the chem test from hell

Which of the following statements is false

When solvent-solute interactions are strong, non ideal solutions that contain volatile solute’s show a positive deviation from raoult’s law

The follow solutions are prepared with an equal mass of each compound in 1L of water, rank their freezing points

i. Surcose in 1L of water (C12 H12 O11)

ii. Glucose in 1L of water (C6 H12 O6)

iii. fructose in 1L of water (C6 H12 O6)

iii = ii < 1

The vapor pressure of a solution containing a nonvolatile solute is directly proportional to the

Mole fraction of the solvent

Given the following rate law, how does the rate of reaction change if the concentration of both X and Y are doubled?

Rate = k[X][Y']2

The rate of reaction will increase by a factor of 8

Which statement is true regarding the function of a catalyst in a chemical reaction

All of the above

All the above

Which of the following would produce reactions with faster rates of reaction, make your comparison assuming all other variables are constant except for the one given

i. lower activation energy

ii. greater frequency of collisions between molecules

iii. greater number of orientations for effective collisions

iv. higher temperature

All of the above

Two liquids are mixed and form strong intermolecular attractions between their molecules, resulting in a negativity enthalpy of solution, how does the pressure above the solution compare to the predicted raoults law

It will be less than the pressure predicted by raoult’s law

Milk is not a solution, it is a type of colloid called an emulsion, which of the following best describes a colloid

A heterogenous mixture with solute particles evenly distributed throughout another substance

which of the following factors when increased most likely lead to an increase in the rate of a chemical reaction

The temperature of a reaction system

Which of the following statements is true according to collision theory

Molecules must collide in a specific orientation to lead to a reaction

A catalyst alters the rate of a reaction by

Providing an alternate pathway which has a lower activation energy

What is true about a system in a chemical equilibrium

A and B are true

A reaction has the following reaction profile. Based only on the given reaction profile, what can you say about the reaction

i. Step 3 is the rate determining step

ii. The reaction is exothermic.

iii. Step 2 is unimolecular

i only

identify the equilibrium constant expression (Kc) for the reaction

UO2(s) + 4HF(g) → UF4(g) + 2H2O(g)

←

[Uf4] [H2O]2 / [Hf]4

Which of the following reactions is the reactant favored?

l. 2NO + Cl 2 → 2NoCl K = 58.8
←

ll. 2NO2 → N2O4 K = 6.7 × 10^-4
←

lll. 2SO2 + O2 → 2SO3 K = 7.7 × 10^4
←

ll

Select the true statement about the reaction shown below

H2(g) + CO2(g) → H2O(g) + CO(g) Δhrxn = +41 kJ/mol
←

Cooling the reaction mixture down will decrease the yield of H2O

The decomposition of NH4HS is enothermic

NH4HS(g) → NH3(g) + H2S(g)
←

What change to an equilibrium mixture of this reaction results in the formation of more H2S

An increase in temperature

Solid AB decompresses into gaseous A and B

AB(s) → A(g) + B (g) K = 0.0081 at 0℃
←


Which set of concentrations represents a system where solid AB is an equilibrium with gaseous A and B

0.090 M A and 0.090 M B

What is the effect of adding helium gas (at constant volume) to an equilibrium mixture of the reaction

CO(g) + Cl2(g) → COCl2 (g)
←

The reaction does not shift in either direction