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