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Chapter 3
Test Description: Pearson
Instructions: Answer all questions to get your test result.
1) Chemistry is
A
anything that has mass and takes up space.
B
a characteristic of a substance that can be observed without changing the substance into another substance.
C
the study of matter and how matter changes.
D
a rapid reaction between oxygen and a substance called a fuel.
2) The only sure evidence for a chemical reaction is
A
the production of one or more new substances.
B
changes in properties.
C
the formation of a gas.
D
a color change.
3) A material used to decrease the rate of a chemical reaction is a(n)
A
inhibitor.
B
enzyme.
C
catalyst.
D
fuel.
4) CaCO3 represents a chemical
A
subscript.
B
formula.
C
symbol.
D
reaction.
5) In chemical reactions, what does the principle of conservation of mass mean?
A
The total mass of the reactants is greater than the total mass of the products.
B
The total mass of the reactants is less than the total mass of the products.
C
Matter is not created or destroyed.
D
Matter is not changed.
6) Chemicals that act as biological catalysts by speeding up reactions in living things are called
A
reactants.
B
fuels.
C
inhibitors.
D
enzymes.
7) What type of reaction is FeS + 2 HCl FeCl2 + H2S?
A
a double replacement reaction
B
a single replacement reaction
C
a decomposition reaction
D
a synthesis reaction
8) What happens when chemical bonds break and new bonds form?
A
a physical change
B
a chemical change
C
surface area increases
D
matter is destroyed
9) A shorter, easier way to show a chemical reaction, using symbols instead of words, is called a
A
chemical formula.
B
subscript.
C
symbol.
D
chemical equation.
10) The substances listed on the left side of a chemical equation are the
A
reactants.
B
precipitates.
C
products.
D
coefficients.
11) A chemical reaction that absorbs energy in the form of heat is described as
A
endothermic.
B
combustion.
C
exothermic.
D
unbalanced.
12) The minimum amount of energy needed to start a reaction is the
A
activation energy.
B
endothermic energy.
C
chemical energy.
D
exothermic energy.
13) When a chemical reaction takes place in an open system,
A
matter can enter from the surroundings, but cannot escape to the surroundings.
B
matter cannot move at all.
C
matter can enter from or escape to the surroundings.
D
matter is not allowed to enter from or escape to the surroundings.
14) Physical changes occur when existing bonds break and new bonds form.
A
True
B
False
15) The amount of matter in a chemical reaction changes.
A
True
B
False
16) Synthesis is the process of making a more complex compound from simpler substances.
A
False
B
True
17) A precipitate is a(n) ____________________ that forms from solution during a chemical reaction.
A
products
B
replacement
C
chemical
D
solid
18) In a chemical equation, the substances written on the right side of the arrow are called ____________________.
A
inhibitor
B
products
C
concentration
D
decomposition
19) The _________________________ is the minimum amount of energy that must be added to start a chemical reaction.
A
open system
B
exothermic
C
activation energy
D
conservation of mass
20) The ____________________ is the amount of one material present in a given volume of another material.
A
chemical
B
solid
C
inhibitor
D
concentration
*select an answer for all questions
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