*Unit 1.5-Conservation of Mass & Physical/Chemical Change

Front

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.

Front

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. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and includes processes like burning, rusting, and digestion.

Front

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

Back

The mass of substances remains constant during a chemical reaction, as per the Law of Conservation of Mass.

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.

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What is a product?

Back

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

Front

Is melting ice a physical or chemical change?

Back

Melting ice is a physical change because it changes the state of water from solid to liquid without altering its chemical composition.

Front

Is rusting of iron a physical or chemical change?

Back

Rusting of iron is a chemical change because it involves a reaction with oxygen to form a new substance, iron oxide.

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What is an example of a physical change?

Back

An example of a physical change is breaking a glass. The glass is still glass, just in smaller pieces.

Front

What is an example of a chemical change?

Back

An example of a chemical change is baking a cake. The ingredients undergo a chemical reaction to form a new product.