Counting Atoms

The "2" in H₂O is known as a ______

• superscript

• subscript

• coefficient

How many Nitrogen atoms are in one formula unit of Ca(NO₃)₂

​ (a)  

• 2
• 1
• 3
• 4
• 5
• 6
• 7

Tags

NGSS.MS-PS1-1

How many TOTAL atoms are present in one formula unit of Al(NO₃)₃ ?

Tags

NGSS.MS-PS1-1

Match the following to the number of atoms it contains.

• Al

• 2 atoms

• S

• 3 atoms

• O

• 12 atoms

Tags

NGSS.MS-PS1-1

A compound secreted by honeybees to paralyze intruders in their hive is known as 2-heptanone. The formula for this compound is shown. It has ​ (a)   carbon atoms, ​ (b)   hydrogen atoms, and ​ (c)   oxygen atom.

• 7
• 14
• 1
• 4
• 3

Tags

NGSS.MS-PS1-1

How much oxygen?

Mathematical Equivalence

ON

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

NGSS.MS-PS1-5

How many atoms of oxygen are represented in the picture?

• 2

• 3

• 5

• 6

Tags

NGSS.MS-PS1-1

How many carbon atoms are there?

• 2

• 3

• 8

• 16

• 10

Tags

NGSS.MS-PS1-1