Chemistry Kinetics

Which change increases the rate of a chemical reaction?

• Increasing the size of solid reactant particles

• Decreasing the concentration of aqueous reactants

• Increasing the surface area of a solid reactant

• Decreasing the pressure of gaseous reactants

Tags

NGSS.HS-PS1-5

Which is not affected by an increase in temperature?

• Rate of reaction

• Collision frequency

• Collision geometry

• % of molecules with E ≥ E_a

Tags

NGSS.HS-PS1-5

Which statement best describes and explains the effect of a catalyst on the rate of a chemical reaction?

• The rate increases because the frequency of collisions between particles increases.

• The rate increases because more colliding particles have the energy needed to react.

• The rate increases because the activation energy increases.

• The rate increases because more molecules are present.

Tags

NGSS.HS-PS1-5

Which statements explain the increase in the rate of a reaction when the temperature is increased?

• I and II only

• I and III only

• II and III only

• I, II and III

Tags

NGSS.HS-PS1-5

In which flask will the reaction between 2.0 g of magnesium carbonate and 25 cm³ 1.0 mol dm^–3 hydrochloric acid occur most rapidly?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-5

Which changes increase the rate of the reaction below? C₄H₁₀ (g) + Cl₂ (g)  →  C₄H₉Cl (l) + HCl (g)

• I and II only

• I and III only

• II and III only

• I, II and III

Tags

NGSS.HS-PS1-5

Which of the following can increase the rate of a chemical reaction?

• I and II only

• I and III only

• II and III only

• I, II and III

Tags

NGSS.HS-PS1-5

Which statement is true about using sulfuric acid as a catalyst in this reaction?

• I and II only

• I and III only

• II and III only

• I, II and III

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

What is the best definition of rate of reaction?

• The time it takes to use up all the reactants

• The rate at which all the reactants are used up

• The time it takes for one of the reactants to be used up

• The increase in concentration of a product per unit time

Tags

NGSS.HS-PS1-5

Which is the activation energy of the forward reaction?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4