Unit 3 Chemical Reactions Review

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 property?

Back

A physical property is a characteristic of a substance that can be observed or measured without changing its identity, such as color, odor, hardness, and conductivity.

Front

What is a chemical property?

Back

A chemical property is a characteristic of a substance that describes its ability to undergo a specific chemical change, such as reactivity with acid.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H₂O, which indicates that each molecule contains two hydrogen atoms and one oxygen atom.

Front

How many hydrogen atoms are in H₂O?

Back

There are 2 hydrogen atoms in one molecule of H₂O.

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, such as melting or hammering wood.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, such as rusting iron or burning wood.

Front

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

Back

The total mass of the reactants remains the same before and after the chemical reaction, according to the law of conservation of mass.

Front

What is the product of the reaction between copper (Cu) and chlorine (Cl₂)?

Back

The product of the reaction between copper and chlorine is copper(II) chloride (CuCl₂).

Front

What is the difference between a reactant and a product?

Back

A reactant is a substance that undergoes a chemical change in a reaction, while a product is a substance that is formed as a result of that reaction.