Thermal capacity (Heat capacity)

When a body absorbs heat, its temperature will

• increase.

• decrease.

• remains constant.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which statement defines the thermal capacity (heat capacity) of a solid body?

• the energy needed to melt the body without a change in temperature

• the energy needed to raise the temperature of the body by one degree Celsius

• the increase in the volume of the body when its temperature is raised by one degree Celsius

• the total amount of internal energy in the body

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The heat capacity of a substance depends on the followings, EXCEPT:

• mass of substance.

• type of substance.

• Quantity of heat supplied.

• ice point and steam point.

Tags

NGSS.MS-PS3-4

A substance can exist in three different states: solid, liquid or gas.

Each of the two statements below describes a change of state.

Change 1: Molecules move closer together but continue to travel throughout the substance.

Change 2: Molecules stop travelling throughout the substance and just vibrate about fixed positions.

Which changes of state do these statements describe?

• Change 1: Condensation; Change 2: Melting

• Change 1: Condensation; Change 2: Solidification

• Change 1: Solidification; Change 2: Condensation

• Change 1: Solidification; Change 2: Melting

A metal has a specific heat capacity of 360 J / (kg ⁰C). An object made of this metal has a mass of 2.0 kg.

What is the thermal capacity (heat capacity) of the object?

• 180 J / ⁰C

• 180 J / kg

• 720 J / ⁰C

• 720 J / kg

Tags

NGSS.HS-PS3-1

Temperature difference of 1 degree Celsius equivalent to a difference of

• 1 K.

• 100 K.

• 272 K.

• 274 K.

The specific heat capacity of a substance is the quantity of heat required to

• melt 1 kg of the substance.

• raise the temperature of the substance by 1⁰C.

• raise the temperature of 1 kg of the substance by 1⁰C.

Tags

NGSS.MS-PS3-4

This equation is often used to solve problems related to heat and temperature change of a substance.

• change in energy = mcΔT

• energy = ml

A liquid X of mass 1 kg requires 3800 J of heat to raise its temperature by 1⁰C.

Calculate the total heat required to raise the temperature of 1 kg of liquid X by 3⁰C.

• 3800 J

• 7600 J

• 11 400 J

Tags

NGSS.HS-PS3-1

The time taken by an electric heater to raise the temperature of 4 kg of water from 25⁰C to 30⁰C is 1 minute. If the specific heat capacity of water is 4200 J kg^{-1 o}C^-1, calculate the power of the heater.

• 70 W

• 140 W

• 700 W

• 1400 W

Tags

NGSS.HS-PS3-1