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Feb 20, 2024

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1.Determine whether each is a physical or chemical change. a. Sublimation physical change b. Electrolysis (splitting water molecule to hydrogen and oxygen) chemical change 2. Determine whether each is an element, compound, homogeneous, or heteroge- neous mixture. a. Hydrogen Gas - H 2 element b. Carbon dioxide gas CO 2 compound c. Kool-aid homogeneous mixture d. Ice cubes in Glass of sweet tea het- erogeneous mixture 3. For the following calculation, use the equation

q = (mass) (T F - T i ) (Specific Heat) SHOW ALL WORK. Answers must be in correct number of significant figures. a. How many Joules of energy are re- quired to raise 3.50kg of water from 38.5 to 75.0C ? (specific heat of water is 4.184J/g C)(1000g=1kg) (3.5 x 1,000 = 3,500) x (75 - 38.5 = 36.5) x 4.184 = 534,506 6 sig figs b. How many grams of carbon are present if it requires 37.5 kJoules of en- ergy to heat a sample from 30.0 to 55.0C ? (specific hear of carbon is 0.71 J/g C) (37.5 x 1,000 = 37,500) / (0.71 x (55 - 30 = 25) = 17.75) = 2,112.68 6 sig figs

c. If 480.0 Joules is applies to a 50.0g sample of Hg in a thermometer that reads 25.0C, what will be the final temperature of the sample? (SH mer- cury is 0.14) 480 / (50 x 0.14 = 7) = 68.57 + 25 = 93.57 4 sig figs d. A 25.0kg sample of an unknown metal X requires 875kJ of energy to heat it from 55.0 to 125.0C. What is the specific heat of the unknown metal? (875 x 1,000 = 875,000) / (25 x 1,000 = 25,000) / (125 - 55 = 70) = 0.5 1 sig fig

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