Chemical Changes (U6L3)

Front

What are reactants in a chemical equation?

Back

Reactants are the substances that undergo a chemical change in a reaction, found on the left side of a chemical equation.

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What is the law of conservation of mass?

Back

The law of conservation of mass states that the total mass of reactants in a chemical reaction is equal to the total mass of the products.

Front

What is a chemical reaction?

Back

A chemical reaction is a process where substances (reactants) are transformed into new substances (products) with different properties.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together.

Front

What is the pH scale?

Back

The pH scale measures how acidic or basic a solution is, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral.

Front

What happens to the mass during a chemical reaction?

Back

The mass is conserved; it does not change during a chemical reaction.

Front

What is an acid?

Back

An acid is a substance that has a pH less than 7 and can donate protons (H+) in a solution.

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What is a base?

Back

A base is a substance that has a pH greater than 7 and can accept protons (H+) in a solution.

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What is an example of a chemical change?

Back

An example of a chemical change is a candle burning, where wax is transformed into carbon dioxide and water.

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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.