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Chemical Reactions Review (8b)
Test Description: This review is for the Chemical Reactions test for Unit 3 in Physical Science.
Instructions: Answer all questions to get your test result.
1) Which is the product in the chemical formula N + O2 yields NO2?
A
N
B
O2
C
NO2
2) What bond is between a metal and nonmetal?
A
covalent
B
ionic
C
metallic
3) When do you use prefixes in the naming of a compound?
A
when you have two nonmetals
B
when you have a metal and nonmetal
C
when you have two metals
4) Which of the following is an example of a chemical reaction?
A
ice melting in a glass of water
B
paper turning soft when wet
C
leaves changing colors in the fall
D
salt crystals forming as sea water evaporates
5) Which of the following chemical reactions illustrates a synthesis reaction?
A
H2 + O2 yields H2O
B
H2O yields H2 + O2
C
KI + Cl2 yields KCl and I2
6) Which of the following states the law of conservation of mass?
A
Two compounds combine to form a new compound with different properties
B
Mass cannot be created or destroyed in a chemical reaction
C
Energy is neither created or destroyed in a chemical reaction
D
Atoms are rearranged in a chemical reaction and some join new molecules
7) What is the force that holds atoms together called?
A
chemical solution
B
chemical mixture
C
chemical bond
D
chemical reaction
8) What charge does chlorine have?
A
+7
B
-2
C
+1
D
-1
9) Nitrogen dioxide is a covalent compound. How many oxygen atoms are in a nitrogen dioxide molecule?
A
1
B
0
C
2
D
3
10) How do substances form during a chemical reaction?
A
Chemical bonds break atoms rearrange and new chemical bonds form
B
Chemical bonds in molecules add atoms to make more molecules
C
A solid substance is formed in a solution
D
One or more substances are combined
11) How many carbon atoms are in this glucose molecule? C6H12O6
A
12
B
3
C
6
D
24
12) What is the formula for carbon dioxide?
A
CH
B
CO
C
CO2
D
CH2
13) Which of the following will NOT increase the rate of a chemical reaction?
A
increasing the concentration of reactants
B
increasing the surface area of a solid reactant
C
adding a catalyst
D
adding an inhibitor
14) In which kind of chemical reaction do two or more substances combine to form one new compound?
A
synthesis reaction
B
decomposition reaction
C
double-displacement
D
single-displacement reaction
15) Which of the following is PROOF that a chemical reaction has taken place?
A
a substance becomes noticeably warmer
B
a new substance with different properties is formed
C
a solid forms in a liquid
D
the color of a liquid changes
16) In a single-displacement reaction
A
only metals and nonmetals can react
B
most often nonmetals are involved
C
a less reactive element can replace a more reactive element
D
a more reactive element can replace a less reactive element
17) In a ______________________ reaction ions in different compounds switch places.
A
coefficient
B
covalent compound
C
single replacment
D
ionic compound
18) When a metal and a nonmetal are in a compound it is called a _____________________________.
A
ionic compound
B
coefficient
C
covalent compound
D
single replacement
19) A(n) _________________ is used to balance chemical equations.
A
coefficient
B
ionic compound
C
covalent compound
D
single replacement
*select an answer for all questions
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