WorksheetsThermo Review for Final
Total questions: 49
Worksheet time: 1hrs 2mins
Name
Class
Date
1.
What does this graph represent?
a)
Exothermic Reaction
b)
Endothermic Reaction
c)
Nuclear Reaction
d)
Radiation
2.
If ΔH = -95 J
Then...
Then...
a)
The system is losing 95 J to the surroundings
b)
Both the system and surroundings are losing 95 J
c)
The system is gaining 95 J from the surroundings
d)
Both the system and surroundings are gaining 95 J
3.
Calculate the amount of energy needed to convert 250. g of ice at - 25 °C to steam at 250.°C. The specific heat of water is 4.184 J/g * °C
(Answer is in correct sig figs)
(Answer is in correct sig figs)
a)
2.88 x 105 J
b)
2.9 x 105 J
c)
287,650 J
d)
None of these
4.
Which equation would you use to solve for mass?
a)
Q = m * Cp * ΔT
b)
ΔT= Q / m * Cp
c)
M = Q/ Cp * ΔT
d)
E = mc2
5.
In an exothermic reaction:
a)
ΔH is positive because energy is gained
b)
ΔH is negative because energy is gained
c)
ΔH is positive because energy is lost
d)
ΔH is negative because energy is lost
6.
What is the term for the amount of energy absorbed or released in a chemical reaction?
a)
heat of vaporization
b)
heat of condensation
c)
heat of reaction
d)
heat of sublimation
7.
During an endothermic reaction, heat content in the surroundings decreases because:
a)
all reactions need heat energy
b)
the reaction absorbs heat energy
c)
energy is given off by the reaction
d)
heat energy is destroyed during reactions
8.
In an Endothermic Reaction, heat is transferred ____ the system, ____ the surroundings.
a)
from, to
b)
to, from
c)
from, from
d)
to, to
9.
How much heat is required to raise the temperature of a sample of copper from 10.0°C to 55.0°C, if its specific heat is 0.384 J/g°C and its mass is 10.00 g?
a)
16 J
b)
139 J
c)
173 J
d)
359 J
10.
Condensation is:
a)
The process that takes place when the average energy of a gas’s particles decreases
b)
The process that takes place when the sum of energy of a gas's particles decrease
c)
The process that takes place when the average energy of a gas’s particles increases
d)
The process that takes place when the sum of energy of a gas's particles increases
11.
What causes a phase change from liquid to gas?
a)
a chemical reaction
b)
freezing point
c)
energy exiting the system
d)
energy entering the system
12.
Heat flows from
a)
cold to hot
b)
warm to cold
c)
freezing to boiling
d)
hot to cold
13.
Which Reaction is an endothermic reaction?
a)
A
b)
B
c)
C
d)
D
14.
A 16.0 g sample of iron was heated from 0°C to 35.0°C. It absorbed 246.4 J of energy as heat. What is the specific heat of this piece of iron?
a)
240 J/g°C
b)
3.67 J/g°C
c)
1.34 J/g°C
d)
0.44 J/g°C
15.
What is the specific heat, c, (J/g·oC) of a substance if 51 J of heat are required to raise the temperature of 1.7 grams of this substance from 20.5 ºC to 25.5 ºC?
a)
- 433.5 J/g·oC
b)
6 J/g·oC
c)
-6 J/g·oC
d)
433.5 J/g·oC
16.
What does NOT happen when the temperature is increased?
a)
Particles collide more often
b)
Particles collide with more energy
c)
Particles move faster
d)
More particles collide in the correct orientation
17.
What does a catalyst do?
a)
Stabilises a reaction
b)
Increases the rate of reaction
c)
Cools the reaction down
d)
Increases the concentration of the reaction
18.
A substance with a high specific heat:
a)
Is always extremely hot.
b)
Requires a lot of energy to become hot.
c)
Is not heavy.
d)
Does not requires a lot of energy to become hot.
19.
At the beach on a hot day, the reason the water feels cool compared to the hot sand is due to which property?
a)
Mass density
b)
Temperature
c)
Specific heat
d)
Thermal conductivity
20.
The amount of thermal energy required to raise the temperature of one (1) kilogram of a substance by 1o C is known as:
a)
Specific heat
b)
Heat of fusion
c)
Heat of vaporization
d)
Melting point
21.
