Physical, Chemical, and Nuclear Change

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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. Examples include changes in state (like melting or freezing) and changes in shape or size.

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What is a chemical change?

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A chemical change occurs when a substance transforms into a different substance with different properties. This often involves a chemical reaction, such as rusting or burning.

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What is a nuclear change?

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A nuclear change involves changes in the nucleus of an atom, leading to the formation of different elements or isotopes. This can occur through processes like radioactive decay or nuclear fission.

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What is a mixture of elements and compounds?

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A mixture of elements and compounds consists of two or more substances that are physically combined but not chemically bonded. Each substance retains its own properties.

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What is the difference between an exothermic and endothermic reaction?

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An exothermic reaction releases heat to the surroundings, while an endothermic reaction absorbs heat from the surroundings.

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What is activation energy?

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Activation energy is the minimum amount of energy required to initiate a chemical reaction.

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What does a particle diagram represent in chemistry?

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A particle diagram visually represents the arrangement and interaction of particles in a substance, helping to illustrate physical and chemical changes.

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What is a compound?

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A compound is a substance formed when two or more elements are chemically bonded together in a fixed ratio.

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

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What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.