the frequency of an electromagnetic wave that has a wavelength of 4.55x10-3m
Answer:
hnjilbglu
Explanation:
nbjl,bhuk
To measure the amount of calcium carbonate in a seashell, an analytical chemist crushes a sample of the shell to a fine powder and titrates it to the endpoint with of hydrogen chloride solution. The balanced chemical equation for the reaction is:
The given question is complete, the complete question is:
To measure the amount of calcium carbonate (CaCO) in a seashell, an analytical chemist crushes a 4.80 g sample of the shell to a fine powder and titrates it to the endpoint with 515. mL of 0.140 M hydrogen chloride (HCl) solution. The balanced chemical equation for the reaction is: 2HCI(a)Co (a) H2Co,(aq) + 2Cl (aq)
What kind of reaction is this?
If you said this was a precipitation reaction, enter the chemical formula of the precipitate.
If you said this was an acid-base reaction, enter the chemical formula of the reactant that is acting as the base.
If you said this was a redox reaction, enter the chemical symbol of the element that is oxidized
Calculate the mass percent of CaCO in the sample. Be sure your answer has the correct number of significant digits.
Answer:
It is an acid-base reaction and the mass percent of CaCo3 is 75.2%.
Explanation:
A chemical reaction in which an insoluble salt produces from two soluble salts is termed as precipitation reaction.
A reaction in which atleast exchange of one proton takes place between the two species is termed as an acid-base reaction.
A reaction in which any of the element has a change in oxidation state is termed as redox reaction.
In the mentioned reaction, there is a transfer of H⁺, no precipitation is forming, and no change in oxidation state taking place, thus, it is an acid-base reaction.
In the acid-base reaction, the base refers to the species that accepts hydrogen ion or proton. In the given case, CO₃²⁻ is accepting H+ ion to become H₂CO₃. Hence, CO₃²⁻ is the base.
In order to calculate mass percent of CaCO₃, first there is a need to find the moles of HCl reacted for a solution,
Moles = Molarity × Volume (L)
Moles = 0.140 mol/L × 515 × 10⁻³ L
Moles = 0.0721 mol
Now from the balanced equation, one mole of CaCO₃ needs two moles of HCl.
So, moles of CaCO₃ reacted will be,
= 1/2 × 0.0721 = 0.03605 mol
The mass of calcium carbonate taking part in reaction will be,
= Moles × Molar mass
= 0.03605 × 100 gram/mole
= 3.6086 gram
Mass% of CaCO₃ = Mass of CaCO₃/Mass of sample × 100
= 3.6086 grams/4.80 grams × 100
Mass % = 75.2%
A 3.74-L cylinder contains 4.17 g of methane, CH4, at a pressure of 3020 mmHg. What is the temperature of the gas
Answer:
T = 694 K
Explanation:
Given the following data:
V= 3.74 L
mass = m = 4.17 g
P = 3020 mmHg x 1 atm/760 mmHg= 3.97 atm
We use the ideal gases equation to calculate the temperature (T):
PV= nRT ⇒ T= PV/nR
We calculate n (number of moles of methane gas) by dividing the mass into the molar mass of methane (CH₄):
molar mass(CH₄) = MM = (1 x 12 g/mol)+ (4 x 1 g/mol) = 16 g/mol
n = m/MM= 4.17 g/(16 g/mol)= 0.261 mol
Finally, we calculate T:
T= PV/nR = (3.97 atm x 3.74 L)/(0.261 mol x 0.082 L.atm/K.mol) = 694 K
Testbank, Question 095 What is the expected major organic product from the treatment of 4-methyl-2-pentyne with excess hydrogen in the presence of a platinum catalyst
Answer:
See explanation and image attached
Explanation:
The addition of excess hydrogen to alkyne in the presence of a platinum catalyst leads to complete hydrogenation of the alkyne as shown in the image attached.
Therefore, an alkane is obtained as the major organic product when excess hydrogen reacts with an alkyne in the presence of a platinum catalyst.
Make at least 3 observations that compare the Polonium nucleus before and after it decays?
Answer:
Observations
The Polonium nucleus disintegrates to form a stable Lead nucleus with the emission of an alpha particle.The mass number of the original Polonium nucleus decreases by 4 ( ie from 210 to 206)The atomic number of the original Polonium nucleus decreases by 2 (ie from 84 to 82)Explanation:
Polonium (Po) is a radioactive silver-grey material that exists in very low concentrations as a solid in the environment.
