Counting Atoms and Chemical Equations

Number of H in 3(NH₄)₂CrO₄

• 4

• 2

• 8

• 24

Tags

NGSS.MS-PS1-1

How many atoms are there TOTAL in:
H₂SO₄

• 6

• 5

• 7

• 3

Tags

NGSS.MS-PS1-1

Number of N in (NH₄)₂CrO₄

• 1

• 2

• 8

• 16

Tags

NGSS.MS-PS1-1

A subscript is the small number below a(n) ________ that tells the number of _______ of that element.

• element symbol; atoms

• atom; element symbol

• subscript; protons

• compound; elements

Tags

NGSS.MS-PS1-1

How many atoms of carbon (C) are in  C₆H₁₂O₆?

• 3

• 6

• 12

• 24

Tags

NGSS.MS-PS1-1

Why must chemical equations be balanced?

• So that the equation doesn't explode

• The reaction won't happen until it is balanced

• Based on the Law of Conservation of Matter, matter cannot be created or destroyed.

• Based on the Law of Conservation of Energy, energy cannot be created or destroyed.e

Tags

NGSS.MS-PS1-5

How many atoms of hydrogen (H), sulfur (S), and oxygen (O) are there in sulfuric acid (H₂SO₄)?

• H-6, S-4, O-4

• H-1, S-2, O-8

• H-2, S-1, O-4

• H-2, S-4, O-4

Tags

NGSS.MS-PS1-1

Chemical reactions occur when _________ are broken and new bonds are formed.

• mixtures

• osteoclasts

• physical bonds

• chemical bonds

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Balance this equation...
HgO --> Hg + O₂

• It is balanced 

• 2HgO --> Hg + O₂

• 2HgO --> 2Hg + O₂

Tags

NGSS.MS-PS1-5

Balance this equation...
H₂ + Cl₂ --> HCl

• It is balanced 

• 3H₂ + Cl_{2 -->} 6H₂Cl

• H₂ + Cl_{2 -->} 2HCl

Tags

NGSS.MS-PS1-5