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Chemical Reactions
Test Description: Chemical equations
Instructions: Answer all questions to get your test result.
1) Which statement explains the Law of Conservation of Matter?
A
In a chemical reaction, matter can only be destroyed.
B
Matter can neither be created nor destroyed in a chemical reaction.
C
Matter can be created or destroyed in a chemical reaction.
D
In a chemical reaction, matter can only be created.
2) A + B AB What type of chemical reaction is this?
A
decomposition
B
single
C
double
D
synthesis
3) The substances to the left of the arrow in a chemical equation are called –
A
reactant
B
coefficient
C
subscript
D
product
4) The substances to the right of the arrow in a chemical equation are called-
A
coefficient
B
subscript
C
product
D
reactant
5) How many atoms of hydrogen (H), sulfur (S), and oxygen (O) are there in sulfuric acid (H2SO4)?
A
H-2, S-1, O-4
B
H-1, S-2, O-8
C
H-6, S-4, O-4
D
H-2, S-4, O-4
6) 2Ca + O2 2CaO What is the 2 located in front of calcium (Ca) called?
A
product
B
coefficient
C
subscript
D
reactant
7) 2Ca + O2 2CaO What is the 2 located behind oxygen (O) called?
A
reactant
B
product
C
subscript
D
coefficient
8) What happens to some of the mass when bubbles are formed during a chemical reaction?
A
escapes as a gas
B
absorbed into each other
C
stays the same
D
nothing
9) What type of chemical reaction releases energy in the form of heat?
A
subthermic
B
endothermic
C
geothermic
D
exothermic
10) What type of chemical reaction is the equation below. 2Fe + 6NaBr 2FeBr3 + 6Na
A
single
B
synthesis
C
double
D
decomposition
11) Combustion reactions take in which element in order to produce water and carbon dioxide?
A
oxygen
B
nitrogen
C
hydrogen
D
carbon
12) What tells you the number of atoms of each element in a compound?
A
subscript
B
product
C
reactant
D
coefficient
13) What tells you the number of compounds there are in a chemical reaction?
A
product
B
coefficient
C
subscript
D
reactant
14) ___Mg + ___HCl ---- H2 + ___MgCl
A
2Mg + 2HCl ---- H2 + 3MgCl
B
1Mg + 2HCl ---- H2 + 1MgCl
C
1Mg + 2HCl ---- H2 + 2MgCl
D
2Mg + 2HCl ---- H2 + 2MgCl
15) ___HgO --- ___Hg + O2
A
6HgO --- 3Hg + O2
B
1HgO --- 2Hg + O2
C
2HgO --- 2Hg + O2
D
1HgO --- 1Hg + O2
*select an answer for all questions
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