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15. Its December and you want to heat up your pool. It is currently 50 o F (10 o C) and you want it raised to 80 o F (27 o C) Using an electric heater,

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Presentation on theme: "15. Its December and you want to heat up your pool. It is currently 50 o F (10 o C) and you want it raised to 80 o F (27 o C) Using an electric heater,"— Presentation transcript:

1 15. Its December and you want to heat up your pool. It is currently 50 o F (10 o C) and you want it raised to 80 o F (27 o C) Using an electric heater, how much will it cost if 1 kilowatt-hour is 11 cents? The pool is 7.0 meters long, 5.0 meters wide and 2.0 meters deep. A. Whats the volume in cubic meters? ______ B. What is the volume in cubic centimeters?___________ C. What is the total grams of the water? ____________ A calorie is defined as the energy needed to raise one gram of water one degree Celsius. D. How many calories will it take to raise the pool water from 10 o C to 27 o C? _______________ E. 1 calorie = x kilowatts hours. How many kilowatt-hours will you need? ____________ F. How much will it cost to heat the pool from 50 o F (10 o C) to 80 o F (27 o C)? _______________ 14. Metric facts: 1 meter was originally defined as the distance from equator to north pole divided by? 10 million One tenth of a meter is called a decimeter How many centimeters (cm) in one meter? 100 How many millimeters (mm) in one meter? 1000 The volume of 1,000 cubic centimeters (cm 3 or cc) is called a liter. How many milliliters (mL) are in a liter? 1000 A milliliter (mL) is what fraction of a liter? 1 thousandth A milliliter is how many cubic centimeters? 1 A cubic centimeter of water has the mass of how many grams? 1 A liter of water has the mass of how many grams? For temperatures we see in Phoenix, a quick way to do an approximate conversion in your head for Fahrenheit to Celsius is to subtract 30, add 5, and then cut in half. For Celsius to Fahrenheit, double then add 25. Use this method for the following conversions. Exact is to subtract 32 and multiply by o C to o F: 99 o F 25 o C to o F: 75 o F 10 o C to o F: 45 o F 80 o C to o F: 185 o F 52 o F to o C: 13 or 14 o C 101 o F to o C: 38 o C 70 o F to o C: 22 or 23 o C 125 o F to o C: 50 o C 7.0m x 5.0m x 2.0m= 70. m 3 70 m 3 x 100cm/mx100cm/mx100cm/m= 70,000,000 cm 3 since 1cm 3 water=1 g 70,000,000 grams 70,000,000 grams 17 o C 1 calorie = 1,190,000,000 calories or 1.19x10 9 calories g. o C 1.19x10 9 calories 1.163x10 -6 kilowatt-hrs = 1.38x10 3 kilowatt-hours calories 1.384x10 3 kilowatt-hours $0.11 = $ kilowatt-hr

2 19. Balance the following chemical equations & write what type of reaction it is. 20. Original meanings A. Atom is derived from atomos, what does that mean? indivisible B. Electron comes from the Greek word for amber. Why? Amber demonstrates the existence of electrons. When you rub amber with fur, amber pulls electrons off the fur giving both a static electrical charge. C. Where does the word, Molecule come from? Mole means a mass. cule means small just like it does in the word, minuscule. So the word molecule means a small mass. In chemistry it more specifically means 2 or more atoms bonded together. For example, an atom of oxygen becomes a molecule of oxygen when two oxygen atoms bond together. A molecule of two or even a million atoms bonded together is still a very small mass. F 2 Fluorine Cl 2 Chlorine F 2 O Difluorine monoxide SO Sulfur monoxide H 2 S Dihydrogen monosulfide N 2 S 5 Dinitrogen pentasulfide NO Nitrogen monoxide NO 3 Nitrogen trioxide N 2 O Dinitrogen monoxide Cl 2 O Dichlorine monoxide NH 3 Ammonia mono- 1 di- 2 tri- 3 tetra- 4 penta- 5 hexa- 6 deca Be prepared to give the written name if the formula is given and vice versa. 18. Know what these prefixes mean Zn + FeCl 2 Fe + ZnCl 2 KClO 3 KCl + O 2 AlCl 3 + Ca CaCl 2 + Al NaCl + MgSO 4 Na 2 SO 4 + MgCl 2 CH 3 CH 2 OH + O 2 CO 2 + H2OH2O CaO + H 2 O Ca(OH) 2 Single replacement Decomposition Double replacement Combustion Synthesis (combination)


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