Chemical Reactions and Equations

Topics in this chapter

• Chemical Reactions and Equations
• Writing and Balancing Equations
• Types of Chemical Reactions
• Oxidation and Reduction
• Corrosion and Its Prevention
• Rancidity and Food Preservation

Cheat sheet

Practice questions

1. Question 1Q-E42135

   A student strongly heats lead nitrate in a test tube. Which gases are produced?

   1. A.Nitric oxide and oxygen
   2. B.Nitrogen dioxide and oxygen
   3. C.Nitrous oxide and oxygen
   4. D.Sulphur dioxide and oxygen
   See the answer and solution
2. Question 2Q-AA5872

   What colour appears when copper sulphate crystals dissolve in water?

   1. A.Green
   2. B.Red
   3. C.Blue
   4. D.Brown
   See the answer and solution
3. Question 3Q-A3B341

   How does a freshly cleaned piece of zinc normally appear?

   1. A.Bluish-white with a silvery-grey shine
   2. B.Bright green
   3. C.Golden yellow
   4. D.Reddish-brown
   See the answer and solution
4. Question 4Q-CC18E5

   Which test identifies the gas released when zinc reacts with dilute hydrochloric acid?

   1. A.Test it with red litmus paper
   2. B.Bring a burning splint near it
   3. C.Bubble it through limewater
   4. D.Test it with blue litmus paper
   See the answer and solution
5. Question 5Q-74696F

   Why should copper sulphate solution not be kept in an iron vessel?

   1. A.It freezes immediately inside iron
   2. B.Iron displaces copper and the vessel corrodes
   3. C.Copper sulphate evaporates through iron
   4. D.Iron is less reactive than copper
   See the answer and solution