6.6E Evidence of Chemical Change

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What is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances with different properties.

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What are some signs that a chemical reaction has occurred?

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Signs of a chemical reaction include: formation of a gas, color change, temperature change, and formation of a precipitate.

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What is rusting?

Back

Rusting is a chemical reaction that occurs when iron reacts with oxygen and moisture, forming iron oxide (rust).

Front

What does it mean when a gas is formed during a reaction?

Back

The formation of a gas indicates that a chemical reaction has occurred, often resulting in new substances being produced.

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What is a precipitate?

Back

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

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How can temperature changes indicate a chemical reaction?

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A temperature change during a reaction suggests that energy is being absorbed or released, indicating a chemical change.

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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 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 an example of a chemical change?

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An example of a chemical change is the reaction of vinegar and baking soda, which produces carbon dioxide gas.

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What happens to the mass of substances during a chemical reaction?

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The mass of the substances before and after a chemical reaction remains the same, according to the law of conservation of mass.

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What is the role of energy in chemical reactions?

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Energy is either absorbed or released during chemical reactions, which can cause temperature changes.