Font size
WorksheetsUnit 3 Review
Total questions: 25
Worksheet time: 1hrs 1mins
In which region(s) does temperature increase?
Region C only
Regions B and D
Regions A, C, and E
Regions A and B
In a heating curve, diagonal lines indicate temperature is __________, while flat lines indicate temperature is __________.
Constant, changing
Changing, constant
Describe the substance at letter A.
Solid
Liquid
Melting
Evaporating
The melting point of the sample is
-60 ºC
20 ºC
60 ºC
100 ºC
In which region(s) of the heating curve would water be a liquid and a gas at the same time?
A
B
C
D
E
Given the heating curve for water, during which line segment could I find water in both the solid and liquid phase at the same time?
AB
BC
CD
DE
EF
This curve indicates what about the heat energy?
Heat energy is being added or absorbed
Heat energy is being released
What is the condensation (boiling) point of the substance?
0oC
60oC
120oC
180oC
From point A to point F, the sample is going through an __________ process by __________.
exothermic, releasing heat to the surroundings
exothermic, absorbing heat from the surroundings
endothermic, releasing heat to the surroundings
endothermic, absorbing heat from the surroundings
When a substance is cooled its thermal energy
increases
decreases
does not change
When a substance boils its phase energy
increases
decreases
stays the same
While a substance freezes its thermal energy
increases
decreases
stays the same
What happens to the temperature of a substance at boiling point?
decreases
increases
stays the same
Which situations are exothermic?
melting
freezing
condensing
evaporating
Which situations are endothermic?
melting
freezing
condensing
evaporating
What is the unit of the physical quantity of heat?
Meter
Watts
Joules
Joules per second
When a piece of aluminum foil is taken out of the oven and cools from 100°C to 50°C, what is the change in temperature?
-50°
50°
If the specific heat of water is 4.18 J/g∙°C, how much heat is required to increase the temperature of 1,200 g of water from 23°C to 39°C?
-80,256 J
80.256 J
80,256 J
-80.256 J
A sample of iron receives 50 J of heat energy that raises the temperature of the iron by 25°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample?
25g
30g
20g
50g
How many Joules of energy are required to make 50 grams of ice at 0οC completely melt?
334 J
0 J
113,000 J
16,700 J
Calculate the energy needed to completely boil away 30 g of water at 100⁰C .
67,800 J
2260 J
10,020 J
12,540 J
When a piece of metal at 30°C is heated to 200°C, what is the change in temperature?
50°C
170°C
-170°C
150°C
What is(are) the unit(s) for Specific Heat Capacity (Cp)?
J
J/g
J/g°C
°C
What happened to the cup of coffee according to the energy bar chart?
it was heated up in the microwave
it cooled down on a counter
nothing happened
it was frozen
