Q1) How can you purify your water when you are hiking? Name two or three possibilities. Compare these methods in terms of cost and effectiveness. Are any of these methods similar to those used to purify municipal water supplies? Explain. Ans:There are a few methods to purify water while hiking. The first method is to boil the water. Boiling can kill many microorganism that might cause one to sick. However, it requires time and does not remove chemical contamination. Boiling […]
Month: February 2017
Q1) Understanding Earth’s energy balance is essential to understanding the issue of global warming. For example, the solar energy striking Earth’s surface averages 168 watts per square meter (W/m^2), but the energy leaving Earth’s surface averages 390 W/m^2. Why isn’t Earth cooling rapidly? Ans: Even though the amount of energy leaving Earth’s surface is more than twice the amount received, Earth does not cool rapidly because the atmosphere retains much of the emitted heat energy. Q2) Decide and explain whether the statement is correct […]
Categorized in My Work
From personal experience, state whether these processes are endothermic or exothermic. Give a reason for each. A charcoal briquette burns. Water evaporates from your skin. Ice melts. Answer: Exothermic. A charcoal briquette releases heat as it burns. Endothermic. Evaporation requires thermal energy from the surrounding. In this sense, thermal energy from your body helps the water on the skin to evaporate. When water evaporates, it takes away thermal energy from the surface of your skin, and your skin feels cooler. […]