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Unit 3 Test Review (Thermo)

Total questions: 50

Worksheet time: 35mins

Name
Class
Date
1.
The specific heat of aluminum is 0.21 cal/g°C.  How much heat(Q) is released when a 10 g piece of aluminum foil is taken out of the oven and cools from 100° to 50°?
a)
105 J
b)
10.5 J
c)
1.05 J
2.
20 g of water. specific heat of water is 4.18 J/x°C.  temperature changes from 25° C to 20° C, how much heat energy (Q) moves from the water to the surroundings?
a)
418 Joules
b)
209 J
c)
83 J
d)
4.18 J
3.
A material was cooled from 100ºC to 40ºC.  What is the temperature change?
a)
60ºC
b)
40ºC
c)
-60ºC
d)
-40ºC
4.
Water has a specific heat of 4184 J/KgºC.  Wood has a specific heat of 1760 J/KgºC.  What material needs more energy to raise the temperature 1ºC
a)
Wood
b)
Water
c)
Both are the same
5.
The temperature of an unknown piece of metal with a mass of 30.00 g changes from 25.0 °C to 35.0 °C when the metal absorbs 350.0 J of energy. What is the specific heat of the metal?
a)
1.17 J/g°C
b)
-1.17 J/g°C
c)
0.857 J/g°C
d)
-0.857 J/g°C
6.
What is the symbol for Specific Heat
a)
Q
b)
t
c)
m
d)
C
7.
Copper, Stainless Steel, Carbon Steel, and Zinc were all heated using the same thermal energy.  What material would be the coolest after being heated?
a)
Copper
b)
Carbon Steel
c)
Zinc
d)
Stainless Steel
8.
A 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°C to 175°C.  Calculate the specific heat capacity of iron.    
a)
0.46 J/gxoC
b)
1.654 J/gxoC
c)
2,567,446.875 J/gxoC
9.
A high specific heat means...
a)
It heats up quickly with energy added
b)
It requires more energy to change temperature
10.
For a skillet, used for cooking, do you want a high or low specific heat
a)
High, so that it will need more energy to heat up
b)
Low, so that it will change temperature quickly
11.

Which represents a decrease in entropy?

a)

sublimation of CO2

b)

boiling water

c)

condensation of steam on cold glass

d)

NaCl dissolving in water

12.

Which of these have a DECREASE in entropy?

a)

CaCO3(s) → CaO(s) + CO2(g)

b)

2NO2(g) → N2O4(g)

c)

2NH3(g) → 3H2(g) + N2(g)

d)

C6H6(l) → C6H6(g)

13.
A reaction has a positive ΔH and a positive ΔS. Which of the following is true?
a)
It will be spontaneous at all temperatures.
b)
It will be nonspontaneous at all temperatures.
c)
It will be spontaneous at low temperatures.
d)
It will be spontaneous at high temperatures.
14.

A reaction that releases energy is

a)

Exothermic

b)

Endothermic

c)

Could be either

15.

A reaction that absorbs energy is

a)

Exothermic

b)

Endothermic

c)

Could be either

16.

Which phase change represents a decrease in entropy?

a)

solid to liquid

b)

gas to liquid

c)

liquid to gas

d)

solid to gas

17.

Which involves an increase in entropy? (if needed, select more than one answer)

a)

lowering the thermostat

b)

cleaning your locker

c)

dropping an egg on the floor

d)

arranging a deck of cards by suit

18.

As NaCl dissolves according to the equation

NaCl(s) → Na+(aq) + Cl-(aq), the entropy of the system

a)

Increases

b)

Decreases

c)

Remains the same

19.
Spontaneous reactions may be extremely slow.
a)
True
b)
False
20.
Gases have more entropy than liquids.
a)
True
b)
False
21.
An increase in  numbers of moles from reactants to products (e.g. 3A  --> 4 B) would cause a decrease in entropy.
a)
True
b)
False
22.
For the following reaction indicate if entropy is increased or decreased.     KClO3(s)  ------>  KCl(s)  +  O2(g) 
a)
increase
b)
decrease
23.

