Unit 1 study guide: chemical reactions

Front

What are the substances at the start of a chemical reaction called?

Back

Reactants are the substances that undergo a chemical change in a reaction.

Front

What is a substance made of one type of material throughout?

Back

A substance is a form of matter that has a uniform and definite composition.

Front

What is the definition of density?

Back

Density is how much stuff is in a space, calculated as the mass of a substance divided by its volume.

Front

Given the reaction @@CH_{4} + 2O_{2} ightarrow ??@@, which product cannot be formed?

Back

Front

What does the conservation of mass state?

Back

The conservation of mass states that the mass of the starting system must equal the mass of the ending system.

Front

Why might the mass of a system decrease during a reaction?

Back

The mass may decrease if gas bubbles escape from the system, as they have mass.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Front

What is a product in a chemical reaction?

Back

Products are the substances that are formed as a result of a chemical reaction.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each retains its own properties.

Front

What is an atom?

Back

An atom is the smallest unit of a chemical element, consisting of protons, neutrons, and electrons.