Counting Atoms Practice

How many elements are in C₂H₈O ?

• 2
• 1
• 3
• 0

Tags

NGSS.MS-PS1-1

How many Chlorine (Cl) are in MgCl₂?

• 2
• 1
• 3

Tags

NGSS.MS-PS1-1

How many Hydrogen atoms are in 4H₂O? ​ (a)   How many oxygen atoms? ​ (b)   How many molecules? ​ (c)  

• 8

• 4

• 1

• 2

• 3

• 5

• 6

• 7

• 9

• 10

Tags

NGSS.MS-PS1-1

How many elements are in 2C₆H₁₂O₇? (a)   How many C: ​ (b)   How many H: ​ (c)   How many O: ​ (d)   How many TOTAL atoms: ​ (e)  

• 3
• 12
• 24
• 14
• 50
• 7
• 6
• 2
• 52
• 60

Tags

NGSS.MS-PS1-1

2C₆H₉AlO₅

Number of C: ​ ​ (a)   Number of H: ​ ​ (b)   Number of Al: ​ (c)   Number of O: ​ ​ (d)  

• 2
• 3

• 1

• 6

• 7

• 9

• 10
• 12
• 18
• 4

Tags

NGSS.MS-PS1-1

How many Nitrogen atoms are in the in H₃C₂ON₅?

• 2

• 3

• 4

• 5

Tags

NGSS.MS-PS1-1

Match the element to the number of atoms it has: 2Al₂C₄H₆O₈

• 12

• carbon (C)

• 16

• aluminum (Al)

• 4

• oxygen (O)

• 8

• hydrogen (H)

Tags

NGSS.MS-PS1-1

What does the subscript in a chemical formula tell you?

• How many molecules are present

• How many atoms are present

• How many elements are present

• How many neutrons are present

What does the coefficient in a chemical formula tell you?

• How many molecules are present

• How many atoms are present

• How many elements are present

• How many neutrons are present

Tags

NGSS.MS-PS1-5

Match the formula to the description:

• 1 sulfur, 4 oxygen

• SO₄

• 3 sulfur, 12 oxygen

• SO₃

• 4 sulfur, 6 oxygen

• 2S₂O₃

• 1 sulfur, 3 oxygen

• 3SO₄

Tags

NGSS.MS-PS1-1