Chapter 6 Qs For Final Review: Question Preview (ID: 25576)

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Which of the following is an example of a decomposition reaction?
a) photosynthesis
b) digestion
c) polymerization
d) exchange of ions between two compounds

Which statement about endothermic reactions is true?
a) energy is transferred from surroundings to the reactants
b) energy is transferred from the reactants to the surroundings
c) energy is always created in the form of heat
d) energy is used to force electrons to move to higher energy levels

A balanced chemical equation shows proportions of reactants and products necessary for
a) energy to be minimized.
b) the reaction to occur.
c) mass to be conserved.
d) electrolysis to occur.

A synthesis reaction is a reaction between at least two compounds in which...
a) a new. more complex compound is formed.
b) one breaks down into at least two products.
c) a compound burns in the presence of oxygen.
d) a compound is decomposed by an electric current.

A chemical equation is balanced by changing or adding...
a) coefficients.
b) subscripts.
c) powers.
d) reactants.

In an exothermic reaction, energy is transferred from
a) one reactant to another.
b) the container to the chemicals.
c) the reactants to the surroundings.
d) the surroundings to the reactants.

An enzyme is a special kind of catalyst that works to...
a) speed up a specific biochemical reaction.
b) slow down a chemical reaction.
c) break down chemical elements.
d) maintain the correct temperature for a reaction.

In a balanced chemical reaction, the total mass of the products always equals the...
a) molar mass of the reactants.
b) atomic mass of the reactants.
c) total mass of the reactants.
d) proportional masses of the reactants.

A reaction in which a single compound breaks down to form 2 or more simpler substances is called _____________________________.
a) decomposition
b) synthesis
c) single-displacement
d) double-displacemet

A substance that forms in a chemical reaction is called....
a) a product.
b) a reactant.
c) an ion.
d) a chemical bond.

A reaction in which two or more substances combine to form a new compound is called...
a) decomposition.
b) synthesis.
c) combustion.
d) electrolysis.

A reaction in which heat is released to the surroundings is called...
a) exothermic.
b) endothermic.
c) combustion.
d) decomposition.

The oxidation reaction of an organic compound in which heat is released is called...
a) combustion.
b) decomposition.
c) synthesis.
d) exothermic.

A ________________ is a substance that changes the rate of a reaction without being consumed or changed significantly.
a) substrate
b) radical
c) catalyst
d) enzyme

_____________________ is the relative number of moles of the substances required to produce a given amount of product in a reaction.
a) Mole ratio
b) Molar mass
c) Moles
d) Molecular formula

The process by which an electric current is used to produce a chemical reaction, such as the decomposition of water is called...
a) electrolysis.
b) decomposition.
c) synthesis.
d) combustion.

An organic group that has one or more electrons available for bonding is called...
a) a radical.
b) a catalyst.
c) an enzyme.
d) a substrate.

A substance or molecule that participates in a chemical reaction is called...
a) a product.
b) a reactant.
c) a substrate.
d) a catalyst.

A __________________ is a chemical reaction that requires heat.
a) endothermic reaction
b) exothermic reaction
c) combustion reaction
d) oxidation reduction reaction

___________________ is the energy released when a chemical compound reacts to produce new compounds.
a) Exothermic energy
b) Chemical energy
c) Chemical formula
d) Chemical bond

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