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Chemical Reactions Part 1 Test Review
Test Description: Complete the Test Review to prepare for your test Tomorrow
Instructions: Answer all questions to get your test result.
1) A reaction in which the products contain more chemical energy than the reactants is
A
exothermic
B
exergonic
C
electrical
D
endothermic
2) At higher temperatures, food cooks faster because particles of foos
A
come in contact with water
B
collide more often
C
take up less space
D
increase in number
3) A slow reaction is likely to occur when the reactants have _______ temperatures and _________ surface areas.
A
high, small
B
low, large
C
high, large
D
low, small
4) In an exothermic reaction, energy is transferred from
A
reactants to the surroundings
B
surroundings to the reactants
C
one reactant to another
D
the container to the chemicals
5) A balanced equation shows the proportions of reactants and products necessary for
A
energy use to be minimized
B
mass to be conserved
C
electrolysis to occur
D
the reaction to occur
6) A chemical equation is balanced by changing or adding
A
reactants
B
subscripts
C
chemical symbols
D
coefficients
7) Which of these are a sign that a chemical reaction has occurred?
A
material dissolves
B
solution disappears
C
energy change
D
changes phases (solid to a liquid)
8) Which of the following are the products and reactants of a chemical reaction most likely to have in common?
A
chemical properties
B
physical properties
C
molecules
D
atoms
9) A substance that is formed in a chemical reaction is called the
A
product
B
radical
C
polymer
D
reactant
10) Which of the following will increase the rate of a reaction?
A
adding a catalyst
B
increasing the pressure
C
decreasing the surface area
D
lowering the temperature
11) A substance that undergoes a change in a chemical reaction is
A
a product
B
a chemical
C
an enzyme
D
a reactant
12) A release of energy is a sign that
A
oxygen is present
B
a chemical change is taking place
C
a physical change has just occurred
D
organic chemicals are present
13) What happens in a chemical reaction?
A
atoms are destroyed
B
atoms are rearranged
C
atoms are created
D
atoms are heated and cooled
14) Which statement about endothermic reactions is correct?
A
energy is always created in the form of heat
B
energy is transferred from the surroundings to the reactants
C
energy is transferred from the reactants to the surroundings
D
energy is used to force electrons to move to higher energy levels
15) Which of the following stores chemical energy?
A
the density of a substance
B
the nucleus of an atom
C
the bonds of a molecule
D
the temperature of a substance
16) A type of reaction that produces an increase in temperature is
A
endothermic
B
exothermic
C
combustion
D
thermic
17) In a balanced chemical equation, the mass of the reactants is equal to the
A
atomic mass of the elements
B
mass of the products
C
atoms in the molecule
D
volume of the reactants
18) Which of the following occurs in an endothermic reaction but not in an exothermic reaction?
A
chemical bonds are broken
B
molecules are formed
C
atoms are rearranged
D
energy is absorbed
19) Catalysts that slow reactions are called
A
substrates
B
inhibitors
C
balanced
D
endothermic
20) Which is not true of catalysts?
A
they can be reused
B
they are used up in a reaction
C
they can speed up a reaction
D
they can slow down a reaction
*select an answer for all questions
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