Semester Review 2024

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What is a chemical change?

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A chemical change is a process where a substance transforms into a new substance with different properties, such as when starch is converted into simple sugars by saliva.

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition, such as grinding food into smaller pieces.

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What is Newton's First Law of Motion?

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Newton's First Law of Motion, also known as the law of inertia, states that an object at rest will stay at rest, and an object in motion will stay in motion at a constant velocity unless acted upon by a net external force.

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What is the law of action-reaction?

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The law of action-reaction states that for every action, there is an equal and opposite reaction, meaning forces always occur in pairs.

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What is the law of acceleration?

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Newton's Second Law of Motion, or the law of acceleration, states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.

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What is the law of gravity?

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Newton's law of gravity states that every mass attracts every other mass in the universe, and the force of attraction is proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

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What is an example of a physical change?

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An example of a physical change is ice melting into water; the substance remains H2O but changes its state.

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What is an example of a chemical change?

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An example of a chemical change is rust forming on iron; the iron reacts with oxygen to create a new substance, iron oxide.

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What is the difference between a physical change and a chemical change?

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A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

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What is resistive force?

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Resistive force is a force that opposes the motion of an object, such as water pushing against a salmon swimming upstream.