1) Out of shorter and longer hydrocarbons, which are more useful? Explain your answer.
2) Fill in the gaps below with the words “shorter” and “longer”. You will use each word 3 times.
There is a greater demand for _______ hydrocarbons compared to _______ hydrocarbons. Supply is greater than demand for _______ hydrocarbons. Demand is greater than supply for _______ hydrocarbons. Cracking breaks down _______ hydrocarbons into _______ hydrocarbons.
3)
a) Is cracking an exothermic or endothermic reaction?
b) What type of reaction is cracking?
4) Describe the steps in catalytic cracking.
5) The cracking of dodecane (C12H26) produces ethene (C2H4) and one other hydrocarbon. The partially completed chemical equation is shown below.
C12H26 –> _______ + C2H4
a) Find the molecular formula for the other hydrocarbon.
b) Give one use for the ethene that is produced by cracking dodecane.
c) A different molecule of dodecane is cracked. This time it produces propene (C3H6) and one other hydrocarbon. Write the balanced chemical equation for this taking place.
6) The cracking of decane (C10H22) produces heptane (C7H16) and one other hydrocarbon. The partially completed chemical equation is shown below.
C10H22 –> C7H16 + ______
Complete the chemical equation.
7) Is the statement below true or false?
“cracking is used to match supply with demand”
8) The hydrocarbon C12H26 can be cracked. Balance the cracking equation below.
C12H26 –> C8H18 + __ C2H4
9) The hydrocarbon C16H34 can be cracked. Balance the cracking equation below.
C16H34 –> C10H22 + __ C2H4
10) The hydrocarbon C17H36 can be cracked to produce a single octane molecule (C8H18) and many propene molecules (C3H6). Write the balanced cracking equation for this.