1. In allergy sufferers, histamine causes runny noses, red eyes, and other symptoms. Here is its structural formula. a. Give the chemical formula for this compound. Ans: C5H9N3 b. Circle the amine functional groups in histamine. Ans: c. Which part (or parts) of the molecule make the compound water-soluble? Ans: 2. Antihistamines are widely used drugs for treating symptoms of allergies caused by reactions to histamine compounds. This class of drug competes with histamine, occupying receptor sites on cells […]
1. When Styrofoam packing peanuts are immersed in acetone (the primary component in some nail-polish removers) they dissolve. If the acetone is allowed to evaporate, a solid remains. The solid still consists of Styrofoam, but now it is solid and much denser. Explain. (Hint: Remember that Styrofoam is made with foaming agents.) Answer: Acetone dissolves the polymer which enables the gas of the foaming agent to escape. Since the gas has been removed, the polymer collapses on itself and become more dense. […]
1. Mammoth Cove National Park in Kentucky is in close proximity to the coal-fired electric utility plants in the Ohio Valley. Noting this, the National Parks Conservation Association(NPCA) reported that this national park had the poorest visibility of any in the country a. What is the connection between coal-fired plants and poor visibility? Coal-fired plants release sulfur dioxide, creating sulfate particles that are responsible for 60-85% of the poor visibility in the eastern parks. b. The NPCA reported ‘the average […]
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 […]
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 […]
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. […]
In today lesson, 25th January 2017, I have learnt that: Particles of ashes hasten the transformation of sulfur dioxide to sulfur trioxide Water vapor changes from time to time and day to day Nitrogen is the most abundant of exhale air That’s all folk
I’ve learnt that NO2 speed up the formation of sulfuric acid from sulfur dioxide instead of the particles of ashes.
i believe that the humans walking inhale more pollutants than passengers.
Today I learned that dihydrogen monoxide contribute to soil erosion.