Reaction Rates Quiz

What must occur to have an effective reaction to occur? (Select all answers that apply).

• Sufficient energy

• Correct orientation

• Two different reactants.

• minimum activation energy

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-4

What can prevent a chemical reaction to occur?

• Corrent orientation of reactants

• Increasing the concentration of products

• Insufficient activation energy

Tags

NGSS.HS-PS1-4

What determines the rate at which the reaction occurs?

• Mass of the products

• Concentration of products

• The frequency of effective collisions.

Tags

NGSS.HS-PS1-5

Activation energy is required to start a chemical reaction. What is activation energy?

• The energy needed for a reaction to occur
• The minimum amount of energy needed for a reaction to potentially occur
• The energy added by a catalyst
• The energy possessed by the products

Tags

NGSS.HS-PS1-4

A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 

• catalyst
• product
• reactant
• solute

Tags

NGSS.HS-PS1-5

What does a catalyst do to speed up a reaction?

• It reduces the surface area of the reactants

• It increases the surface area of the reactants.

• It reduces the required energy for a chemical reaction to occur and provides an alternative pathway.

• It increases the required energy for a chemical reaction to occur

Tags

NGSS.HS-PS1-5

Select the factors that can speed up a chemical reaction (can select multiple answers).

• Increase temperature

• Increase pressure (gases only)

• Increase surface area

• Add catalyst

• Increase concentration

Tags

NGSS.HS-PS1-5

Why does a higher temperature increase the rate of a reaction?

• it increases both the frequency and energy of particle collisions
• it only increases the frequency of particle collisions
• it only increases the energy of particle collisions
• it reduces the activation energy of the reaction

Tags

NGSS.HS-PS1-5

Why does a higher concentration increase the rate of reaction?

• it increases the amount of reactants
• it lowers the activation energy
• it increases the energy of particle collisions
• it increases the frequency of particle collisions because there are more collision sites

Tags

NGSS.HS-PS1-5

Which of these will NOT speed up the rate of reaction between a strip of magnesium and hydrochloric acid?

• tightly coil up the strip of magnesium
• cut up the strip of magnesium
• increase the concentration of the hydrocholoric acid
• increase the temperature of the hydrocholoric acid

Tags

NGSS.HS-PS1-5