As a radioactive substance, it is unstable and then it undergoes radioactive alpha decay to form a stable chemical element - Lead (Pb)
Polonium Nucleus before decay
Polonium (²¹⁰₈₄Po) has a mass number of 210 and an atomic number of 84. The atomic number tells us that Polonium has 84 protons in its nucleus before it undergoes decay.
The mass number tell us that Polomium has 126 neutrons in addition to the 84 protons in its nucleus
The total number of protons and neutrons in a nucleus make up its Mass Number
Polonium Nucleus after decay
Polonium undergoes radioactive decay by emitting an alpha particle, which is also known as a Helium particle (⁴₂He)
²¹⁰ ₈₄Po ⇒ ²⁰⁶ ₈₂Pb + ⁴₂He
Observations
The Polonium nucleus disintegrates to form a stable Lead nucleus with the emission of an alpha particleThe mass number of the original Polonium nucleus reduces by 4 ( ie from 210 to 206)The atomic number of the original Polonium nucleus decreases by 2 (ie from 84 to 82)A new stable element (Lead) is formed.An alpha particle (⁴₂He) is released.How would I find the number of protons, neutrons and electrons when I only have the atomic number and atom (assignment says assume the net charge is 0)
Explanation:
Atomic number , protons and electrons have the same value / their value is same .
But for the neutron there is no specific technique. You have to remember the neutrons of every element
How many moles of H atoms are there in 2 moles of CH3CH2CH2CH3?
AnSweR: 10
ExplanAtion: My random idiot friend just told me
Genchemium, a hypothetical metal with a atomic mass of 150 g/mol, has a body-centered (bcc) cubic unit cell and a density of 1.93 g/cm3. What is the edge length (in pm) of genchemium
Answer:
edge length a = 636.7 pm
Explanation:
If you check the image below, you would see that there is a technical error that makes it unable to submit the answer, but to curb that effect, I have attached the screenshot of my answer showing how explained it by using the text-editor.
Thanks!
The edge length (in pm) of the hypothetical metal genchemium is;
a = 0.6367 pm
We are given;
Atomic mass; M = 150 g/mol
Density; ρ = 1.96 g/cm³
This is a BCC structure and as such formula to find the edge length is;
ρ = (z × M)/(N × a³)
where;
z = number of atoms available in each unit cell = 2 atoms
M is atomic mass
N is avogadro's number = 6.023 × 10²³ mols
a is edge length
Thus, making a the subject gives;
a = ∛(z × M)/(N × ρ)
Plugging in the relevant values;
a = ∛(2 × 150)/(6.023 × 10²³ × 1.96)
a = 63.67 × 10⁻⁹ cm
converting to meters gives;
a = 0.6367 × 10⁻⁹ m
converting to pm gives;
a = 0.6367 pm
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Worldwide, scientists are working on different options for clean energy to replace the burning of fossil fuels. One option that could potentially be successful is the use of hydrogen gas. This gas can be generated through a reaction between carbon and water L C(s) 2H20(g) -CO2(g) + 2H2(g) AH = ? 1) CO2(g) C(s) + O2(g) AH = 393.5 KJ 2) 2H2O(g) 2H2(g) + O2(g) AH = 483.6 KJ Based on what you have learned in this lab, use the chemical equation and Hess's law to detecoaine the heat.offormationandis.this.aaction.is.Yothermic.or.andotberoic MG 2291 pg IMG 2290 jpo cocx (8).ddocx ChartGo (2) png 199+ Based on what you have learned in this lab, use the chemical equation and Hess's law to determine the heat of formation and if this reaction is exothermic or endothermic. T' T. 0 Words Check Answer Next ChartGo (2) pr dock (8).docx IMG 2290jpg IMG 2291 jpg
Answer:
H1 + H2 = -393.5 KJ + 483.6 KJ = 90.1 KJ
Explanation:
Equation 1 must be changed to C(s) + O2 (g) --> CO2 (g) H1 = -393.5 KJ
Equation 2 is in the correct order.
2H2O --> 2H2(g) + O2(g) H2 = 483.6 KJ
Adding the two equations together cancels out the oxygen in equation 1 and 2 to give the desired reaction equation.
H1 + H2 = -393.5 KJ + 483.6 KJ = 90.1 KJ
This means the heat of formation for this reaction gives a positive enthalpy, which makes this reaction endothermic.
