Counting Atoms and Chemical Formulas

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe₂O₃--> __Fe + __CO₂

• 3,1 --> 2,3

• 3,2 --> 1,1

• 3,2 --> 2,4

• 3,2 --> 2,1

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NGSS.MS-PS1-5

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

How many Magnesium atoms are in 10MgCl₂?

• 10

• 5

• 20

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NGSS.MS-PS1-1

How many atoms are there TOTAL in H₂SO₄ ?

• 6

• 5

• 7

• 3

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NGSS.MS-PS1-1

How many Oxygen atoms are in Al₂(SO₄)₃?

• 4

• 12

• 7

• 24

Tags

NGSS.MS-PS1-1

How many Hydrogen atoms in 3(NH₄)₂CrO₄?

• 4

• 2

• 8

• 24

Tags

NGSS.MS-PS1-1

C₃H₅(NO₃)₃

• C = 3, H = 5, N = 3, O = 9

• C = 3, H = 5, N = 1, O = 9

• C = 9, H = 15, N = 3, O = 9

• C = 9, H = 15, N = 1, O = 3

Tags

NGSS.MS-PS1-1

How many atoms are present if there is no subscript following the element symbol? (if there is no coefficient)

• 0

• 2

• only 1

• 1 million

Tags

NGSS.MS-PS1-1

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

How many Hydrogen atoms are in 4H₂O?

• 6

• 8

• 2

• 4

Tags

NGSS.MS-PS1-1