Molecules

Front

What is the chemical formula for water?

Back

H₂O

Front

How many atoms are in one molecule of water (H₂O)?

Back

3 (2 Hydrogen atoms and 1 Oxygen atom)

Front

What is the total number of Hydrogen atoms in 2 molecules of water (2H₂O)?

Back

4 Hydrogen atoms

Front

What are the basic building blocks of elements?

Back

Atoms

Front

What is a compound?

Back

A chemical substance made up of 2 or more different types of atoms bonded together.

Front

Is oxygen gas (O₂) a compound? Why or why not?

Back

No, because it consists of only one type of element.

Front

What is the difference between an element and a compound?

Back

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

Front

What is the term for a substance made of only one type of atom?

Back

Element

Front

How many molecules are present in 2H₂O?

Back

2 H₂O molecules

Front

What is the significance of the subscript in a chemical formula?

Back

It indicates the number of atoms of each element in a molecule.