Chemistry Review

Front

What does a subscript number in a chemical formula indicate?

Back

The number of atoms of each element in a molecule.

Front

What are the main elements that support life on Earth?

Back

Carbon, Hydrogen, Oxygen, and Nitrogen.

Front

What two elements combine to form water?

Back

Hydrogen and Oxygen.

Front

Where are electrons located in an atom?

Back

Outside the nucleus.

Front

What is the chemical formula for water?

Back

H2O.

Front

What is the role of Carbon in living organisms?

Back

Carbon is a key component of organic molecules, essential for life.

Front

What is the difference between an atom and a compound?

Back

An atom is the smallest unit of an element, while a compound is 2 or more elements chemically bonded together in a set ratio.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is a chemical reaction?

Back

A process where substances (reactants) are transformed into different substances (products).

Front

What is the pH scale used for?

Back

To measure the acidity or basicity of a solution.