IZ 5. Gasohol is a mixture of ethanol and petroleum-based products that can be used as an alternative fuel for cars. Which statements are considered as disadvantages for increased u of gasohol? I. Ethanol can be produced from renewable resources, such as corn and sugarcane. II. Use of corn for fuel may limit the availability of com for food. III. Complete combustion of gasohol produces greenhouse gases. IV. Undergoes better combustion and improves octane rating. A. I and II only B. II and III only C. I and IV only D. III and IV only 6. An advantage of using natural gas as a fuel is I A. It is more abundant than coal and crude oil. B. It is easy to locate and extract. C. It is the cleanest of the fossil fuels. D. Exists as a gas. 7. Which of the following is not true about radioactive elements? A. Used in determining age of fossils/artifacts. B. Used to generate electricity. C. Eliminated from medicine because they are very harmful. D. Normally the identity of the element changes during their decay 8. Which of the following will cause the rate of a nuclear reaction to speed up? A. Raising the temperature B. Increasing the concentration of reactants. C. Adding a catalyst D. All of these will speed up the rate of a reaction. E. None of these will speed up the rate of reaction