Question detail

What is internal energy defined as?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Internal energy and energy transfers

Question

A. The total kinetic energy and potential energy of all particles in a system
B. The energy stored in a single particle
C. The energy required to change the temperature of a substance
D. The energy lost during a phase change

Answer

The correct answer is The total kinetic energy and potential energy of all particles in a system.

Explanation

Definition lens: Give the precise definition, then add a context sentence that shows how it is used. This question asks: What is internal energy defined as. The correct response is The total kinetic energy and potential energy of all particles in a system, because changes of state are explained by particle energy and arrangement. In Internal energy, the marking point should connect directly to apply the conservation of energy idea to heating and changes of state. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Internal energy and energy transfers, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 270 is distinct because it uses this exact question context and the definition lens rather than a generic particle-model sentence.

Common mistake

Confusing Energy Transfer with Temperature Change

Students often think that when energy is transferred to a system, the temperature must always increase.

Understand that energy transfer can change the state of a substance without changing its temperature, such as during melting or boiling.

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