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, 90.1 KJ is the total enthalpy.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances. Internal energy is the sum of all kinds of energy that the particles of a matter can possess, for example translational energy. Rotational energy.
Equation 1 C(s) + O[tex]_2[/tex] (g) [tex]\rightarrow[/tex]CO[tex]_2[/tex] (g) H₁= -393.5 KJ
Equation 2 2H[tex]_2[/tex]O [tex]\rightarrow[/tex]2H[tex]_2[/tex](g) + O[tex]_2[/tex](g) H₂ = 483.6 KJ
Adding the two equations together cancels out the oxygen in equation 1 and 2 to give the desired reaction equation.
H₁ + H₂ = -393.5 KJ + 483.6 KJ
H = 90.1 KJ
This means the heat of formation for this reaction gives a positive enthalpy, which makes this reaction endothermic.
Therefore, 90.1 KJ is the total enthalpy.
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Which of the following would be a clue that a rock is sedimentary?
Answer:
no
Explanation:
What types of structures do you see inside of the ovary?
Answer:
medulla and iuter cortext
Explanation:
Answer:
I see an iuter cortext and a medulla
I hope this helps
Give the IUPAC name for the following molecule.
Answer:
The IUPAC name is:
4-methyl pentanoic acid
Explanation:
4-Methylpentanoic acid is actually a carboxylic acid. It has five carbons and there is a methyl substitution which is at the fourth carbon.
Molecular Formula: [tex]C_{6}H_{12}O_{2}[/tex]
The acid is known to be a metabolite of 20 alpha-hydroxyl cholesterol. From the excerpt, the acid is a branched-chain and also known as a saturated fatty acid. It is known to be a conjugate acid of an isocaproate.
Other names for the acid are also called 4-methylvaleric acid or isocaproic acid.
What best defines a population
Answer:
A number of organisms in a specific area/place
Explanation:
What do scientists measure when determining the absolute age of a rock?
The Haber process which is used to produce ammonia for fertilizercombines hydrogen
and nitrogen under high pressure. The equation is shown below:
N, + 3H. = 2NH
70.2 mol
An industrial chemist mixes 105.3 mol
of H, and 56.2 mol of N. in a Haber
process reactor. How many moles of
ammonia will form?
105.3 mol
56.2 mol
35.1 mol
Answer:
Number of moles of ammonia formed = 70.2 mol
Explanation:
Given data:
Number of moles of H₂ = 105.3 mol
Number of moles of N₂ = 56.2 mol
Number of moles of ammonia formed = ?
Solution:
N₂ + 3H₂ → 2NH₃
Now we will compare the moles of ammonia with both reactant.
H₂ : NH₃
3 : 2
105.3 : 2/3×1.05.3 = 70.2 mol
N₂ : NH₃
1 : 2
56.2 : 2×56.2 = 112.4mol
Where is most of Earth’s fresh water found?
in the ground
near the poles
in lakes and streams
in the air as water vapor
Answer:
i believe it is in the ground
Answer:
gound
Explanation:
What is and ionic bond and how it forms and why it forms
Compare and contrast lithium and potassium and also fluorine !!!??? Pls need help
lithium and potassium are both in the alkali family and they are metals. Fluorine is a non-metal and lives in the halogens family. But, each of them have 2 valence electrons in the innermost ring
a 125 torr mixture of c2h4(g) and c3hg(g) at a given temperature was burned in excess oxygen in a rigid, sealed container. the product c02( g) was collected under the same initial reaction conditions and determined to be 280 torr. what was the mole fraction of c2h4(g) in the original mixture
Answer:
0.24
Explanation:
C2H4(g) + 3O2(g) ------> 2CO2(g) + 2H2O(g)
C3 H8 (g) + 5O2 (g) → 3CO2(g) +4H2 O(g)
Initially,
PV=nRT
125×V=(a+b)RT .....(i)
After combustion, pressure is due to the total moles of CO2
280×V=(3a+2b)RT .....(ii)
Dividing equation ii by i
280/125 = 3a+2b/a+b
2.24 = 3a+2b/a+b
2.24a + 2.24b =3a+2b
2.24b - 2b = 3a - 2.24a
0.24b = 0.76a
b= 3.2a
mole fraction of C3H8 = a/a + b = a/a + 3.2a = 1/4.2 = 0.24
Untitled Section
Which of the following is not a physical change? *
10
A. crushing
B. sublimation
C. rotting
D. deposition
Next
Page 29
Answer:
B.
