Chemical Reactions And Enzymes: Question Preview (ID: 15932)

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Identify the reactant(s) shown here: CO2 + H2O → H2CO3.
a) CO2
b) CO2 + H2O
c) H2CO3
d) H2O + H2CO3

The energy needed to get a reaction started is the ___.
a) adhesion energy
b) cohesion energy
c) chemical energy
d) activation energy

Which of the following statements is true about catalysts?
a) Catalysts slow down the rate of chemical reactions
b) All catalysts are enzymes
c) Catalysts are used up during a chemical reaction
d) Catalysts lower the activation energy of a chemical reaction

The elements or compounds that go into a chemical reaction are ____.
a) catalysts
b) products
c) reactants
d) isotopes

Which of the following statements about enzymes is NOT true?
a) Enzymes work best at a specified pH
b) The shape of an enzyme allows it to work with a particular substrate
c) Enzymes are proteins
d) The place where a substrate connects with an enzyme is called the substrate site

Which of the following is LEAST likely to affect the rate of enzyme activity?
a) pH
b) temperature
c) regulatory molecules
d) amount of the substrate

Chemical reactions cannot occur without a catalyst.
a) true
b) false

Chemical reactions that absorb energy MUST have a source of energy to occur
a) true
b) false

Catalase (found in liver cells) is an enzyme that breaks down H2O2
a) true
b) false

The elements or compounds that are created as a result of a chemical reaction are called ____
a) reactants
b) products
c) activation energy
d) enzymes

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