Worksheet: Chemical Formulas

In this worksheet, we will practice writing and interpreting the notations used in chemical formulas.

Q1:

What is the formula for carbon monoxide?

  • ACO2
  • BCO2
  • CCO
  • DCO+
  • ECO3

Q2:

What is the formula of aluminum oxide?

  • AAlO23
  • BAl(OH)23
  • CAlO2
  • DAl(OH)3
  • EAlO

Q3:

What is the formula for aluminum sulfate?

  • AAl(SO)43
  • BAl(SO)243
  • CAlSO4
  • DAlSO3
  • EAl(SO)233

Q4:

What is the formula for iron(III) chloride?

  • AFeCl
  • BFeCl2
  • CFeCl3
  • DFeCl3
  • EFeCl23

Q5:

What is the formula of strontium carbonate?

  • ASrCO23
  • BSrHCO3
  • CSr(HCO)32
  • DSrCO3
  • ESr(CO)32

Q6:

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

  • AMg2+
  • BMg(2+)
  • CMg+
  • DMg
  • EMg+2

Q7:

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

  • ACl
  • BCl
  • CCl
  • DCl
  • ECl

Q8:

How many atoms of oxygen are present in the formula 10SO2?

Q9:

What is the chemical formula of dichlorine heptoxide?

  • A2ClO7
  • BClO27
  • C2ClO7
  • DClO
  • EClO26

Q10:

What is the chemical formula of strontium oxide?

  • ASrO
  • BStO
  • CSrO2
  • DStO2
  • EOSr

Q11:

Which elements are present in a molecule of CO2?

  • ACopper and osmium
  • BCadmium and oxygen
  • CCarbon and oxygen
  • DCobalt
  • ECobalt and osmium

Q12:

How many hydrogen atoms are present in a formula unit of aluminum hydroxide hexahydrate (Al(OH)·6HO)32?

Q13:

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

  • ACHO241
  • BCHO24
  • CCHO24
  • D2C4H1O
  • ECHO

Q14:

Which of the following is equivalent to the chemical formula “3CO2”?

  • A3 free carbon atoms and 6 free oxygen atoms
  • B1 molecule of triple carbon dioxide
  • C3 molecules of carbon dioxide
  • D3 dioxycarbon molecules
  • E3 carbon monoxide molecules

Q15:

How many hydrogen atoms are there in a molecule of methane (CH)4?

Q16:

What is the correct way to write “2 water molecules” using chemical formulas?

  • AHO22×
  • BHO22
  • C2HO2
  • D(HO)22
  • E2HO×2

Q17:

What would the name of a compound containing one atom of chlorine and two atoms of oxygen be?

  • ADichlorine oxide
  • BOxygen chloride
  • CChlorine dioxide
  • DDichlorine dioxide
  • EChlorine monoxide

Q18:

NO2 is commonly known as laughing gas. What is its chemical name?

  • ADinitrogen dioxide
  • BNitrogen monoxide
  • CDinitrogen monoxide
  • DOxygen nitride
  • ENitrogen dioxide

Q19:

In which of the following chemical formulas is the order of elements incorrect?

  • ABF3
  • BCO2
  • CSH2
  • DNaF
  • EGaAs

Q20:

What would the name of a compound of calcium and fluorine be?

  • AFluorine calcide
  • BCalcium fluoride
  • CCalcide fluorine
  • DFluoride calcium
  • ECalcide fluoride

Q21:

Which of the following compounds is not diatomic?

  • ACl2
  • BH2
  • CCO
  • DHCl
  • EO3

Q22:

Which of the following ionic compounds has an incorrect formula?

  • ANaF2
  • BAlCl3
  • CCa(NO)32
  • DKOH
  • EMgO

Q23:

Iron(II) sulfate is composed of Fe2+ and SO24 ions. In order to form a neutral salt, what must the ratio between the two ions be?

  • AFe2+ : SO24 = 1 : 2
  • BFe2+ : SO24 = 4 : 1
  • CFe2+ : SO24 = 1 : 1
  • DFe2+ : SO24 = 1 : 4
  • EFe2+ : SO24 = 2 : 1

Q24:

Iron(III) ions have a charge of 3+ and oxide ions have a charge of 2. What is the formula of iron(III) oxide?

  • AFeO
  • BFeO46
  • CFeO32
  • DFeO3
  • EFeO23

Q25:

Sodium ions have a charge of 1+ and chloride ions have a charge of 1. What is the formula of the compound formed from sodium ions and chloride ions?

  • ANaCl
  • BNaCl2
  • CNaCl34
  • DNaCl2
  • ENaCl22

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