Practice Final Exam Review

A set of flashcards created to help review key concepts and information from the practice final exam.

What is the order of reaction if a plot of 1/[A]t versus time results in a straight line with a positive slope?

Second order reaction.

What is the coefficient of H2O in the balanced redox equation MnO4 - + SO3 2-  Mn2+ + SO4 2- in acidic solution?

4

What process leads to an increase in entropy?

Melting.

What is the equilibrium constant for the reaction Ni(CO)4(g) → Ni(s) + 4CO(g) if the equilibrium constant for the reverse reaction is 5.0 x 10^4?

2.0 x 10^-5.

What change will shift the equilibrium of 2NOBr(g) ⇌ 2NO(g) + Br2(g) to favor more products?

Adding more NO.

A Brønsted acid is a(n):

Proton donor.

Which of the following would be a buffer solution?

NH3 / NH4Cl.

Attractive forces between molecules that arise as a result of temporary dipoles induced in atoms or molecules are called:

Dispersion Forces.

What happens to the boiling point of water at a higher pressure than 1 atm?

The boiling point becomes higher than 100°C.

What is the equilibrium concentration of CO if the equilibrium constant Kc is 4.2 at 1650ºC with starting concentrations of 0.16 M H2 and 0.16 M CO2?

0.11 M.

What is the pH of a 0.40 M aqueous HC2H3O2 solution?

2.57.

What is the freezing point of a solution prepared from 50.0 g ethylene glycol and 85.0 g H2O?

-17.6°C.

Which choice describes the bonding in the molecule with 11 sigma (σ) and 2 pi (π) bonds?

11 sigma (σ) and 2 pi (π) bonds.

Identify the functional groups: amine, ester and ketone. What combination is correct?

C) amine, ester and ketone.

If the concentration of each reactant in the reaction between NO and I2 is tripled, what happens to the reaction rate?

It increases 18-fold.

What are the standard reduction potentials for Cr3+(aq) and Cu2+(aq)?

Cr3+(aq) + 3e– ---> Cr(s) –0.744 V; Cu2+(aq) + 2e– ---> Cu(s) 0.340 V.

Write the equilibrium expression for the ionization of phosphoric acid, H3PO4.

Ka = [H+][H2PO4-]/[H3PO4].

What should be used in a phosphate buffer with a pH of 7.00?

A mixture of H2PO4- and HPO42-.

Determine [H+] after adding 2.0 x 10^-3 mol of NaOH to a 0.10 M buffer solution.

The concentration of [H+] will slightly decrease due to the presence of the buffer.

What is the Lewis structure for each compound of xenon: XeF2, XeF4 and XeO3?

XeF2 is linear, XeF4 is square planar, XeO3 is trigonal pyramidal.

Calculate the ΔHf o of N2O5(g) given ΔH° = –55.1 kJ and ΔSo = –227 J·K–1.

Use the standard enthalpy and entropy changes to calculate ΔG and ΔHf.

Is the reaction 2NO2(g) + 1/2O2(g) ⇌ N2O5(g) spontaneous at 25 °C?

It is spontaneous because ΔG is negative.

What happens to Kp during an increase in temperature?

Kp would decrease.