2024 Unit 1 Chemistry Test Review

Front

What is a chemical reaction?

Back

A process in which substances (reactants) are transformed into new substances (products) through the breaking and forming of chemical bonds.

Front

What is a product in a chemical reaction?

Back

The new substance(s) formed as a result of a chemical reaction.

Front

Define the term 'property' in chemistry.

Back

A unique characteristic that helps identify a substance, such as color, density, melting point, and boiling point.

Front

What is a mixture?

Back

A combination of two or more substances that do not chemically combine and can be separated by physical means.

Front

How do you determine the number of atoms in a chemical reaction?

Back

By using the law of conservation of mass, which states that the total mass of reactants must equal the total mass of products.

Front

What is the law of conservation of mass?

Back

A fundamental principle stating that matter cannot be created or destroyed in a chemical reaction.

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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What does it mean for a substance to be chemically combined?

Back

It means that the atoms of the substances have reacted to form new chemical bonds, resulting in a new substance.

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the number of atoms for each element is the same on both sides of the equation, adhering to the law of conservation of mass.

Front

What is an example of a physical change?

Back

Melting ice or boiling water, where the substance changes state but not its chemical composition.