Chem review

Hydrogen Bonding

Ammonia’s(NH3) unusually high melting point is the result of
A. Covalent bonding.

B. London dispersion forces
C. Ionic bonding

D. Hydrogen Bonding

unsaturated

What is the name given to a solution that contains less solute than it can dissolve?

Unsaturated

Saturated

Supersaturated

oversaturated

atmospheric pressure

Which of the following is not a colligative property

Freezing point depression

boiling point elevation

atmospheric pressure

Meniscus

What name is given to the curved surface of a liquid contained in a narrow tube

capillary point

surface tension

meniscus

adhesion point

MgO

Which of the following ionic compounds should have the highest melting point?

NaI

MgO

LiBr

CaS

NH3

Which of the following compounds exhibits hydrogen bonding

Ch3Cl

HI

CH3OCH3

NH3

Biological catalysts

Enzymes are

Biological catalysts

usually heterogeneous catalysts

large carbohydrate molecules

also called substrates

Overall third order

If a reaction has a rate equation of rate = k[A][B][C], then it is

Overall second order

overall first order

overall third order

zero order in A

Tripling [B]

The reaction has the rate law: rate = k[A][B]². Which will cause the rate to increase the most?

Doubling [A]

lowering the temperature

tripling [B]

Quadrupling [A]

1

What is the value for the van’t hoff factor for all nonelectrolytes

1

0

-1/2

1/2

Rate = K[N2O][NO]

What is the rate law for the following machanism?

9.24 × 10³ min^-1

Calculate rate constant k for a first order reaction with a half-life of 75.0 min

52 min^-1

9.24 × 10³ min^-1

1.54 × 10^-4 min^-1

1.33 × 10^-2 min^-1

6.12 × 10³ mmHg

What is the osmotic pressure in mmHg of 6.00 L of a 0.108 M solution at 30C if three moles of ions are produced in aqueous solution for every mole of solute dissolved

8.05 mmhg

6.12 × 10³ mmHg

0.0612 mmhg

3,68 × 10^4 hhmg

• A. Hydrogen and nitrogen will be produced at the expense of ammonia.

A container was charged with hydrogen, nitrogen, and ammonia gases at 120°C and the system was allowed to reach equilibrium. What will happen if the volume of the container is increased at constant temperature?

$$3\text{H}_2(g) + \text{N}_2(g) \rightleftharpoons 2\text{NH}_3(g)$$

• A. Hydrogen and nitrogen will be produced at the expense of ammonia.

• B. There will be no effect.

• C. More ammonia will be produced at the expense of hydrogen and nitrogen.

• D. The equilibrium constant will increase.

• D. the moles of gas are not equal on the two sides of the equation.

In a reaction at equilibrium involving only gases, a change in pressure of the reaction mixture shifts the position of equilibrium only when:

• A. heat is absorbed by the reaction proceeding to the right.

• B. the gases are impure.

• C. the collision rate increases.

• D. the moles of gas are not equal on the two sides of the equation.

• D. toward reactants because Q_c = 505

Consider the reaction: CO(g) + 3H₂(g) ⇌ H₂O(g) + CH₄(g), K_c = 190 at 1000 K. If a vessel is filled with these gases such that the initial concentrations are [CO] = 0.025 M, [H₂] = 0.045 M, [H₂O] = 0.025 M, and [CH₄] = 0.046 M, in which direction will a reaction occur and why?

• A. toward products because Q_c = 0.17

• B. toward reactants because Q_c = 0.0029

• C. toward products because Q_c = 0.35

• D. toward reactants because Q_c = 505

• A. HCO₃⁻

What is the conjugate acid of CO₃²⁻ in the reaction below?

CO₃²⁻ + HSO₄⁻ ⇌ HCO₃⁻ + SO₄²⁻

• A. HCO₃⁻

• B. SO₄²⁻

• C. OH⁻

• D. H₃O⁺

• D. acids: NH₄⁺, H₂O bases: OH⁻, NH₃

Choose the Brønsted-Lowry acids and bases in the following equation:

NH₄⁺ + OH⁻ ⇌ H₂O + NH₃

• A. acids: NH₄⁺, OH⁻ bases: H₂O, NH₃

• B. acids: OH⁻, H₂O bases: NH₃, NH₄⁺

• C. acids: NH₄⁺, OH⁻ bases: NH₄⁺, H₂O

• D. acids: NH₄⁺, H₂O bases: OH⁻, NH₃

What is the equilibrium constant expression for the following reaction?

2C₆H₆(g) + 15O₂(g) ⇌ 12CO₂(g) + 6H₂O(g)

H2SO4

Which is the strongest acid

H2SO4

HSO3-

H2SO3

HSO4

Remove Br2

For the following reaction at equil. which choice gives a change that will shift the position of equilibrium to faver formation of more products

D. homogeneous catalyst

Which of the following keeps the equilib position unchanged
temperature decrease
concentration change
temperature increase

homogeneous catalyst

D. A solution containing a weak acid and its conjugate base

Which results in a buffered solution
A. A solution containing a strong base and its conjugate acid.

B. A solution containing a strong acid and its conjugate base.

C. A solution containing two organic liquids. D. A solution containing a weak acid and its conjugate base.

D. A solution containing a weak acid and its conjugate base

A. Decreasing the volume of the mixture

This equilibrium can be shifted to the right by

titrant

The solution that is added from the buret during a titration is that

buffer

titrant

indicator

base

D. Shifts to the left

For a reaction, the reaction quotient Qc > Kc the reaction

THe solution has an [OH-] = 2.95 M

A solution has pOH of -0.47. This means that:

1.4 × 10^7

value for kc for the reaction below N2 = 0,025 M H2 = 0.0013 M and NH3 = 0.028 M for the following reaction?

N2(g) + 3H2(g) — 2NH3(g)

8.6 × 10²

1.4 × 10^7

1.2 × 10^-3

7.1 × 10^-8

4

When the following redox equation is balanced usong the smallest whole-number coefficients, what is the coefficient of NO2

Sn + HNO3 ——- SnO2 + NO2 + H2O

1

2

3

4

D. 1,2, and 5

Which of the following statements are true?

1. Liquids have more entropy than their solids

2. Solutions have more entropy than the solids dissolved

3. gases and their liquids have equal entropy

4. gases have less entropy than their solids

5. entropy of a substands increases as its temperature increases

A. 2,3, and 5

B. 1,3, and 5

C. 1,4, and 5

D. 1,2, and 5

D. Triangle S > 0, triangle H >0

For a chemical reaction to be spontaneous only at high temperatures, which conditions must be met?

C. If triangle G < 0 , then Q < K

Which of these statements in correct

Electrons

Beta particles are identical to

A. Helium atoms

B. Electrons

C. Hydrogen atoms

D. Helium nuclei

Alpha

THe most massive particle is

Alpha

beta

gamma

positron

temperature independent

Radioactive decay is

temperature independent

a second order process

a zero order process

a process with a large activation energy

NO2

Which is a key player in the formation of ozone?

NO2

SO2

NO

SO3

N2

Which is not a greenhouse gas

CH4

CO2

H2O

N2

low melting point, low density, and soft

What are some characteristics of alkali metals

pick low/high melting point, low/high, density, and soft/hard

Mineral

What is a naturally occurring substance with range of chemical compositions

ore

mineral

metallory

alloy

false

Metallic crystals are not good conductors of heat and electricity true or false

false

IR light breaks bonds, causuing molecules to come apart trure of false

false

Deforestation removes CO2 true or false

true

Aluminum is the most abundant metal true or false