Thermal Energy and Specific Heat

This video tutorial from Free Science Lessons explains how to calculate the energy stored or released in a system as its temperature changes. It introduces the concept of specific heat capacity and provides sample calculations, including heating water and an aluminium plate. The video concludes with a practice question on determining the mass of water in a hot water bottle, reinforcing the application of the specific heat capacity formula.

What is the primary focus of this video tutorial?

• Understanding chemical reactions

• Learning about electrical circuits

• Calculating energy changes in systems

• Studying the laws of motion

What does specific heat capacity refer to?

• The energy required to move an object

• The energy needed to break chemical bonds

• The energy needed to change the state of a substance

• The energy required to raise the temperature of 1 kg of a substance by 1°C

How much energy is needed to raise the temperature of 2 kg of water from 20°C to 100°C?

• 42,000 J

• 100,000 J

• 84,000 J

• 67,200 J

What is the specific heat capacity of water used in the calculations?

• 2,500 J/kg°C

• 3,500 J/kg°C

• 4,200 J/kg°C

• 5,000 J/kg°C

What is the mass of the aluminum plate in the example problem?

• 2 kg

• 1 kg

• 1.5 kg

• 3 kg

What is the specific heat capacity of aluminum used in the problem?

• 850 J/kg°C

• 920 J/kg°C

• 1,000 J/kg°C

• 913 J/kg°C

How much thermal energy is stored in the aluminum plate when heated from 20°C to 200°C?

• 246,510 J

• 200,000 J

• 300,000 J

• 150,000 J

What is the temperature change of the hot water bottle in the final problem?

• 60°C

• 80°C

• 50°C

• 70°C

How much thermal energy is released by the hot water bottle as it cools?

• 60,000 J

• 76,000 J

• 80,000 J

• 70,000 J

What is the mass of water in the hot water bottle after solving the problem?

• 2 kg

• 3 kg

• 5 kg

• 4 kg