Physical Science

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What is heat energy?

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Heat energy is a form of energy that is transferred between systems or objects with different temperatures (thermal energy). It flows from the hotter object to the cooler one.

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What is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances with different properties, often accompanied by fizzing, foaming, or burning.

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What is the law of conservation of energy?

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The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.

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What happens to heat energy when a hot object is placed on a cold surface?

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Heat energy transfers from the hot object to the cold surface until thermal equilibrium is reached.

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What is an example of a physical change?

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An example of a physical change is melting ice into water, where the substance changes form but not its chemical composition.

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What is the difference between heat and temperature?

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Heat is the total energy of molecular motion in a substance, while temperature is a measure of the average kinetic energy of the molecules.

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What is radiant energy?

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Radiant energy is energy that travels by waves or particles, particularly electromagnetic radiation such as light.

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What is an example of energy transformation?

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An example of energy transformation is a light bulb converting electrical energy into light and heat energy.

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What is thermal equilibrium?

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Thermal equilibrium is the state in which two objects in contact with each other reach the same temperature and no heat flows between them.

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What is an endothermic reaction?

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An endothermic reaction is a chemical reaction that absorbs heat from its surroundings, resulting in a temperature drop.

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