Chemical Formulas

A model of a chemical compound is shown. What is the correct way to write the formula for this compound?

• 2HO

• 2H2O

• H2O2

• HO2

Tags

NGSS.MS-PS1-1

While elements and compounds are related, they are different. Unlike elements, compounds can be described as which of the following?

• Consist of only one type of atom

• Are the smallest form of a particle

• Exist only as pure substances

• Are made of at least two types of matter

Tags

NGSS.MS-PS1-1

Mrs. Davis has asked Kyle to retrieve a compound from the chemical cabinet. Which of the following should Kyle retrieve?

• Water

• Oxygen

• Chlorine

• Aluminum

The chemical formula for a certain substance is shown here.

Be3Al2SiO36

How many different elements are present in the substance represented by the chemical formula shown?

• 4

• 7

• 15

• 29

Tags

NGSS.MS-PS1-1

In a chemical formula, what is used to indicate the number of atoms of each element?

• Atomic number

• Subscript

• Coefficient

• Atomic mass number

A water molecule is made up of two hydrogen (H) atoms and one oxygen (O) atom. In a chemical equation, what would be the correct way to represent six water molecules?

• 6H2O

• 6HO2

• 2H6O6

• 12H6O

Tags

NGSS.MS-PS1-1