If H is negative

a)

heat is absorbed

b)

heat is released

c)

there is disorder

d)

there is less disorder

24.

Third Law of Thermodynamics discusses

a)

thermal equilibrium

b)

conservation of energy

c)

the universe gravitating towards disorder

d)

perfect order is at absolute zero

25.

Second Law of Thermodynamics discusses

a)

thermal equilibrium

b)

conservation of energy

c)

the universe gravitating towards disorder

d)

perfect order is at absolute zero

26.

First Law of Thermodynamics discusses

a)

thermal equilibrium

b)

conservation of energy

c)

the universe gravitating towards disorder

d)

perfect order is at absolute zero

27.

Zeroth Law of Thermodynamics discusses

a)

thermal equilibrium

b)

conservation of energy

c)

the universe gravitating towards disorder

d)

perfect order is at absolute zero

28.

Lighting a match is a nonspontaneous reaction

a)

True

b)

False

29.

Photosynthesis is a spontaneous reaction (photosynthesis is endothermic and orderly)

a)

True

b)

False

c)

True at low temperatures

d)

True at high temperatures

30.

Rusting a iron is spontaneous reaction (rusting an iron is exothermic and orderly)

a)

True

b)

False

c)

True at high temperatures

d)

True at low temperatures

31.

A combustion reaction is a spontaneous reaction (exothermic and disorderly)

a)

True

b)

False

c)

True at high temperatures

d)

True at low temperatures

32.

Melting is a spontaneous reaction (endothermic and disorderly)

a)

True

b)

False

c)

True at high temperatures

d)

True at low temperatures

33.
What kind of heat transfer happens when the sun is heating your body?
a)
Conduction
b)
Radiation
c)
Convection
d)
Density
34.
Ironing a shirt is an example of...
a)
condensation
b)
conduction
c)
convection
d)
radiation
35.
Warm air is __________ dense than cold air and rises creating convection currents.
a)
more
b)
less
36.
What happens when ice cubes melt in a glass?
a)
Heat travels from the ice to the warmer water.
b)
No energy is transferred.
c)
Heat is transferred from the warmer water to the ice cubes.
d)
The water warms up due to the humidity
37.
The baby chickens are kept warm from the heat lamps demonstrates this type of heat transfer. 
a)
conduction
b)
convection
c)
radiation
38.
In a swimming pool, water near the surface is slightly warmer. The warm water rises because of
a)
conduction
b)
convection
c)
radiation
39.

You lay on a hot rock at night and keep warm from the rock by

a)

conduction

b)

convection

c)

radiation

40.

A melting snowman is

a)

Exothermic

b)

Endothermic

41.

A hand warmer is

a)

Endothermic

b)

Exothermic

42.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
43.

A fireplace burning is

a)

Endothermic

b)

Exothermic

44.
When iron nails get rusty, heat is released.  What process is this?
a)
Exothermic
b)
Endothermic
45.
During an endothermic reaction in a beaker, the outside of the beaker would feel...?
a)
Warm
b)
Cold
46.

Is photosynthesis an Exothermic or an Endothermic reaction? (flower is the perspective)

a)

Endothermic

b)

Exothermic

47.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
c)
None of these 
48.

In both 3d printing and baking, when you leave your medium (model or baking sheet) out to cool off, your medium will be _____________ and thus, ____________

a)

releasing heat, exothermic

b)

releasing heat, endothermic

c)

taking in heat, endothermic

d)

taking in heat, exothermic

49.

When welding, the welding machine is ________ giving heat to the piece of metal which is ___________

a)

endothermic, exothermic

b)

endothermic, endothermic

c)

exothermic, exothermic

d)

exothermic, endothermic

50.

Between boiling and evaporation, which one is a spontaneous process from going from liquid to gas?

a)

boiling

b)

evaporation

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