Flashcardizz S4 T9 L1 & 2 Chemical Change & Conservation of Mass

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What is a chemical change?

Back

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

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What is the law of conservation of mass?

Back

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.

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What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

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What is a coefficient in a chemical formula?

Back

A coefficient is a number placed in front of a chemical formula that indicates how many molecules or moles of that substance are present.

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What does a subscript in a chemical formula indicate?

Back

A subscript is a small number written below and to the right of an element symbol that indicates the number of atoms of that element in a molecule.

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Example of a physical change?

Back

Crumpling paper is an example of a physical change.

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Example of a chemical change?

Back

Rust forming on iron is an example of a chemical change.

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What happens during a chemical reaction?

Back

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

Front

What is the difference between a reactant and a product?

Back

Reactants are the starting substances in a chemical reaction, while products are the substances formed as a result of the reaction.

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How do you calculate the total mass of products in a reaction?

Back

To calculate the total mass of products, add the masses of all reactants together, as per the law of conservation of mass.