HW4Caraiza - HOMEWORK QUESTIONS Chapter 4 Energy chemistry...

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HOMEWORK QUESTIONS Chapter 4: Energy, chemistry, and society 1. List three fossil fuels. Coal, oil, and natural gas. b. What is the origin of fossil fuels? Fossil fuels originated hundreds of millions of years ago from ancient plant and animal matter. Over hundreds of millions of years, these materials were transformed into coal, petroleum, and natural gas by the action of heat and pressure. c. Are fossil fuels a renewable resource? No they are not, because the length of time required to form these fuels means they are not renewable. 2. Consider the data for these three hydrocarbons. Compound, For- mula Melting Point ( ° C) Boiling Point ( ° C) pentane, C 5 H 12 -130 36 triacontane, C 30 H 62 66 450 octane, C 8 H 18 -57 125 1. Predict the physical state (solid, liquid, or gas) of each at room temperature. If room temperature is 20-25 °C, pentane should be a liquid because room temperature is below it’s boil- ing point but above it’s melting point. Triacontane should be solid at room temperature because room temperature is below it’s melting point. Octane should be a liquid at room temperature for the same rea- son as pentane. 3. From personal experience, state whether these processes are endothermic or exothermic. Give a rea- son for each.
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