Test Answers

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Which of these indicates that a liquid has transferred thermal energy to the air?

A
The liquid increases in temperature, and its particles lose kinetic energy.
B
The liquid decreases in temperature, and its particles gain kinetic energy.
C
The liquid increases in temperature, and its particles gain kinetic energy.
D
The liquid decreases in temperature, and its particles lose kinetic energy.
3

Heat transfer between two substances is affected by specific heat and the

A
chemical composition of the substances.
B
state of matter of the substances at room temperature.
C
thermal equilibrium of the substances.
D
amount of time and area of physical contact between the substances.
4

Nuclear reactions in a reactor produce a lot of thermal energy. That energy then flows and warms up water, which boils and produces steam. The steam then turns turbines that generate electricity.

A
Heat flows in the form of electricity.
B
Heat flows from the reactor to the water.
C
The water produces heat.
D
The steam produces heat.
6

Which shows the formula for converting from degrees Celsius to degrees Fahrenheit?

A
°F = (9/5 × °C) +32
B
°F = 5/9 × (°C – 32)
C
°F = °C – 273
D
°F = °C + 273
7

A stovetop burner on medium reaches 95°C. Which will also receive a flow of heat directly from the burner?

A
the surrounding air
B
a burner at the same temperature
C
a pan heated to 100°C
D
hotter water inside a pan
9

Barbara is converting 78°F to degrees Celsius. First, she subtracts 32 from 78. What is the next step?

A
multiply 46 by 5/9
B
multiply 46 by 9/5
C
add 273 to 46
D
subtract 273 from 46
10

The metal aluminum coils in an air conditioner conduct thermal energy from inside the house and release it outside the house. What can be said about the coils when they are accepting the heat inside the house?

A
They must be warmer than the air inside the house.
B
They must be cooler than the air inside the house.
C
They must have more thermal energy than the air inside the house.
D
They must be more insulated than the air inside the house.
11

Juan measured the temperature of salt water. He then added 273 temperature units to the measured temperature value. Which temperature conversion is Juan most likely doing?

A
degrees Celsius to degrees Fahrenheit
B
degrees Celsius to kelvins
C
kelvins to degrees Celsius
D
degrees Fahrenheit to degrees Celsius
12

A thermometer is placed in water in order to measure the water’s temperature. What would cause the liquid in the thermometer to rise?

A
The molecules in the water move closer together.
B
The molecules in the thermometer’s liquid spread apart.
C
The kinetic energy of the water molecules decreases.
D
The kinetic energy of the thermometer’s liquid molecules decreases.
13

Which substance is most likely to heat up the fastest?

A
water (specific heat of 4.19 J/g • C°)
B
copper (specific heat of 0.39 J/g • C°)
C
aluminum (specific heat of 0.90 J/g • C°)
D
dry air (specific heat of 1.01 J/g • C°)
14

Isaac wants to make s'mores. He holds a marshmallow on a metal skewer over a fire. A few seconds later, the marshmallow is cooked and the skewer feels warm. What most likely happened?

A
The fire heated the surrounding air, which cooked the marshmallow.
B
The heat generated from the marshmallow flowed in the form of thermal energy to the skewer and fire.
C
The heat from the skewer cooked the marshmallow.
D
Thermal energy in the form of heat moved from the fire to the skewer and marshmallow.
15

Hot coffee in a mug cools over time and the mug warms up. Which describes the energy in this system?

A
The average kinetic energy of the particles in the mug decreases.
B
The average kinetic energy of the particles in the coffee increases.
C
Thermal energy from the mug is transferred to the coffee.
D
Thermal energy from the coffee is transferred to the mug.
16

Which best explains why water boils in a pot sitting over fire?

A
Heat energy is created from the thermal energy in the air.
B
Heat energy is transferred from the water to the fire.
C
Thermal energy from the fire moves to the water in the form of heat.
D
Thermal energy from the surrounding air moves to the water.
17

The diagrams show the movement of particles for two substances.Which best compares the temperatures of the substances?

Question illustration
A
Substance X has the highest temperature because its particles have more kinetic energy.
B
Substance X has the highest temperature because it has fewer particles.
C
Substance Y has the highest temperature because its particles have more kinetic energy.
D
Substance Y has the highest temperature because it has more particles.
19

Ixchelt burns her tongue when she takes a sip of hot coffee from her mug. Which part of this example represents heat?

A
the thermal energy moving from the coffee to her tongue
B
the thermal energy moving from her tongue to the coffee
C
her coffee
D
her tongue
20

What happens when the thermal energy of a substance increases?

A
The motion of the particles in the substance increases, and the temperature of the substance decreases.
B
The motion of the particles in the substance decreases, and the temperature of the substance increases.
C
Both the motion of the particles in the substance and the temperature of the substance decrease.
D
Both the motion of the particles in the substance and the temperature of the substance increase.

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