Chemical Reactions Part 1 Test Review Question Preview (ID: 49181)


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Which of the following occurs in an endothermic reaction but not in an exothermic reaction?
a) molecules are formed
b) atoms are rearranged
c) energy is absorbed
d) chemical bonds are broken

Catalysts that slow reactions are called
a) inhibitors
b) balanced
c) endothermic
d) substrates

In a balanced chemical equation, the mass of the reactants is equal to the
a) volume of the reactants
b) atoms in the molecule
c) atomic mass of the elements
d) mass of the products

A type of reaction that produces an increase in temperature is
a) endothermic
b) thermic
c) combustion
d) exothermic

Which of the following stores chemical energy?
a) the density of a substance
b) the bonds of a molecule
c) the temperature of a substance
d) the nucleus of an atom

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

What happens in a chemical reaction?
a) atoms are rearranged
b) atoms are created
c) atoms are heated and cooled
d) atoms are destroyed

A substance that undergoes a change in a chemical reaction is
a) an enzyme
b) a chemical
c) a reactant
d) a product

A release of energy is a sign that
a) oxygen is present
b) a physical change has just occurred
c) organic chemicals are present
d) a chemical change is taking place

Which of the following will increase the rate of a reaction?
a) adding a catalyst
b) decreasing the surface area
c) increasing the pressure
d) lowering the temperature

A substance that is formed in a chemical reaction is called the
a) radical
b) reactant
c) polymer
d) product

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

Which of these are a sign that a chemical reaction has occurred?
a) material dissolves
b) changes phases (solid to a liquid)
c) solution disappears
d) energy change

Which of the following are the products and reactants of a chemical reaction most likely to have in common?
a) molecules
b) physical properties
c) atoms
d) chemical properties

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

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

A slow reaction is likely to occur when the reactants have _______ temperatures and _________ surface areas.
a) low, small
b) high, large
c) high, small
d) low, large

At higher temperatures, food cooks faster because particles of foos
a) collide more often
b) increase in number
c) take up less space
d) come in contact with water

A reaction in which the products contain more chemical energy than the reactants is
a) exergonic
b) electrical
c) endothermic
d) exothermic

Which is not true of catalysts?
a) they can be reused
b) they can slow down a reaction
c) they are used up in a reaction
d) they can speed up a reaction

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