Label the parts of the atom.

b

c

d

e

a

2nd Energy Level

Proton

Electron

Neutron

1st Energy Level

Reorder the following metric prefixes from largest to smallest

• mega(M)

• milli(m)

• kilo(k)

• centi(c)

• deci(d)

H₂SO₄ + HI → H₂S + I₂ + H₂O

The blue numbers in the image below represent ________

• Charges
• coefficients
• subscripts
• none of the answers are correct

Fill in the blanks with coefficient:

PCl₅+_ H₂O→_ HCl+H₃PO₄

• 4, 5

• 1, 6

• 3, 8

• 2,2

Is this equation balanced?

• yes
• no
• Not enough information
• Left side is balanced

The red numbers in the image below represent ________

• subscripts
• coefficients
• I don't know, and don't want to try
• None of the answers are correct

CHECK ALL THAT APPLY.

Which of the following are correctly written elements?

• C

• H₂

• O₂

• F

• Na₂

From the following ionic compounds, choose the name-formula pair that is not correctly matched.

• sodium sulfide Na₂S

• ammonium nitrate

  (NH₄)(NO₃)

• sodium sulfate

  Na₂(SO₃)

• calcium oxide CaO

The chemical formula for an ionic compound of potassium and oxygen is

• KO.
• K₂O.
• K₂O₂.
• KO₂.