Variables
Calculations
No Calculations Needed
Multiple Choice
100
This variable represents heat added or removed
Q
100
This is the formula that includes heat, specific heat, mass, and temperature change
Q = m c deltaT
100
Julian puts 1 kg of water and 1 kg of oil on the stove. The initial temperatures of both are 20 °C. The water takes more time to reach 40 °C than the oil. Which substance has a higher specific heat - water or oil?
Water
100
Thermal energy is added to a sample of 15°C water. Which of the following quantities must increase?
| A. | the water’s mass | |
| B. | the water’s salinity | |
| C. | the water’s specific heat | |
| D. | the water’s temperature |
D
200
This variable represents mass
m
200
What is the change in temperature of an object whose initial temperature is 40 °C and reaches a final temperature of 65 °C?
15 °C
200
Material A and Material B each absorb 500J of heat. The temperature of Material A rises more than the temperature of Material B. Which material has a greater specific heat capacity?
Material B
200
The specific heat of water is 4.2 J/g⋅°C. How much heat is required to raise the temperature of 100 g of water by 5°C?
| A. | 84 J | |
| B. | 119 J | |
| C. | 500 J | |
| D. | 2100 J |
D
300
This variable represents specific heat capacity
c
300
How much heat must be absorbed by 375 grams of water to raise its temperature by 25°C? (The specific heat of water is 4.18 J/g°C.)
39187.5 J
300
We use metal for our pots and pans. This is because metal has a high/low specific heat capacity, so its temperature changes slowly/quickly.
We use metal for our pots and pans. This is because metal has a low specific heat capacity, so its temperature changes quickly.
300
A student heats 200 g of water from 20°C to 70°C. How much heat did the student add to the water if the specific heat for water is 4.2 J/g • °C?
| A. | 10,000 J | |
| B. | 14,000 J | |
| C. | 42,000 J | |
| D. | 76,000 J |
C
400
This symbol represents change
delta
400
What mass of water can be heated from 25.0 °C to 50.0 °C by absorbing 2825 J of thermal energy? (The specific heat of water is 4.18 J/g°C.)
27g
400
Which material has a greater specific heat capacity?
Substance A
400
A student mixes 70 g of water at 80°C and 140 g of water at 20°C in an insulated cup, as shown in the diagram below.
What is the expected temperature of the water in the cup after 1 min?
| A. | 20°C | |
| B. | 40°C | |
| C. | 70°C | |
| D. | 80°C |
B
500
This variable represents temperature change
delta T
500
1840 J of heat is needed to warm 50 g of iron from 20 °C to 100 °C. What is the specific heat of iron?
0.46 J/g°C
500
Material A and Material B are put into a freezer. The temperature of Material A decreases faster than the temperature of Material B. Which material has a greater specific heat capacity?
Material B
500
Two U.S. quarters, initially at the same temperature, are heated with a flame. One of the quarters was made before 1965 and is composed of silver. The other quarter was made after 1965 and is composed mostly of copper. What information is needed to determine which quarter will heat up faster?
| A. | the specific heats of the metals and the mass of each coin | |
| B. | the initial temperature of the coins and the mass of each coin | |
| C. | the temperature of the flame and the specific heats of the metals | |
| D. | the initial temperature of the coins and the temperature of the flame |
A