Chemical Reactions and Energy
Practice Test
1.
These two elements catalyze reactions that remove pollutants in typical automobile catalytic converters.
a.
iron and copper
b.
molybdenum and sodium
c.
gold and silver
d.
platinum and rhodium
2.
If C
w
equals 4.184 J/(gx
o
C), how much heat does 235 g of water gain when its temperature rises from 20.4
o
C to 39.6
o
C?
a.
18.9 kJ
b.
1.27 × 10
6
J
c.
0.438 kJ
d.
6,630 J
3.
A coal-fired power plant converts ___________________.
a.
kinetic energy to potential energy
b.
geothermal energy to electricity
c.
electricity to wind energy
d.
chemical energy to electricity
4.
Any time energy is produced or is converted from one form to another, some is lost as _________.
a.
temperature
b.
heat
c.
mass
d.
hydrogen and oxygen
5.
The energy released or absorbed by a chemical reaction is symbolized ________________.
a.
H
products
b.
H
reaction
c.
H
reactants
d.
H
reactants
+ H
products
6.
Both exothermic and endothermic reactions require ________________.
a.
precipitation
b.
activation energy
c.
gaseous reactants
d.
solid products
7.
The _______________ in photosynthetic bacteria is/are found on membranes spread throughout the cells.
a.
Calories
b.
chlorophyll
c.
grana
d.
rhizomes
8.
An exothermic reaction has a ______________
H.
a.
negative
b.
positive
c.
high
d.
zero
9.
The two basic series of reactions that make up photosynthesis are called __________________.
a.
the light reactions and the carbon dioxide cycle
b.
the dark reactions and the nitrogen cycle
c.
the light reactions and the oxygen cycle
d.
the light reactions and the Calvin cycle
10.
The maximum energy reached during a reaction's uncatalyzed pathway is ______________ the maximum energy reached during its catalyzed pathway.
a.
much less than
b.
slightly less than
c.
greater than
d.
equal to
11.
This high-energy compound is formed during the light reactions of photosynthesis.
a.
carbon dioxide
b.
sucrose
c.
glucose
d.
ATP
12.
An exothermic reaction is one that _______________.
a.
releases heat
b.
absorbs heat
c.
neither releases nor absorbs heat
d.
produces smoke
13.
Burning 1.00 g of a subtance with a molar mass of 42.0 g/mol raises the temperature of 100.0 g of water from 17.2
o
C to 47.2
o
C. What is the heat of combustion of the substance?
a.
-527 kJ/mol
b.
-890 kJ/mol
c.
422 kJ/mol
d.
-2.71 kJ/mol
14.
A system's ____________ describes its degree of disorder.
a.
enthalpy
b.
volume
c.
energy
d.
entropy
15.
This device is used to measure the heat given off by chemical reactions.
a.
colorimeter
b.
Erlenmeyer flask
c.
calorimeter
d.
Dumas bulb
16.
A reaction is always spontaneous in the forward direction when its ________________.
a.
energy increases and entropy decreases
b.
energy increases and entropy increases
c.
energy decreases and entropy increases
d.
energy decreases and entropy decreases
17.
The low entropy of living things is maintained partially by ____________.
a.
a decrease in the entropy of the surroundings
b.
an increase in the entropy of the surroundings
c.
a decrease in the energy of the universe
d.
an increase in the energy of the living things
18.
One calorie is equal to 4.184J. How much energy in joules is supplied by a breakfast bar containing 170 nutritional calories?
a.
711 J
b.
7.11 x 10 5 J
c.
170 J
d.
1.7 x 10 5 J
19.
In photosynthesis, ________________ are formed.
a.
glucose and carbon dioxide
b.
sucrose and water
c.
glucose and oxygen
d.
fructose and nitrogen
20.
Oil and natural gas are called _____________.
a.
fossil fuels
b.
petroleum
c.
esters
d.
polymers
21.
The typical maximum efficiency of a coal-fired power plant is ______________.
a.
between 60% and 70%
b.
between 50% and 60%
c.
greater than 70%
d.
less than 40%
22.
This substance provides the carbon and oxygen for the sugars produced by photosynthesis.
a.
carbon dioxide
b.
formaldehyde
c.
methane
d.
ethanol
23.
One Calorie equals _____________.
a.
one joule
b.
one BTU
c.
one calorie
d.
one kilocalorie
24.
Plants appear green because their leaves _____________.
a.
absorb green and yellow light
b.
reflect UV light
c.
reflect green and yellow light
d.
reflect red and blue light
25.
Most of the reactions that occur during photosynthesis are _______________.
a.
double replacement
b.
exothermic
c.
thermoneutral
d.
endothermic
26.
An instant cold pack utilizes an _____________________ reaction.
a.
endothermic combustion
b.
endothermic dissolution
c.
exothermic synthesis
d.
exothermic combustion
