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hmwk 4 solutions

# hmwk 4 solutions - mao(tm23477 Homework 4 Gases liquids...

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mao (tm23477) – Homework 4: Gases, liquids, solids – Shear – (52375) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. You may need to look up conversion factors and values of R in the back of your textbook. 001 10.0 points Write the net ionic equation for this reaction occurring in water: Sodium phosphate and calcium chloride are mixed to form sodium chloride and calcium phosphate. 1. 2 PO 3 4 + 3 CaCl 2 6 Cl + Ca 3 (PO 4 ) 2 2. No reaction occurs. 3. 2 PO 3 4 + 3 Ca 2+ Ca 3 (PO 4 ) 2 correct 4. PO 2 4 + Ca 2+ CaPO 4 5. 2 Na 3 PO 4 + 3 Ca 2+ 6 Na + + Ca 3 (PO 4 ) 2 Explanation: 002 10.0 points Consider two cylinders of gas, both with a volume of 25 L and at 1 atm and 25 C and the following statements. A. The average kinetic energy of the gases is the same. B. The average molecular speed of the gases is the same. C. The temperature of the gases is different. Which statements are true? 1. C only 2. A and B only 3. A and C only 4. B only 5. B and C only 6. None is true. 7. All are true. 8. A only correct Explanation: From kinetic molecular theory, the mean kinetic energy of the molecules in a sample of gas is directly proportional to the temper- ature of that gas. This means that any two samples of gas at the same temperature have the same mean kinetic energy. The mean kinetic energy of the gas is KE mean = 1 2 (MW)(average molecular speed) 2 which means that if two samples of gas have the same mean kinetic energy they only have the same average speed if they have the same MW. 003 10.0 points Real gases behave most nearly like ideal gases at 1. high temperatures and low pressures. correct 2. low temperatures and high pressures. 3. high temperatures and high pressures.

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