Calculating Thermal Energy Changes in Substances

This video tutorial by Mr. Millings explains how to calculate thermal energy changes using the thermal energy equation. It covers the concepts of specific heat capacity, mass, and temperature change, and demonstrates these through various sample problems involving different materials like water, iron, and aluminum. The video also includes a discussion on specific heat capacities of different materials and how to use this information to solve problems related to energy absorption and release.

What does a negative value of Q indicate in the thermal energy equation?

• The system is absorbing energy and heating up.

• The system is releasing energy and cooling down.

• The system is in thermal equilibrium.

• The system's mass is decreasing.

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Which of the following is NOT a component of the thermal energy equation?

• Volume of the object

• Mass of the object

• Specific heat capacity

• Change in temperature

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What does the Greek letter Delta (Δ) represent in the thermal energy equation?

• Thermal energy

• Specific heat capacity

• Change in temperature

• Mass of the object

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If the specific heat capacity of water is 4.18 J/g°C, what is the thermal energy required to heat 550 grams of water from 10°C to 90°C?

• 183,920 J

• 183.92 J

• 18,392 J

• 1,839.2 J

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What is the specific heat capacity of gold?

• 0.452 J/g°C

• 4.18 J/g°C

• 0.129 J/g°C

• 0.878 J/g°C

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Which material has a higher specific heat capacity, water or gold?

• Water

• Gold

• They have the same specific heat capacity

• It depends on the temperature

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How much thermal energy is required to heat 350 grams of iron from 20°C to 120°C?

• 15.82 J

• 158.2 J

• 15,820 J

• 1,582 J

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If 100 grams of a metal releases 4,500 J and its temperature decreases from 200°C to 100°C, what is its specific heat capacity?

• 0.452 J/g°C

• 0.387 J/g°C

• 0.450 J/g°C

• 0.129 J/g°C

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What is the mass of a piece of copper that releases 14,500 J to cool from 75°C to 5°C?

• 535.3 kilograms

• 535.3 grams

• 53.53 grams

• 5,353 grams

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If a 10.5 kg sample of aluminum absorbs 35,000 J of energy, what will its final temperature be if its initial temperature is 15°C?

• 18.8°C

• 88.8°C

• 38.8°C

• 53.8°C

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