Unit 3 Test 1 Review

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

NGSS.HS-PS3-4

Identify the products in this reaction: 6H₂O + 6CO₂ -> C₆H₁₂O₆ + 6O₂

• 6H₂O and 6CO₂

• 6CO₂ and C₆H₁₂O₆

• 6H₂O, C₆H₁₂O₆, and 6O₂

• C₆H₁₂O₆ and 6O₂

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

Chemical reactions that absorb more energy than they release are called

• exothermic.

• catalyzed.

• endothermic.

• activated.

Tags

NGSS.HS-PS1-4

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

• catalyst.

• reactant.

• product.

• substrate.

In the lock-and-key model of enzyme function pictured, what is happening during the second step?

• 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.

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

• the reaction will happen faster.

• the reaction will happen more slowly.

• this will not affect the rate of the reaction.         

• both A and B

The molecule that an enzyme binds to is known as its

• substrate.

• monomer.

• polymer.

• complimentary base.

Reactants bind to enzymes at the

• substrate.

• product.

• activation energy.

• active site.

In the graph, 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

Fill in the blank using the vocabulary in the word bank.

Chemical reactions change ___A___ and produce ___B___. The activation ___C___ is required in order for a chemical reaction to occur.  There are two kinds of chemical reactions, ___D___ and ___E___. An example of a reaction that releases energy is ___F___.  An example of a reaction that absorbs energy is ___G___. In order to make products, all chemical reactions break or form ___H___.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4