MEASUREMENT OF HEAT ENERGY

Multiple Choice

What is thermal equilibrium?

• The transfer of heat through the movement of molecules due to density differences.

• The point when substances have reached the same temperature.

• The transfer of heat through electromagnetic waves.

• The measurement that compares the amount of mass an object has to its volume.

Multiple Choice

Why does heat transfer occur from a warmer object to a cooler object?

• Because warmer objects have more energy than cooler objects

• Because cooler objects attract heat

• Because heat always moves upward

• Because objects want to reach the same temperature

Multiple Choice

Which of the following is the correct definition of heat energy?

• The energy stored in chemical bonds

• The energy transferred from a hot body to a cooler one due to temperature difference

• The energy required to move an object

• The energy stored in an electric field

Open Ended

Explain how heat energy can cause a change in the state of a substance. Provide an example.

Multiple Choice

Which of the following statements correctly differentiates between temperature and heat?

• Temperature is the total energy of a body, while heat is the degree of hotness.

• Temperature is measured in joules, while heat is measured in Kelvin.

• Temperature is the degree of hotness and coldness, while heat flows from a hotter region to a colder region due to temperature difference.

• Temperature flows from hot to cold, while heat increases when heated.

Open Ended

Describe the relationship between specific heat capacity and the amount of energy required to change the temperature of a substance.

Multiple Choice

Which of the following factors affect the heat capacity of a body?

• Shape and color

• Substance it is made of and its mass

• Temperature and pressure

• Volume and density

Multiple Choice

Which material has the highest specific heat capacity according to the table?

• Water

• Copper

• Aluminium

• Glass

Open Ended

A given quantity of heat increases the temperature of 150g of water from 9°C to 15°C and increases the temperature of an equal volume of oil weighing 100g from 9°C to 25°C. What is the ratio of the specific heat capacity of oil to that of water?

Multiple Choice

Which of the following statements best describes the method of mixtures?

• It is a method to separate mixtures based on their boiling points.

• It is a method to determine the specific heat capacity of a substance by mixing it with another substance at a different temperature.

• It is a method to measure the density of a liquid.

• It is a method to cool substances rapidly.

Fill in the Blanks

Fill in the blank: The method of mixtures is based on the principle that the heat lost by the hotter substance is

to the heat gained by the colder substance.

Multiple Choice

Which equation represents the principle of heat exchange between a hot and a cold substance?

• m_hc(θ_h - θ_f) = m_cc(θ_f - θ_i)

• m_hc(θ_h - θ_i) = m_cc(θ_f - θ_h)

• m_hc(θ_f - θ_h) = m_cc(θ_i - θ_f)

• m_hc(θ_i - θ_f) = m_cc(θ_h - θ_f)

Multiple Choice

In the example where 400g of cold water is added to 200g of water at 70°C and the final temperature is 30°C, what is being calculated?

• The final temperature of the mixture

• The initial temperature of the cold water

• The mass of the hot water

• The specific heat capacity of water

Multiple Choice

What is the ratio of mass of hot water to that of cold water supplied if a man wishes to bathe at 40°C using water from taps at 25°C and 75°C?

• 1:1

• 2:1

• 1:2

• 3:2

Fill in the Blanks

The calorimeter is usually made up of

or aluminium.

Multiple Choice

Which of the following steps is NOT part of the procedure for measuring the specific heat capacity of a solid using a calorimeter?

• Heating the solid in boiling water

• Weighing the calorimeter and stirrer empty

• Cooling the solid in ice before transferring

• Determining the final temperature of the mixture

Open Ended

Explain how the method of mixture is used to measure the specific heat capacity of a solid.

Multiple Select

Which of the following variables are needed to calculate the specific heat capacity of a solid using the calorimeter method, as described in the first image?

• Mass of the solid

• Initial temperature of the mixture

• Specific heat capacity of water

• Final temperature of the mixture

Multiple Choice

Which equation represents the law of heat exchange used to determine the specific heat capacity of a solid in a calorimeter experiment?

• mscs(θs−θf) = mcCc(θf−θi) + mwcw(θf−θi)

• Pt = mcΔθ

• mgh = mcΔθ

• Q = mcΔT

Fill in the Blanks

The specific heat capacity of water is typically about

J/kg°C.

Multiple Choice

In the electrical method for determining specific heat capacity, which of the following equations is NOT equivalent to the others?

• Pt = mcΔθ

• Ivt = mcΔθ

• I^2Rt = mcΔθ

• Q = mcΔθ

Open Ended

Describe how the temperature at the bottom of a waterfall can be slightly higher than at the top, using the concept of energy transformation.

Open Ended

Reflecting on today's lesson, what is one thing about heat energy or its transfer that you would like to learn more about or found most interesting?

Multiple Choice

What is the main difference between heat and temperature as illustrated by the transfer of heat from a warmer object to a cooler object?

• Heat is the transfer of energy due to temperature difference, while temperature measures the average kinetic energy of particles.

• Heat and temperature are the same thing.

• Temperature is the transfer of energy, while heat measures the average kinetic energy of particles.

• Heat only exists in solids, while temperature only exists in liquids.