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Chemical Reactions And Types
Test Description: Chemical reactions and types
Instructions: Answer all questions to get your test result.
1) A chemical reaction has NOT occurred if the products have
A
the same mass as the reactants.
B
the same chemical properties as the reactants
C
less energy than the reactants
D
more energy than the reactants
2) The word equation solid carbon + oxygen gas ® carbon dioxide gas + energy, represents a chemical reaction because
A
Carbon dioxideis a gas and carbon is a crystal.
B
the reaction releases energy.
C
Carbon dioxide has chemical properties that differ from those of C and O.
D
the reaction absorbs energy.
3) In what kind of reaction do two or more substances combine to form a new compound?
A
ioinic
B
decomposition
C
double displacement
D
synthesis
4) In what kind of reaction do two or more substances combine to form two or more simpler substances?
A
synthesis
B
ionic
C
decomposition
D
displacement
5) In what kind of reaction does one element replace a similar element in a compound?
A
ionic
B
displacement
C
decomposition
D
synthesis
6) According to the law of conservation of mass, the total mass of the reacting substances is
A
always equal to the total mass of the products.
B
sometimes more and sometimes less than the total mass of the products.
C
always more than the total mass of the products.
D
always less than the total mass of the products.
7) Which word equation represents the reaction that produces water from hydrogen and oxygen?
A
Water can be separated into hydrogen and oxygen.
B
Water plus hydrogen yields oxygen
C
Hydrogen plus oxygen yields water.
D
Water is produced from hydrogen and oxygen.
8) Chemical reactions ____.
A
produce new substances
B
occur only in living organisms
C
create and destroy atoms
D
only occur outside living organisms
9) Chemical equations ____.
A
describe chemical reactions
B
describe only biological changes
C
give directions for naming chemical compounds
D
show how to write chemical formulas
10) Which of the following statements is NOT true about what happens in all chemical reactions?
A
New atoms are formed as products.
B
The ways in which atoms are joined together are changed.
C
The starting substances are called reactants.
D
The bonds of the reactants are broken and new bonds of the products are formed.
*select an answer for all questions
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