it has been said that producing oil is less destructive to the environment than producing coal , explain the reasoning behind the claim ? (type here please in simple language)

Determine the rate constant at 10 degrees C? If a reaction mixture is 0.160 M in C2H5Br, and 0.260 M in OH−, what is the initial rate of the reaction at 85 ∘C ? The kinetics of the following second-order reaction were studied as a function of temperature:
C2H5Br(aq)+OH−(aq)→C2H5OH(l)+Br−(aq)

A 10.010.0 mL sample of whiskey was diluted to 500.0 mL. A 4.004.00 mL aliquot of the diluted sample was removed and the ethanol, C2H5OHC2H5OH , was distilled into 50.00 mL of 0.022500.02250 M K2Cr2O7K2Cr2O7 and oxidized to acetic acid.

3C2H5OH+2Cr2O2−7+16H+⟶4Cr3++3CH3COOH+11H2O3C2H5OH+2Cr2O72−+16H+⟶4Cr3++3CH3COOH+11H2O

The excess Cr2O2−7Cr2O72− was then back titrated with 23.523.5 mL of 0.13300.1330 M Fe2+Fe2+ , producing Cr3+Cr3+ and Fe3+Fe3+ . Calculate the weight per volume percent (% w/v) of ethanol in the original whiskey sample.

Propose a reaction scheme for the synthesis of hyperbranched polyamide, in which there is no possibility of gelation. What are the reaction characteristics, which would affect the molar mass of the polymer.

Describe the structure of a steroid. Be detailed.

Determine the pH at the equivalence (stoichiometric) point in the titration of 48 mL of 0.29 M CH₃NH₂(aq) with 0.19 M HCl(aq). The K_b of methylamineis 3.6 x 10^-4.

21. Why does fat accumulate in the liver due to alcohol consumption? Select all that apply.

A. The accumulation of FADH2 activates fatty acid synthesis in the liver

B. The accumulation of NADH and inhibition of gluconeogenesis activate fatty acid synthesis in the liver

C. Excess glycogenolysis in the liver

D. The inhibition of gluconeogenesis activates fatty acid degradation in the liver

E. The accumulation of glucose in the liver leads to fatty acid synthesis

Please explain

Calculate the pH during the titration of 20.00 mL of 0.1000 M C2H5COOH(aq) with 0.1000 M KOH(aq) after 19.9 mL of the base have been added. Ka of propanoic acid = 1.3 x 10-5.

What are the essential features of the following type of ionization mode used in mass spectrometry? Include whether it is a hard or soft process and what are the main benefits and/or limitations.

a) Ramped or “Smart Fragmentation” (i mostly need this one)

b) chemical ionization

c) Atmospheric pressure chemical ionization

Calculate the pH for each of the following cases in the titration of of 100.0 mL of 0.180 M HClO(aq) with 0.180 M KOH(aq). The ionization constant for HClO is 4.0x10^-8

A. After 50.0 mL of KOH, pH=?

B. After the addition of 130.0 mL of KOH, pH=?

What details should be noted when measuring sample with Gel Permeation Chromatography?

Btw, Merry X-Mas !!

1) Van der Waals forces include both attractive and repulsive components.

Select one:

True False

2) Like Coulombic forces, van der Waals forces show a distance dependence .

Select one:

True False

3) The weakest hydrogen bonds have O-H...O bond angles of 180 degree.

Select one:

True False

4) Which intermolecular force has the longest range?

Select one:

a. monopole-monopole

b. monopole-dipole

c. monopole-induced dipole

d. dipole-induced dipole

e. dipole-dipole

5) Why is it easier to remove 2s electron from Li compared to a 1s electron?

Select one:

a. The 2s electrons feel greater Coulombic repulsion from the nucleus.

b. In part, because the radical extent of the 1s orbital is greater than thatof the 2s orbital.

c. The 1s orbital is higher in energy than the 2s orbital.

d. In part, because the 1s electrons shieldthe 2s electrons from Coulombic attraction to the nucleus.

6. Provide a rationale for why n-octane (linear compound) has a boiling point of 126 degree C whereas branched isomer 2,2,3,3-tetramethylbutane has a melting point of 107 degree C. Your answer should also include a mention of symmetry and point groups.

7) Is the distance dependence for a permanent dipole-permanent dipole interaction always 1/r^3 ? Justify your answer.

8) Match the potential energy distance dependence with the intermolecular force described

Monopole-permanent dipole 1/r^2

induced dipole-induced dipole 1/r

Permanent dipole-permanent dipole (fixed) 1/r^6

Dipole-induced dipole 1/r^3

monopole-monopole 1/r^4

Monopole-induced dipole

Based on the color of the solutions, determine the direction of the reaction equilibrium shift upon addition of each reagent investigated and write the chemical reaction involving the reagent that is responsible for the shift. Each of the following reagents was added to FeSCN2+ (aq) and the color change is indicated. I'm not sure of the product side of each reaction, please help.

a) Fe(NO3) + FeSCN2+ turned from red to dark red (This one might not have an equation)

b) NH4SCN + FeSCN2+ red turned black

c) SnCl2 + FeSCN2+ red turned cloudy orange

d) AgNO3 + FeSCN2+ red turned cloudy white

e) NaCl + FeSCN2+ red turned orange

f) NaOH + FeSCN2+ red turned dark yellow

g) Na2HPO4 + FeSCN2 red turned clear

1-A solution has a temperature change of 20 K. What is the temperature change in degree Celsius?

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Question 2

Students used two thermometers in Thermo lab. If both thermometers consistently read temperature exactly 1.0 degree higher than the actual temperature, how does this affect the experimental molar heat of neutralization?

Question 3

Specific heat capacity of water is 4.184 J/(g C). What is its molar heat capacity?

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Question 4

50.0 mL of 2.00 mol/L HNO3 solution and 50.0 mL of 1.00 mol/L NaOH solution, both at 20.0 degree Celsius, were mixed in a calorimeter. Calculate the molar heat of neutralization of HNO3 in kJ/mol if:

(1) final temperature was 27.2 degree Celsius;

(2) the mass of the overall solution was 102.0 g;

(3) the heat capacity of the calorimeter was 25.0 J/C;

(4) and assume that the specific heat of solution is the same as water, 4.184 J/(g C);

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Question 5

A solution of X was mixed with a solution of Y to react. Both X and Y were at the same initial temperature. However, after the reaction, the combined solution got much hotter. Which one is correct about this reaction between X and Y?

Question 6

The lines observed in H-lamp are parts of Balmer Series. All these lines are due to a transition from various higher n value to a common n. What is this common lower n value for all these lines? (Hint: the information can be found around "Calculations" area on page 8-67)

Question 7

Red and purple are two lines of hydrogen lamp. Which one is correct when comparing these two lines? Choose all that apply.

Question 8

Since we can only see visible lines from a hydrogen lamp, hydrogen lamp does not produce any UV light.

Question 9

Evaporation of water.........

Question 10

Which of the following transition in a hydrogen atom will end up releasing the highest amount of energy?

Can someone explain to me the difference between atomic mass, mass number, and atomic weight.

I have 4 different textbooks saying different things and I am so confused.

Is atomic mass and mass number the same thing? Or is atomic mass and atomic weight the same thing? Or are all three terms different things with different meanings?

Can someone please clarify in simple terms the meaning of these three terms and give an example for each, thanks so much! I am studying for the MCAT and would really appreciate the help!