Mr. Smith and his friends go on a camping trip. They use propane (C3H8) to fuel their camping stove. Unfortunately it is raining outside and Mr. Smith decides it is best to use the camping stove to roast marshmallows inside the tent. What advice would you give Mr. Smith and why? (3 marks)

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth