Physical & Chemical Changes

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What is a chemical change?

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A chemical change is a process where substances transform into different substances with new chemical properties, often accompanied by energy changes, gas production, or color changes.

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What is a physical change?

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A physical change is a process that alters the form or appearance of a substance without changing its chemical composition, such as changes in state, shape, or size.

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What are indicators of a chemical change?

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Indicators of a chemical change include color change, gas production, formation of a precipitate, temperature change, and change in odor.

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

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A physical change affects only the physical properties of a substance, while a chemical change results in the formation of new substances with different chemical properties.

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Can a physical change be reversed?

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Yes, many physical changes are reversible, such as melting and freezing, while chemical changes are often irreversible.

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What happens to the molecules during a chemical change?

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During a chemical change, the bonds between atoms in molecules are broken and new bonds are formed, resulting in the creation of new substances.

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Give 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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Give an example of a chemical change.

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An example of a chemical change is iron rusting when it reacts with oxygen in the presence of moisture.

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What is a precipitate?

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A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

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What is meant by conservation of mass in chemical reactions?

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The conservation of mass states that in a chemical reaction, the total mass of the reactants equals the total mass of the products.

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