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11 Chemistry Questions

Date Posted: 25/04/2019
Category: Chemistry
Due Date: 27/04/2019
Instruction
1.You are given a clear solution of KNO3. Using 3 – 4 sentences (in your own words) explain how you would determine if the solution is unsaturated, saturated or supersaturated. 2. Explain why gasoline will not dissolve in water. 3. Explain in 3 – 4 sentences (in your own words) how perspiration helps keep you cool on a hot day. 4.You have two sealed jars of water at the same temperature. In the first jar there is a large amount of water. In the second jar there is a small amount of water. Using 3 -4 sentences explain how the vapor pressure of water in the first jar compares with the vapor pressure of water in the second jar. 5.Using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 6.Using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. Use 3 – 4 sentences in your explanation. 7. Why must the number of electrons lost equal the number of electrons gained in every redox reaction? Use 3 – 4 sentences in your own words to address this question. 8. What type of radiation is emitted when chromium-51 decays into manganese-51? Show the nuclear equation that leads you to this answer. 9.A radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. What was the identity of the original nucleus? Show the nuclear equation that leads you to this answer. 10.Iron-59 has a half-life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new sample of iron? Show all calculations leading to a solution. 11. Using at least 3 to 4 complete content related sentences, explain how the compressed gas in an aerosol can forces paint out of the can. Be sure to describe how the gas pressure inside the can changes as the paint is sprayed.
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