Counting Atoms and Chemical and Physical Changes

How many different elements are present in H₂COCH₂

• 5

• 4

• 3

• 2

Tags

NGSS.MS-PS1-1

The ______ are numbers found on the lower right-hand side of an element symbol.

• Coefficient

• Exponent

• Multiplier

• Subscript

H₂SO₄

• H = 2, S = 4, O = 4

• H = 2, S = 1, O = 4

• H = 8, S = 4, O = 4

• H = 2, SO = 4

Tags

NGSS.MS-PS1-1

How many different elements are present in this molecule?

3 NH₄C₂H₃O₂

• 15

• 36

• 5

• 4

Tags

NGSS.MS-PS1-1

The law of conservation of matter states that

• chemical reactions change matter.
• in chemical reactions, the identity of reactants and products is conserved.
• atoms are neither created nor destroyed in chemical reactions.
• a chemical equation must be balanced.

Tags

NGSS.MS-PS1-5

How many atoms of Calcium are in this equation?

H₃O₅CaCl₇

• 3

• 5

• 1

• 7

Tags

NGSS.MS-PS1-1

How many atoms of Carbon are in this equation?

HʒC₅O₄

• 3

• 1

• 5

• 4

Tags

NGSS.MS-PS1-1

How many total atoms in the following equation?

ClN₆Fe₂

• 6

• 8

• 10

• 9

Tags

NGSS.MS-PS1-1

How many total atoms in the following equation?

3He₂Ag5

• 2

• 21

• 24

• 5

Tags

NGSS.MS-PS1-1

How many atoms of Iron in the following equation?

C₂HAu₅

• 2

• 0

• 9

• 7

Tags

NGSS.MS-PS1-1