Chemical Reactions and Enzymes

Which of the following statements is true? 

• All proteins are enzymes
• All catalysts are enzymes
• All enzymes are catalysts
• All catalysts are proteins

What happens to an enzyme after the reaction it catalyzes has taken place?

• The enzyme is destroyed, and the cell must make another
• The enzyme holds on to the product until another enzyme removes it
• The enzyme is unchanged and ready to accept substrate molecules
• The enzyme changes shape so it can accept a different kind of substrate

The elements or compounds produced by a chemical reaction are known as 

• reactants
• enzymes
• products
• waste 

Tags

NGSS.MS-PS1-2

A process that involves rearrangement of the molecular structure of a substance

• Chemical change
• Physical change
• Activation change
• Reactant change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Crushing a can is an example of

• Chemical change
• Physical change
• Activation change
• Reactant change

Tags

NGSS.MS-PS1-2

 What are the products of the chemical reaction?CH₄ + 2O₂ -->
CO₂ + 2H₂O

• CH₄ + 2O₂
• 2H₂O+ 2O₂
• CO₂ + 2H₂O
• CH₄ +CO₂

Tags

NGSS.HS-PS1-2

Does the energy diagram show an exothermic reaction of an endothermic reaction?

• Endothermic
• Exothermic

Tags

NGSS.HS-PS1-4

How much activation energy is required to start this reaction?

• 40 kJ
• 100 kJ
• 60kJ
• 20 kJ

Tags

NGSS.HS-PS1-4

How much energy is lost in this chemical reaction?

• 20 kJ
• 40 kJ
• 80 kJ
• 60 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What is the chemical equation represented in the energy diagram?

• A+B-->C+D
• C+D-->A+B
• A-->B-->C-->D
• A+B<--C+D

Tags

NGSS.HS-PS1-4