Water & P vs C Change & Conservation of Matter

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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 melting, freezing, and dissolving.

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. Examples include burning, rusting, and cooking.

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What is the pH value of pure water?

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The pH value of pure water is 7, which is considered neutral.

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What does the law of conservation of mass state?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it is only transformed into different substances.

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What are reactants in a chemical reaction?

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Reactants are the starting substances in a chemical reaction that undergo change to form products.

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What are products in a chemical reaction?

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Products are the substances that are formed as a result of a chemical reaction.

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What happens to the atoms in a chemical reaction?

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In a chemical reaction, atoms are rearranged to form new substances, but the total number of atoms remains the same.

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What is an example of a chemical change?

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An example of a chemical change is a firework display, where chemical reactions produce light, sound, and heat.

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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.

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

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A physical property can be observed without changing the substance's identity (e.g., color, melting point), while a chemical property describes a substance's ability to undergo a chemical change (e.g., flammability).