How much heat must be added to 0.3-kg of ice to raise its temperature by 25oC? The specific heat of water is 4186 J/kg°C.
Remember: Q=mcΔT
Remember: Q=mcΔT
a)
1.8 J
b)
18 J
c)
349 J
d)
31395 J
22.
Which is a factor that would not affect the rate of a reaction?
a)
Temperature
b)
Adding a catalyst
c)
Concentration
d)
size of the beaker in which the reaction takes place
23.
Which picture shows how a catalyst would change the rate?
a)
Option 3
b)
Option 2
c)
Option 1
24.
Which graph has the LARGEST ACTIVATION ENERGY (Ea)?
a)
A. has largest Ea
b)
B. has largest Ea
c)
C. has largest Ea
d)
E. has largest Ea
25.
The unit Joules is for ___________
a)
heat energy
b)
temperature
c)
specific heat
26.
what is an example of exothermic?
a)
firework
b)
ice pack
c)
coal
d)
wood
27.
As someone is running on the track they begin to perspire. If the runner is our system, are they endothermic or exothermic?
a)
Endothermic process
b)
Exothermic process
28.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
29.
Is the combustion of gasoline endothermic or exothermic?
a)
Endothermic
b)
Exothermic
30.
For the formula:
Q= m c ∆T
The units for specific heat are:
Q= m c ∆T
The units for specific heat are:
a)
g /J C
b)
°C/g J
c)
kJ/g
d)
J/g°C
31.
A sample of iron receives 50.J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of .10 J/g°C, what is the mass of the iron sample?
a)
25g
b)
30g
c)
20g
d)
50g
32.
How much energy does it take to freeze 39.2 g of liquid benzene? (ΔHfus = 126 J/g, ΔHvap = 394 J/g) (Show your work)
a)
4940 J
b)
-4940 J
c)
15400 J
d)
-15400 J
33.
What letter represents boiling?
a)
B
b)
C
c)
D
d)
E
34.
What letter represents a liquid being heated?
a)
A
b)
B
c)
C
d)
D
35.
What type of reaction is pictured behind?
a)
endothermic
b)
exothermic
36.
Which phase of matter has the greatest motion and least orderly arrangement?
a)
solid
b)
liquid
c)
gas
37.
what is the disorder of the system known as?
a)
efficiency
b)
fast moving particles
c)
entropy
38.
When activation energy is high, is the reaction slow or fast?
a)
slow
b)
fast
39.
What kind of reaction moves from high PE to low PE?
a)
endothermic
b)
exothermic
40.
Which of the letters (A-D) represents activation energy?
a)
A
b)
B
c)
C
d)
D
41.
Which of the letters (A-D) represents the potential energy of the reactants?
a)
A
b)
B
c)
C
d)
D
42.
Which of the letters (A-D) represents the potential energy of the products?
a)
A
b)
B
c)
C
d)
D
43.
Compared to the potential energy of the products, the potential energy of the reactants above is?
a)
greater than
b)
less than
c)
the same
d)
impossible to determine
44.
USE YOUR BURGER SHEET FOR CONVERSIONS!
If Karen eats a large curly fry and a bacon cheeseburger, how many calories from fat did she consume?
If Karen eats a large curly fry and a bacon cheeseburger, how many calories from fat did she consume?
a)
279 calories
b)
495 calories
c)
55 calories
d)
216 calories
45.
How much energy would be needed to heat 450 grams of copper metal from a temperature of 25.0ºC to a temperature of 75.0ºC? (The specific heat of copper at 25.0ºC is 0.385 J/g ºC.)
a)
4,000 J
b)
8,700 J
c)
5,000 J
d)
3,578 J
46.
If the temperature of copper starts at 15°C and increases to 100°C, what is the change in temperature?
a)
115
b)
100
c)
85
d)
15
47.
H2 + Cl2 --> 2 HCl + 1845 kJ
Is this reaction endothermic or exothermic?
Is this reaction endothermic or exothermic?
a)
Endothermic
b)
Exothermic
48.
How does a catalyst speed up reaction rates?
a)
lowering heat of the reactions
b)
lowering activation energy
c)
lowering potential energy
d)
lowering chemical energy
49.
What substances slow down or cease a reaction?
a)
halt
b)
manipulators
c)
inhibitors
100 %
