Q: A voltaic cell is constructed with a zinc electrode in $$\ce{$$ZnSO_4$$}$$ solution and a copper electrode in $$\ce{$$CuSO_4$$}$$ solution. The standard reduction potentials are $$E^\circ_{\ce{Zn$$^{2+}$$/Zn}} = -0.76 V $$and $$E^\circ_{\ce{Cu$$^{2+}$$/Cu}} = +0.34 V. $$What is the standard cell potential?

$$E^\circ_{\text{cell}} = +1.10\ \mathrm{V}$$

Question 1

A solution is prepared by dissolving 58.44 g of NaCl in enough water to make 1.00 L of solution. What is the molarity of the solution? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$$1.00\ \mathrm{M}$$

Question 2

Which of the following statements best describes a colligative property?

Accepted Answer

A property that depends only on the number of solute particles present, not their identity.

Question 3

A reaction is found to be first order in A and second order in B. What is the rate law for this reaction?

Accepted Answer

$$	ext{rate} = k[A][B]^2$$

Question 4

Which of the following changes will shift the equilibrium of the reaction $$\ce{N_2$(g) + 3H_2(g)  2NH_3(g)} to $$the right, according to Le Châtelier's Principle?

Accepted Answer

Removing ammonia ($$\ce{NH_3$}) as it $$forms.

Question 5

Which of the following is a strong acid?

Accepted Answer

$$\ce{HCl}$$

Question 6

A buffer solution is prepared by mixing equal concentrations of acetic acid ($$\ce{CH_3COOH}) $$and sodium acetate ($$\ce{CH_3COONa}). $$What will happen to the pH if a small amount of HCl is added?

Accepted Answer

The pH will decrease slightly.

Question 7

During a titration of 25.0 mL of 0.100 M $$\ce{HCl}$$ with 0.100 M $$\ce{NaOH}$$, what is the pH at the equivalence point?

Accepted Answer

pH = 7.00

Question 8

Which of the following best describes the second law of thermodynamics?

Accepted Answer

The entropy of the universe increases in any spontaneous process.

Question 9

For the reaction $$\ce{2H_2O_2(aq) -\u003e 2H_2O(l) + O_2$(g)}$$, $$\Delta H = -196 kJ $$and $$\Delta S = +125 J/K. At $$what temperature (in K) does the reaction become nonspontaneous?

Accepted Answer

$$T = 1568\ \mathrm{K}$$

Question 10

A voltaic cell is constructed with a zinc electrode in $$\ce{$$ZnSO_4$$}$$ solution and a copper electrode in $$\ce{$$CuSO_4$$}$$ solution. The standard reduction potentials are $$E^\circ_{\ce{Zn$$^{2+}$$/Zn}} = -0.76 V $$and $$E^\circ_{\ce{Cu$$^{2+}$$/Cu}} = +0.34 V. $$What is the standard cell potential?

Accepted Answer

$$E^\circ_{	ext{cell}} = +1.10\ \mathrm{V}$$

Question 11

Which of the following is a correct statement about the common ion effect?

Accepted Answer

Adding a common ion decreases the solubility of a salt.

Question 12

Which of the following best explains why ice floats on water?

Accepted Answer

Ice is less dense than liquid water because its molecules form an open hexagonal structure due to hydrogen bonding.

Question 13

Which of the following is the correct formula for the equilibrium constant $$K_c$$ for the reaction $$\ce{2NO_2(g)  N_2O_4(g)}$$?

Accepted Answer

$$K_c = \dfrac{[N_2O_4]}{[NO_2$]^2}$$

Question 14

A patient is given a saline IV solution that is hypotonic relative to their blood plasma. What is the most likely effect on the patient's red blood cells?

Accepted Answer

The cells will swell and may burst due to water entering the cells.

Question 15

Which of the following is a correct statement about transition metal complexes?

Accepted Answer

The color of a transition metal complex is due to d-d electron transitions.

Question 16

Which of the following functional groups is present in all amino acids?

Accepted Answer

A carboxyl group ($$-\ce{COOH}) $$and an amino group ($$-\ce{NH_2$})$$

Question 17

Which of the following best describes the role of DNA in living organisms?

Accepted Answer

DNA stores genetic information and directs the synthesis of proteins.

Question 18

Which of the following statements about polymers is correct?

Accepted Answer

Polymers are large molecules made by linking together many small repeating units called monomers.

Question 19

Which of the following best explains why increasing the temperature generally increases the rate of a chemical reaction?

Accepted Answer

Higher temperature increases the number of effective collisions between reactant molecules.

Question 20

Which of the following is a correct application of Le Châtelier's Principle in a real-world scenario?

Accepted Answer

Increasing the pressure in a closed soda bottle will cause more $$\ce{CO_2$} to $$dissolve in the liquid.

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