Chemical Reactions Critical Juncture

Front

What is a chemical reaction?

Back

A chemical reaction is a process in which substances (reactants) undergo a transformation to form new substances (products) with different properties.

Front

What are the signs of a chemical reaction?

Back

Signs of a chemical reaction include color change, temperature change, gas production, formation of a precipitate, and change in smell.

Front

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.

Front

What is a reactant?

Back

A reactant is a substance that is present at the start of a chemical reaction and is consumed during the reaction.

Front

What is a product?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

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.

Front

What is a molecule?

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A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

Front

What is an atom?

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An atom is the basic unit of a chemical element, consisting of a nucleus surrounded by electrons.

Front

What is a compound?

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A compound is a substance formed when two or more different elements chemically bond together in fixed proportions.

Front

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.