CI2: Compounds and Elements

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen (H), oxygen (O), and carbon (C).

Front

Which of the following represents an element? H2O, H2, NaCl, CaCO3

Back

H2

Front

What cannot be broken down into other substances?

Back

An element cannot be broken down into other substances.

Front

How many different elements are in the formulas CaCO3, NaHCO3, MgSO4?

Back

There are 7 different elements in these formulas.

Front

Which of the following is an example of a chemical element? sodium chloride (NaCl), water (H2O), nitrogen (N), glucose (C6H12O6)

Back

Nitrogen (N) is an example of a chemical element.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. Examples include water (H2O) and sodium chloride (NaCl).

Front

Which of the following is not a compound? HCl, Cl, NaCl, CO2

Back

Cl is not a compound; it is an element.

Front

What is the difference between an element and a compound?

Back

An element is a single type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Examples include air and salad.

Front

Can compounds be broken down into simpler substances?

Back

Yes, compounds can be broken down into simpler substances through chemical reactions.