Chemistry Review

Front

What is the atomic number of oxygen?

Back

8

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances, e.g., iron rusting.

Front

How many hydrogen atoms are in the chemical formula C4H10?

Back

4 hydrogen atoms

Front

What are electrons?

Back

Negatively charged particles that orbit the nucleus of an atom.

Front

What does the nucleus of an atom contain?

Back

Protons and neutrons.

Front

What is the charge of protons?

Back

Positively charged particles.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the role of neutrons in an atom?

Back

Neutrons help stabilize the nucleus and contribute to the atomic mass.

Front

What is the formula for calculating the number of neutrons in an atom?

Back

Number of neutrons = Atomic mass - Atomic number.

Front

What is the periodic table?

Back

A tabular arrangement of elements organized by increasing atomic number.