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Lesson: Chemical Formulas

In this lesson, we will learn how to write and interpret the notations used in molecular and structural formulas.

Worksheet • 14 Questions

Q1:

What is the formula of strontium carbonate?

  • A S r C O 3
  • B S r C O 2 3
  • C S r ( C O ) 3 2
  • D S r H C O 3
  • E S r ( H C O ) 3 2

Q2:

A magnesium atom has the chemical formula M g . What is the chemical formula of the magnesium ion?

  • A M g 2 +
  • B M g –
  • C M g ( 2 + )
  • D M g +
  • E M g + 2

Q3:

A chlorine atom has the chemical formula C l . What is the chemical formula of the chloride ion?

  • A C l –
  • B C l
  • C – C l
  • D C l –
  • E – C l

Q4:

How many atoms of oxygen are present in the formula 1 0 S O 2 ?

Q5:

What is the formula for carbon monoxide?

  • A C O
  • B C O +
  • C C O 2
  • D C O 3
  • E C O 2

Q6:

Which elements are present in a molecule of C O 2 ?

  • ACarbon and oxygen
  • BCobalt and osmium
  • CCobalt
  • DCadmium and oxygen
  • ECopper and osmium

Q7:

What is the formula of aluminium oxide?

  • A A l O 2 3
  • B A l ( O H ) 3
  • C A l O
  • D A l O 2
  • E A l ( O H ) 2 3

Q8:

How many hydrogen atoms are present in a formula unit of aluminum hydroxide hexahydrate ( A l ( O H ) · 6 H O ) 3 2 ?

Q9:

What is the chemical formula for a molecule composed of 2 atoms of carbon, 4 atoms of hydrogen, and 1 atom of oxygen?

  • A C H O 2 4
  • B C H O 2 4 1
  • C C H O
  • D 2 C 4 H 1 O
  • E C H O 2 4

Q10:

The structural formula of ethanol is:

H C H C H H H O H

Which of the following is a structural isomer of ethanol?

  • A
    C H H H O C H H H
  • B
    C H C O H
  • C
    H C C H O H H
  • D
    C C H H H H O
  • E
    C H O C H H H

Q11:

What is the formula of iron(III) chloride?

  • A F e C l 3
  • B F e C l 2 3
  • C F e C l 3
  • D F e C l 2
  • E F e C l

Q12:

What is the formula of aluminium sulphate?

  • A A l ( S O ) 2 4 3
  • B A l ( S O ) 4 3
  • C A l ( S O ) 2 3 3
  • D A l S O 3
  • E A l S O 4

Q13:

What is the chemical formula of dichlorine heptoxide?

  • A C l O 2 7
  • B 2 C l O 7
  • C C l O
  • D C l O 2 6
  • E 2 C l O 7

Q14:

What is the chemical formula of strontium oxide?

  • A S r O
  • B O S r
  • C S r O 2
  • D S t O 2
  • E S t O
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