Explanation:
Hope this helps.
What criteria does this mixture have to satisfy to be separated by simple or fractional distillation
Hi, the given question is incomplete, the complete question is:
You carry out a reaction that yields a major product Q (boiling point: 120°C) and side product R (boiling point: 150°C). The ratio of Q to R is 70:30. Both Q and Rare liquids.
After the ethyl acetate is evaporated, Q and R (a mixture of liquids) remain. What criteria does this mixture have to satisfy to be separated by simple or fractional distillation (besides bp difference and composition)?
Answer:
The basic criteria are that the two liquids should be miscible. A mixture of two miscible liquids is further separated by the process of simple distillation and fractional distillation. For the liquids that exhibit varied boiling points, with a difference of +30 degrees C, the process of simple distillation is used. On the other hand, for the liquids whose boiling points come between the range of o to 30 degrees C, the process of fractional distillation is used.
A student applied a force of 200 N to push a box 15 m down the sidewalk. Given the formula. W = F xd, how much work has
been done?
O 30 J
Answer:
3,000 J
W = f x d
W = 200 x 15
W = 3,000 J
Which Atom is most likely to form a metallic bond
Answer:
aluminium
Explanation:
When an atom makes a transition from a higher energy level to a lower one, a photon is released. What is the wavelength of the photon that is emitted from the atom during the transition?
Answer:
Depends on different states.
Explanation:
The wavelength of the photon that is emitted from the atom during the transition depends on the transition from different states. If the photon is emitted from n=4 state to n=3 state, the wavelength of photon is 1875 while on the other hand, if the photon is emitted from n=5 state to n=3 state, the wavelength of photon is 1282. If the photon is emitted from n=3 state to n=2 state, the wavelength of photon is 656.
Strontium compounds are often used in flares because their flame color is bright red. One industrial process to produce low-solubility strontiun) compounds (that are less affected by getting wet) involves the reaction of aqueous solutions of strontium nitrate and sodium carbonate. Write the balanced molecular equation, the total ionic equation and the net ionic equation for this reaction.
Answer:
Sr(NO3)2 + Na2CO3 --------> SrCO3 + 2NaNO3
Total ionic equation;
Sr^2+ + NO3^- + Na^+ + CO3^2- -----> SrCO3 + 2NaNO3
Net ionic equation;
Sr^2+ + CO3^2- -----> SrCO3
Explanation:
The molecular equation shows the reactions of the compounds to give the products. It shows the molecular formula of reactants and products.
The total ionic equation shows the ions that recombine to form the products of the reaction.
The net ionic shows the major ionic reaction that took place in the system.
Hence, the net ionic equation explicitly shows the major species that are involved in a reaction, while a complete ionic equation includes the spectator ions.
Balanced chemical equation:
[tex]Sr(NO_3)_2 + Na_2CO_3 --> SrCO_3 + 2NaNO_3[/tex]
Total ionic equation:
[tex]Sr^{2+} + NO_3^{-} + Na^+ + CO_3^{2-} --> SrCO_3 + 2NaNO_3[/tex]
Net ionic equation:
[tex]Sr^{2+} + CO_3^{2-} --> SrCO_3[/tex]
The balanced molecular equation shows the reactions of the compounds to give the products. It shows the molecular formula of reactants and products. The total ionic equation shows the ions that recombine to form the products of the reaction. The net ionic shows the major ionic reaction that took place in the system.Learn more:
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Would changing the physical property of a substance will create a new substance
true or false
Answer:
True
Explanation:
is pH used to classify compounds?
Answer:
The pH scale is used to rank solutions in terms of how acidic or how basic they are. It indicates the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in a solution. ... This pH value of 7 is important because it indicates a neutral solution. All other substances are compared to this neutral point.
I hope I have helped :)
Which the following statement ia correct for the equation shown here
Which energy transformation occurs when you strike (light) a match?
Answer/Explanation:
Mechanical Energy to Thermal Energy
When you strike a match, it moves through the air until it rubs against a surface. The rubbing produces the heat required to light the match. This is a transformation from mechanical energy to thermal (heat) energy.
Energy transformation which occurs when a matchstick is lighted is that mechanical energy is converted to thermal energy.
What is thermal energy?
Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.
Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.
These vibrating molecules and atoms collide and as a result of which heat is generated in a substance , more the collision of particles , higher is the thermal energy.
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