NEW
Font size
S
M
L
XL
WorksheetsAP Chemistry Unit 6 Thermochemistry
Total questions: 22
Worksheet time: 29mins
Name
Class
Date
1.
A reaction that releases energy is called?
a)
exothermic
b)
endothermic
c)
hypothermic
d)
hyperthermic
2.
Energy stored in the chemical bonds of the substance is called?
a)
kinetic energy
b)
chemical potential energy
c)
heat
3.
The energy that is transferred from one object to another because of a temperature difference.
a)
entropy
b)
heat
c)
themochemistry
d)
calorie
4.
Reactions that absorb heat from its surroundings are?
a)
exothermic
b)
endothermic
c)
hypothermic
d)
hyperthermic
5.
The amount of heat it takes to raise the temperature of 1 gram of a substance by 1 C.
a)
heat
b)
specific heat
c)
heat capacity
d)
joules
6.
This device is used to measure the absorption or release of heat in a chemical or physical process.
a)
calorimeter
b)
calorimetry
c)
heat capacity
d)
specific heat
7.
For an endothermic reaction, the heat is on the ____ side.
a)
reactant
b)
product
c)
either side
8.
If ∆H is negative, the reaction is?
a)
exothermic
b)
endothermic
9.
The amount of heat released or absorbed depends on the number of ____ of the reactants and products.
a)
volume
b)
moles
c)
mass
d)
chemical composition
10.
A 200 g piece of copper was heated from 25 °C to 40 °C. Its specific heat is 0.387J/g °C, what is the amount of heat absorbed?
a)
1161 Joules
b)
1161 calories
c)
3096 Joules
d)
1935 Joules
11.
Consider the reaction: 2 H2O + energy --> 2H2 + O2
a)
exothermic, releasing energy
b)
exothermic, absorbing energy
c)
endothermic, absorbing energy
d)
endothermic, releasing energy
12.
What type of reaction is shown in the reaction pathway?
a)
endothermic reaction
b)
exothermic reaction
13.
When ammonium nitrate dissolves in water, the solution gets cold. Which is true?
a)
Reaction is ENDOTHERMIC with positive ΔH
b)
Reaction is ENDOTHERMIC with -ΔH
c)
Reaction is EXOTHERMIC with a -ΔH
d)
Reaction is EXOTHERMIC with +ΔH
14.
Solid magnesium dissolves in a hydrochloric acid, releasing hydrogen gas and heat from a solution of magnesium chloride. What is the sign on ΔH for this reaction?
a)
Negative because it is exothermic
b)
Negative because it is endothermic
c)
Positive because it is exothermic
d)
Positive because it is endothermic
15.
For which of these processes is the value of ΔH expected to be positive?
1. The temperature increases when calcium chloride dissolves in water.
2. Steam condenses to liquid water
3. Water boils
4. Dry ice sublimates
1. The temperature increases when calcium chloride dissolves in water.
2. Steam condenses to liquid water
3. Water boils
4. Dry ice sublimates
a)
4 only
b)
1 only
c)
3 and 4 only
d)
2 and 3 only
16.
Which 1 g sample will have the highest temperature after the addition of 200 J of energy?
a)
H2O(l)
b)
H2O(g)
c)
Cu
d)
Pb
17.
A 5.00 gram sample of a metal at 85.0 °C comes in contact with 100.0 grams of water at 25.0 °C. What is the direction of the heat flow and why?
a)
Metal to water, since heat flows from low mass to high mass
b)
Water to metal, since heat flows from high mass to low mass
c)
Metal to water, since heat flows from high temp. to low temp.
d)
Water to metal, since heat flows from low temp. to high temp.
18.
If 5.00 grams of water is cooled from 65.2 °C to 35.6 °C, what is the heat change?
a)
619 J
b)
-619 J
c)
148 J
d)
-148 J
19.
From the following enthalpy changes,
H2 (g) + F2 (g) → 2HF (g) ∆H° = -542.2 kJ
2H2 (g) + O2 (g) → 2H2O (l) ∆H° = -571.6 kJ calculate the value of ∆H° for the reaction: 2F2 (g) + 2H2O (l) → 4HF (g) + O2 (g)
H2 (g) + F2 (g) → 2HF (g) ∆H° = -542.2 kJ
2H2 (g) + O2 (g) → 2H2O (l) ∆H° = -571.6 kJ calculate the value of ∆H° for the reaction: 2F2 (g) + 2H2O (l) → 4HF (g) + O2 (g)
a)
-1113.8 kJ
b)
-1656.0 kJ
c)
-512.8 kJ
d)
29.4 kJ
20.
Which of the following would have a nonzero enthalpy of formation?
a)
Fe(s)
b)
Br2(s)
c)
O2(g)
d)
Hg(l)
21.
Which of the following would have a standard enthalpy of formation value of zero?
a)
H2O(l)
b)
H2O(g)
c)
F2(g)
d)
O3(g)
22.
Thermodynamically favorable reactions...
a)
are very fast
b)
occur only with the addition of work
c)
occur without the addition of work
d)
are always exothermic
Reset
