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