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Physical Science
Test Description: Ch. 7 Chemical Reactions
Instructions: Answer all questions to get your test result.
1) In the following equation, what are the reactants? NaHCO3 + HCl = NaCl + H2O + CO2
A
NaHCO3 and HCl
B
HCl and NaCl
C
NaCl, H2O, and CO2
D
NaHCO3 and NaCl
2) Which of the following is a statement of the law of conservation of mass?
A
mass is neither created nor destroyed
B
mass is created but not destroyed
C
mass is both created and destroyed, depending on the chemical reaction
D
mass is destroyed but not created
3) The mass of a hydrogen atom is 1.0 amu, and the mass of a carbon atom is 12.0 amu. What is the molar mass of methane, CH4?
A
13.0 g
B
16.0 g
C
13.0 amu
D
16.0 amu
4) In what type of reaction does one reactant form two or more products?
A
decomposition
B
single replacement
C
synthesis
D
double replacement
5) What particle is transferred from one atom to another in a redox reaction?
A
proton
B
electron
C
nucleus
D
neutron
6) Which of the following is a single replacement?
A
H2O + CO2 = H2CO3
B
2Na + 2H2O = H2 + 1NaOH
C
2C2H6 + 7O2 = 4CO2 + 6H2O
D
KOH + HCl = KCl + H2O
7) How are reactions related to chemical bonds?
A
Bonds are formed in both the reactants and the products.
B
Bonds in the reactants are broken, and bonds in the products are formed.
C
Bonds in the products are broken, and bonds in the reactants are formed.
D
Bonds in both the reactants and products are broken.
8) What type of reaction always releases energy?
A
decomposition
B
oxidation-reduction
C
endothermic
D
exothermic
9) In general, an increase in temperature
A
does not affect reaction rate
B
acts as a catalyst
C
decreases reaction rate
D
increases reaction rate
10) What takes place at chemical equilibrium?
A
Reactants form more quickly than products
B
Reactants and products stop forming
C
Products form more quickly than reactants
D
Reactants and products form at the same rate
*select an answer for all questions
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