Grade 9 Chemistry Review

Front

What determines an element's identity?

Back

The number of protons.

Front

How many neutrons does an element with a mass number of 11 and an atomic number of 5 have?

Back

6 neutrons.

Front

What is an arrangement of elements in columns called?

Back

Periodic table.

Front

What is a sign that a chemical reaction has occurred?

Back

Formation of a gas.

Front

What do elements in a group have in common?

Back

They have similar chemical properties.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus.

Front

What is a chemical reaction?

Back

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

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is the significance of the periodic table?

Back

It organizes elements based on their atomic number and properties.

Front

What is a valence electron?

Back

An electron in the outermost shell of an atom that can participate in chemical bonding.