Concept 3 Energy Flow

Which phrase best describes an exothermic chemical reaction?

• Does not absorb any energy.

• Forms products with higher bond energy than reactants.

• Is in a state of equilibrium.

• Releases more energy than it absorbs.

Tags

NGSS.HS-PS1-4

Identify the products in this reaction:

• 6H₂O and 6CO₂

• 6CO₂ and C₆H₁₂O₆

• 6H₂O, C₆H₁₂O₆ and 6O₂

• C₆H₁₂O₆ and 6O₂

Tags

NGSS.HS-LS1-5

NGSS.HS-LS1-6

Chemical reactions that absorb more energy than they release are considered to be________________________.

• exothermic

• catalyzed

• endothermic

• anabolic

Tags

NGSS.HS-PS1-4

The activation energy needed for a chemical reaction is decreased by the presence of a ________________________.

• catalyst

• reactant

• product

• substrate

In the enzyme substrate pictured above, what is happening during the second picture?

• The catalyzed reaction is releasing a product.

• The enzyme is breaking bonds in the substrate.

• The enzyme is keeping the bonds the same in the substrate.

• The substrate is beginning to bind to the enzyme.

Tags

NGSS.HS-PS1-5

If the activation energy of a biochemical reaction is lowered, then

• the reaction will happen faster.

• the reaction will happen more slowly.

• more energy will need to be absorbed.

• the rate of the reaction will be unaffected.

The molecule that an enzyme binds to is known as its___________.

• substrate

• monomer

• polymer

• active site

Reactants bind to enzymes at the ____________________.

• substrate

• product

• activation energy

• active site

In the graph above, an increase in temperature results in

• a decrease in the required activation energy.

• an increase in reaction rate.

• a decrease in the rate of reaction.

• an increase in both the reaction rate and activation energy.

Tags

NGSS.HS-PS1-5

Chemical reactions change ______________and make________________.

• Bonds

• Reactants

• Energy

• Products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5