Kinetics & Equilibrium Exam Review

Given the reaction:

CH₄(g) + 2O₂(g) --> 2H₂O(g) + CO₂(g)

What is the overall result when CH₄(g) burns according to this reaction?

• Energy is released and the ΔH is positive

• Energy is released and the ΔH is negative

• Energy is absorbed and the ΔH is positive

• Energy is absorbed and the ΔH is negative

Tags

NGSS.HS-PS1-4

Which statement correctly describes an endothermic chemical reaction?

• The products have lower potential energy than the reactants, and the ΔH is positive

• The products have lower potential energy than the reactants, and the ΔH is negative

• The products have higher potential energy than the reactants, and the ΔH is positive

• The products have higher potential energy than the reactants, and the ΔH is negative

Tags

NGSS.HS-PS1-4

Which balanced equation represents an endothermic reaction?

• N₂(g) + 3H₂(g) --> 2NH₃(g)

• N₂(g) + O₂(g) --> 2NO(g)

• CH₄(g) + 2O₂(g) --> CO₂(g) + 2H₂O(l)

• C(s) + O₂(g) --> CO₂(g)

Tags

NGSS.HS-PS1-4

A solution at equilibrium must be

• concentrated

• saturated

• unsaturated

• diluted

Tags

NGSS.HS-PS1-6

Given the reaction:

2H₂(g) + O₂(g) --> 2H₂O(l) + 571.6kJ

What is the approximate ΔH for the formation of 1 mole of H₂O(l)?

• -571.6 kJ

• +571.6 kJ

• -285.5 kJ

• +285.5 kJ

Tags

NGSS.HS-PS1-4

Which statement about a system at equilibrium is true?

• The forward reaction rate stops and the reverse reaction rate continues

• The forward reaction rate is greater than the reverse reaction rate.

• The forward reaction rate is less than the reverse reaction rate

• The forward reaction rate is equal to the reverse reaction rate.

Tags

NGSS.HS-PS1-6

Given the reaction

S(s) + O₂(g) --> SO₂(g) + energy

Which diagram best represents the potential energy changes for this reaction?

• a

• b

• c

• d

Tags

NGSS.HS-PS1-4

The potential energy diagram below represents a reaction.

Which arrow represents the activation energy of the forward reaction

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

Given the potential energy diagram for the chemical reaction:

Which statement correctly describes the energy changes that occur in the forward reaction

• The activation energy is 50kJ and the reaction is exothermic

• The activation energy is 50kJ and the reaction is endothermic

• The activation energy is 10kJ and the reaction is exothermic

• The activation energy is 10kJ and the reaction is endothermic

Tags

NGSS.HS-PS1-4

Increasing the temperature increases the rate of a reaction by

• lowering the activation energy

• increasing the frequency of effective collisions between reacting molecules

• lowering the frequency of effective collisions between reacting molecules

• increasing the activation energy

Tags

NGSS.HS-PS1-5