The alkanes chemical properties quiz

1. What elements are present in all alkanes?

a) Carbon and oxygen
b) Hydrogen and oxygen
c) Carbon and hydrogen
d) Carbon and sulfur

2. What are the products of the complete combustion of the alkane molecule methane?

a) Water vapour and carbon
c) Carbon monoxide and water vapour
c) Water vapour and sulfur dioxide
d) Carbon dioxide and water vapour

3. Which of the following indicates incomplete combustion?

a) A clean blue flame
b) Carbon dioxide and water being released
c) A yellow luminous flame
d) A flame which releases lots of energy

4. The gas used in Bunsen burners in the lab is gas, this is also the gas which is used in our homes for heating and in the kitchen.

5. Which highly toxic gas is released during incomplete combustion?

a) Carbon monoxide
b) Hydrogen
c) Water vapour
d) Carbon dioxide

6. What causes the yellow colour seen in a Bunsen burner safety flame?

a) Sulfur present as an impurity
b) The presence of soot particles
c) The presence of large water droplets
d) Reflections from the Bunsen metal chimney

7. What test confirms the presence of carbon dioxide gas?

a) Blue cobalt chloride paper turn pink
b) Relights a glowing splint
c) Red litmus paper turns blue
d) Limewater turns milky or chalky

8. What test confirms the presence of water?

a) Blue cobalt chloride paper turns pink
b) Universal indicator solution turns yellow
c) Red litmus paper turns blue
d) White anhydrous copper chloride turns green

9. What is the main reason why incomplete combustion is dangerous?

a) It is noisey
b) It releases less energy
c) It produces too much oxygen gas
d) It releases carbon monoxide gas

10. What is the effect of burning fuels which contain sulfur as an impurity?

a) Acidic gases such as sulfur dioxide are released
b) The fuel burns much faster than expected
c) The fuel burns poorly releasing little energy
d) Excess carbon dioxide gas is released