Molecules and compounds

Front

What is a subscript in a chemical formula?

Back

A subscript is a number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

Front

What are molecules?

Back

Molecules are made up of two or more atoms bonded together.

Front

How many atoms of oxygen are in carbon dioxide (CO₂)?

Back

There are 2 atoms of oxygen in carbon dioxide.

Front

How many hydrogen atoms are in 2H₂O?

Back

There are 4 hydrogen atoms in 2H₂O.

Front

What happens to elements when they form compounds?

Back

When elements form compounds, they lose their individual chemical properties and take on new properties.

Front

What is a coefficient in a chemical formula?

Back

A coefficient is a number placed in front of a chemical formula that indicates how many molecules are present.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H₂O.

Front

What does the chemical formula NaCl represent?

Back

NaCl represents sodium chloride, which is a compound made of sodium and chlorine.

Front

What is the significance of the number in H₂O?

Back

The number 2 in H₂O indicates that there are 2 hydrogen atoms in each molecule of water.