Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

What is a compound?

Back

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

Front

How many elements are in the compound C2H8O?

Back

3 (Carbon, Hydrogen, and Oxygen).

Front

Is O2 a compound molecule?

Back

FALSE (O2 is a diatomic molecule, not a compound, as it consists of only one type of element).

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of the element in a molecule.

Front

How many oxygen atoms are in H2O?

Back

1.

Front

What is the total number of atoms in the formula H2O2?

Back

4 (2 Hydrogen and 2 Oxygen).

Front

What is the chemical symbol for Oxygen?

Back

O.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

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.