Enzymes and Chemical Reactions

What aspects of a chemical reaction are enzymes known to affect?

• direction and reactant concentration

• rate and activation energy

• temperature and pH

• conditions needed for equilibrium

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

The activation energy needed for a chemical reaction is decreased by a

• catalyst

• reactant

• product

• substrate

What do you call a biological catalyst?

• Product

• Reactant

• Biological reaction

• Enzyme

When looking at the enzyme substrate model, the substrate turns into what at the end of the chemical reaction?

• Nothing

• It does not change

• Products

• Pieces

What is the function of an enzyme?

• enzymes break themselves into small pieces

• enzymes slow down chemical reactions

• enzymes speed up chemical reactions

• enzymes combine products to form reactants 

How does an enzymes shape relate to its function?

• the shape of the enzyme has no relation to its function

• the enzyme is shaped specially for certain substrates to perform a specific reaction

• the enzyme shape acts as a receptor to certain products

• the enzyme shape can fit into specific substrates to cease a reaction

How does a catalyst work in speeding up a reaction?

• By lowering the activation energy or reaction

• by giving them more energy

• by making them more available

What type of reaction is this?

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4

What change in condition increases the speed of the reacting molecules?

• Decreasing temperature

• Increasing temperature

• Decreasing energy

• Increasing power

Tags

NGSS.HS-PS1-5

What is the activation energy in a reaction?

• The energy needed for products to be formed

• The energy needed to break products into reactants

• The minimum energy needed to make products

• The minimum energy needed by reactants for them to react