Chemical Reactions

Which of the following is a substance that lowers the activation energy? 

• ion 

  
  

• reactant 

  
  

• catalyst 

  
  

• substrate 

  
  

Which statement is true of chemical equations? 

• Reactants are on the right. 

  
  

• Products are on the right. 

  
  

• Products have fewer atoms than reactants. 

  
  

• Reactants have fewer atoms than products. 

  
  

Tags

NGSS.HS-PS1-7

Which describes an exothermic reaction?

• They release energy. 

  
  

• They require energy. 

  
  

• They create energy. 

  
  

• They destroy energy.

  
  

Tags

NGSS.HS-PS1-4

In which of the following are bonds broken and new bonds formed? 

• chemical reactions 

  
  

• elements 

  
  

• isotopes 

  
  

• polar molecules 

  
  

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-7

Which of the following decreases enzyme activity by binding to the active site? 

• inhibitors

  
  

• substrates 

  
  

• catalysts 

  
  

• pH