Matter, Atoms, Molecules, and Compounds

Front

What are the building blocks of all matter?

Back

Atoms are the basic units of matter that make up everything around us.

Front

Where is most of the mass of the atom located?

Back

Most of the mass of an atom is located in the nucleus, which contains protons and neutrons.

Front

The smallest unit of an element is a(n) ______________________.

Back

Atom.

Front

Which of the following is NOT an example of a compound? O2, H2O, C6H12O6, NH4

Back

O2 is not a compound; it is a diatomic molecule.

Front

An ordinary atom has an equal number of protons and electrons. True or False?

Back

True.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together.

Front

What is a compound?

Back

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

Front

What particles are found in the nucleus of an atom?

Back

The nucleus contains protons and neutrons.

Front

What charge do protons have?

Back

Protons have a positive charge.

Front

What charge do electrons have?

Back

Electrons have a negative charge.