Rate of Reactions

What is the meaning of the rate of reaction?

• Decrease in amount of product

• Decrease in amount of product against time

• Increase in amount of products against time

• Increase in amount of reactants against time

Tags

NGSS.HS-PS1-5

The rate of reaction for the decomposition of hydrogen peroxide decreases with time because

• product of reaction decreases

• temperature of hydrogen peroxide decreases

• volume of hydrogen peroxide decreases

• concentration of hydrogen peroxide decreases

Tags

NGSS.HS-PS1-5

Products will form faster if____________

• the particle size of the reactants are larger.

• temperature is decreased.

• concentration of the reactants are increased.

• the reaction is not stirred.

Tags

NGSS.HS-PS1-5

The collision theory states that atoms, ions, and molecules must collide in order to react.

• True

• False

Tags

NGSS.HS-PS1-5

A catalyst works by

• changing the order of the reaction

• increasing the temperature

• lowering the activation energy

• making the activated complex

The following equation represents a chemical equation.

CaCO₃ + 2HCl --> CaCl₂ + CO₂ + H₂O

Which graph shows the correct change in mass of reactant used in excess against time?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-7

Which of the following explains the meaning of effective collision?

• The collision where its energy is less than the activation energy

• The collision that has a low energy

• The collision which takes place before a reaction

• The collision that causes a reaction

Tags

NGSS.HS-PS1-5

Increasing the surface area of the reactants will increase the rate of the reaction.

• True

• False

Tags

NGSS.MS-PS1-4

Increasing the temperature of a reaction will __________ the rate of the reaction.

• increase

• decrease

Tags

NGSS.HS-PS1-5

An enzyme increases the rate of a reaction.

• True

• False