Counting Atoms and Molecules

The number written to the lower right of an element that tells you the number of atoms.

• Law of conservation of mass

• chemical equation

• subscript

• coefficient

How many Chlorine are in MgCl₂?

• 2

• 1

• 3

Tags

NGSS.MS-PS1-1

The _______ describes the atoms in a compound.

• chemical equation

• chemical formula

• chemical symbol

• coefficient

Tags

NGSS.MS-PS1-1

Which of the following would be an example of a chemical formula:

• C₆H₁₂O₆

• F= ma

• 2 H₂ + O₂ --> 2 H₂O

• 6.02 x 10 ²³

Tags

NGSS.MS-PS1-1

What is this?

• Atom

• Molecule

• Compound

Tags

NGSS.MS-PS1-1

How many atoms in total are there in nitric acid? HNO₃

• 3

• 6

• 5

Tags

NGSS.MS-PS1-1

• 18

• 12

• 25

• 24

Tags

NGSS.MS-PS1-1

What does the subscript in a chemical formula tell you? (a)  

• How many molecules are present

• How many atoms are present

• How many elements are present

• How many neutrons are present

How many elements are in this chemical formula?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

• 6

• 1

• 12

Tags

NGSS.MS-PS1-1