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1) `My wife and I always argue about the temperature in our house. I like it at 294.0 K, while she likes to set the thermostat to 300.0 degrees K. As...

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1) `My wife and I always argue about the temperature in our house. I like it at 294.0 K, while she likes to set the thermostat to 300.0 degrees K. As we take turns constantly changing the seTng, our poor hea±ng and cooling system tries to keep up. I argue that it causes us to waste money. My living room contains 50 kg of air. In the summer ±me, I pay about $0.14 per kWh of energy used. How much does it cost me every ±me we heat the air in the living room from 294.00 K to 300 K? (HIN²: How many kWh does it take?) ²he heat capacity of our air is 1.01 J/(gC). All work must be shown, labeled, and explained in detail to receive credit. Note that where applicable, superscripts (X2) can be wri³en as X^2 and subscripts (X2) can be wri³en as X_2 if it saves you ±me. 2) My cat weighs 37.0 lbs. Yes, she is a li³le large. I put her into a bathtub containing 47.0 gallons of water when Flled to the very top. A´er I put her in, I collected all the water that ran over the side of the tub, and found it to be equal to 0.923 gallons. (A) What is the density of my cat in grams per cubic cen±meter? (B) What if next ±me I do this she gains 4.0 lbs. and grows big enough to displace 1.10 gallons. Will she s±ll have the same density? Explain and prove your answer. All work must be shown, labeled, and explained in detail to receive credit. Note that where applicable, superscripts (X2) can be wri³en as X^2 and subscripts (X2) can be wri³en as X_2 if it saves you ±me. 3) Chemistry really is another language some±mes. It abbreviates a lot, and chemical formulas are a way to write a li³le and s±ll convey a lot of informa±on. µor example, consider the formulas H2SO4, AgI , Al(NO3)3 , and S6µ10 (the numbers you see here are supposed to be subscripts). ²ranslate these formulas into actual word names using the appropriate procedure described in the course text and my lecture material. Answer the following: (1) What are the formal names of each of these compounds? (2) Explain how exactly (i.e. the procedure used) you arrived at your answer. ..in other words, walk me through your thinking. You will not receive credit if you don't show your work in detail. 4) Give the A) Element Symbol, B) Atomic Number, C) Number of Protons, D) Number of Neutrons, (E) Mass Number, and (µ) total Number of Electrons for: Cesium–135 and Selenium-81 Cesium – 135 Selenium – 81 5) ²here are several indicators for a chemical reac±on. List a minimum of 5 things you could look for to know that a chemical reac±on has taken place. You must show all work clearly and in detail to receive credit. 6) ²rinitrotoluene (C7H5N3O6), also known as ²N², is a common and useful explosive because it is not a¶ected that much by fric±on or shock (thus is less likely to accidentally detonate). When it is detonated, it forms the following products according to this equa±on: 2 C7H5N3O6 → 3 N2 + 5 H2O + 7 CO + 7 C. ²here are several types of "blends" that are used, which essen±ally are ²N² mixed with other ingredients. However, it is certainly possible to use actual blocks of pure ²N². Suppose I give you a 250 g block of pure ²N² and you detonate it. How much carbon residue (solid carbon--the C in the products
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side of the equaTon), in grams, would be produced? You must show all work clearly and in detail to receive credit. All numbers immediately following elemental symbols should be understood as subscripts.
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