AP Chemistry Review

Define activation energy and its role in kinetics.

• Activation energy is the energy stored in the reactants

• Activation energy is the energy required for a reaction to stop

• Activation energy is the minimum energy required for a reaction to occur and influences the reaction rate by affecting the frequency of successful collisions.

• Activation energy is the energy released during a reaction

Tags

NGSS.HS-PS1-5

What is the half-life of a first-order reaction?

• t1/2 = 2k

• t1/2 = k / ln(2)

• t1/2 = 1/k

• t1/2 = ln(2) / k

Tags

NGSS.HS-PS1-5

Tags

NGSS.HS-PS1-7

Calculate the equilibrium constant, Keq, for the following reaction at 25 °C, if [NO]eq = 0.106 M,[O2]eq = 0.122 M and [NO2]eq = 0.129 M2 NO (g) + O2 (g) <-----> 2 NO2 (g)

Tags

NGSS.HS-PS1-7

What is the mass % of carbon in dimethylsulfoxide (C₂H₆SO) rounded to three significant figures?

A) 30.7

B) 28.6

C) 25.4

D) 78.1

E) 7.74

One mole of ________ contains the largest number of atoms.

A) Cl₂

B) S₈

C) Al₂(SO₄)₃

D) Na₃PO₄

E) C₁₀H₈

When the following equation is balanced, the coefficient of H₂S is ________.
FeCl₃ (aq) + H₂S (g) → Fe₂S₃ (s) + HCl (aq)

Tags

NGSS.HS-PS1-7

Calculate the percentage by mass of nitrogen in PtCl₂(NH₃)₂.

Write the balanced equation for the reaction that occurs when methanol, CH₃OH (l), is burned in

air. What is the coefficient of methanol in the balanced equation?

Tags

NGSS.HS-PS1-7

Which of the following are decomposition reactions?

1) CH₄ (g) + O₂ (g) → CO₂ (g) + H₂O (l)

2) CaO (s) + CO₂ (g) → CaCO₃ (s)

3) Mg (s) + O₂(g) → MgO (s)

4) PbCO₃ (s) → PbO (s) + CO₂ (g)

A) 1, 2, and 3

B) 4 only

C) 2, 3, and 4

D) 1, 2, 3, and 4

E) 2 and 3

Tags

NGSS.HS-PS1-7