Catalysts and Activation Energy

What do you call the energy that is required to start a reaction?

• Alternative energy

• Activation energy

• Atmospheric energy

How does a catalyst work in speeding up a reaction?

• By lowering the activation energy or reaction

• by making them more available

• by giving them more energy

The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

• Red, because the activation energy is larger

• Blue, because the activation energy is lower

• both reaction progress at the same rate

Tags

NGSS.HS-PS1-4

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

• catalyst

• reactant

• product

• substrate

Many of the proteins in the human body are enzymes that catalyze chemical reactions. What is the relationship between enzymes and activation energy?

• When an enzyme catalyzes a reaction, it increases the activation energy of the reaction

• When an enzyme catalyzes a reaction, it increases the activation energy of the product.

• When an enzyme catalyzes a reaction, it decreases the activation energy of the reaction.

• When an enzyme catalyzes a reaction, it does not affect the activation energy of the

  reaction

Tags

NGSS.HS-PS1-5

What is the relationship between enzymes and activation energy?

• When an enzyme catalyzes a reaction, it increases the activation energy of the reaction

• When an enzyme catalyzes a reaction, it increases the activation energy of the product.

• When an enzyme catalyzes a reaction, it decreases the activation energy of the reaction.

• When an enzyme catalyzes a reaction, it does not affect the activation energy of the

  reaction

Many of the proteins in the human body are enzymes that catalyze chemical reactions. What is the relationship between enzymes and activation energy?

• When an enzyme catalyzes a reaction, it increases the activation energy of the reaction

• When an enzyme catalyzes a reaction, it increases the activation energy of the product.

• When an enzyme catalyzes a reaction, it decreases the activation energy of the reaction.

• When an enzyme catalyzes a reaction, it does not affect the activation energy of the

  reaction

Enzymes ___________________ activation energy to speed up chemical reactions.

• increase

• decrease

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

• catalyst

• reactant

• product

• solute

Tags

NGSS.HS-PS1-5

What does catalyst do to a reaction?

• Slows down the reaction

• Nothing changes

• Speeds up the reaction

Tags

NGSS.HS-PS1-5