CHEM 302 HW1 - Version 023 Homework 1 Lyon(53565 This...

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Version 023 – Homework 1 – Lyon – (53565) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. This homework assignment is due Wednes- day, January 23, by 4:00PM. 001 10.0 points A property that determines the direction oF heat ±ow is 1. combustion. 2. calorie. 3. entropy. 4. temperature. 002 10.0 points The combustion oF a certain amount oF methane produces 100 kJ oF energy. Dur- ing this process the amount oF energy in the universe 1. increases by 100 kJ. 2. does not increase nor decrease. 3. The answer cannot be determined with- out knowing the chemical equation For this reaction. 4. decreases by 100 kJ. 003 10.0 points ²or which oF the Following processes does the entropy oF the universe decrease? 1. Freezing one mole oF water to ice at - 10 C 2. None oF these is correct. 3. Freezing one mole oF water to ice at 0 C and then cooling it to - 10 C 4. Freezing one mole oF water to ice at 0 C 5. melting one mole oF ice to water at 0 C 004 10.0 points A substance has a molar heat oF Fusion oF 5.90 kJ/mol. Calculate the molar mass oF the substance, given that a 70.8 g sample oF it absorbs 4.83 kJ on melting. Answer in units oF g / mol. 005 10.0 points The melting oF ice is an example oF a physi- cal process that can be non-spontaneous but is increasingly likely to occur as the temper- ature oF the system increases. What charac- teristics oF Δ H and Δ S For the process would correspond to this behavior? 1. Exothermic process with increasing sys- tem disorder 2. Exothermic process with decreasing sys- tem disorder 3. Endothermic process with decreasing sys- tem disorder 4. More than one oF these examples would produce the results described For the melting oF ice. 5.
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CHEM 302 HW1 - Version 023 Homework 1 Lyon(53565 This...

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