please\" have mercey on me i pleed of thee\" I need your smart help\"\"\" Please
ID: 532485 • Letter: P
Question
please" have mercey on me i pleed of thee" I need your smart help"""
Please help" And can you write it right inside of the homework. Thanks that would be alot easyer for me to just copy in paste and put it in my homework. And i know you said twenty quastions. But can you Answer the five last quastions for me too, Because I only have one more day to complete this assingment so that means this might be the end of me useing chegg. Because this is my last home work assingment. Thanks ALOT YOU GUYS!!!:):):)
1. A student collected the following data for a fixed volume of gas:
Temperature (C)
Pressure (mm of Hg)
10
726
20
750
40
800
70
880
100
960
150
???
Fill in the missing data point. Show all calculations leading to an answer.
2. 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.
3. Explain why gasoline will not dissolve in water.
4. Explain in 3 – 4 sentences (in your own words) how perspiration helps keep you cool on a hot day.
5. 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.
6. Using 3 – 4 sentences explain (in your own words) why water expands when it freezes?
7. 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.
8. When a 2.5 mol of sugar (C12H22O11) are added to a certain amount of water the boiling point is raised by 1 Celsius degree. If 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? Show all calculations leading to your answer OR use 3 – 4 sentences to explain your answer.
9. If 5.40 kcal of heat is added to 1.00 kg of water at 100C, how much steam at 100C is produced? Show all calculations leading to an answer.
10. The freezing of water at 0C can be represented as follows:
H2O (l) H2O(s)
The density of liquid water is 1.00 g/cm3. The density of ice is 0.92 g/cm3. In 3 – 4 sentences explain why applying pressure causes ice to melt.
11. The Kw of water varies with temperature. Calculate the pH of water at 46C with a Kw = 1.219 x 10-14. Show all calculations leading to an answer.
12. Calculate the hydroxide ion concentration of a solution with pH = 3.25. Show all calculations leading to an answer.
13. What salt results from the neutralization of phosphoric acid with potassium hydroxide?
14. What is the oxidation number of chlorine in Al(ClO4)3?
15. Which element is oxidized in the following reaction:
CuO(s) + H2 (g) à Cu(s) + H2O (l)
16. 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.
17. The following unbalanced equation describes the reaction that can occur when lead (II) sulfide reacts with oxygen gas to produce lead (II) oxide and sulfur dioxide gas:
PbS + O2 à PbO + SO2
Balance the equation and describe in words the electron transfer(s) that takes place.
18. What type of radiation is emitted when chromium-51 decays into manganese-51? Show the nuclear equation that leads you to this answer.
19. 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.
20. 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.
21. 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. Please refer to figure 14.5 in lesson 14.1.
22. pH is a measure of ______________.
a. hydrogen ion concentration. c. hydroxide ion concentration.
b. hydrogen gas concentration. d. hydrolysis.
23. A neutralization reaction between an acid and a base always produces
a. salt and acidic anhydride. c. water and basic anhydride.
b. salt and basic anhydride. d. salt and water.
24. If the pH of a solution is _____ the solution is basic.
a. 2 b. 5 c. 7 d. 10
25 – 30 Apply the appropriate word to the definition indicated. Not all words will be used.
25. _____
Heat content of a system at constant pressure
calorie (cal)
26. _____
Ability to do work
Chemical Potential Energy
27. _____
Disorder
Energy
28. _____
Energy of motion
Enthalpy
29. _____
Study of energy changes that ocrrue during chemic reaction and changes in states.
Entropy
30. _____
Amount of heat required to raise T of 1 g of pure water 1C
Joule
Kinetic energy
Heat (q)
Specific Heat
Thermochemistry
Temperature (C)
Pressure (mm of Hg)
10
726
20
750
40
800
70
880
100
960
150
???
Explanation / Answer
1) Plot a graph of pressure vs temperature as shown below:
Use the regression equation to find out the pressure of the gas when the temperature is 150C. Put x = 150C and obtain
y = 2.608*(150) + 698.01 = 1089.21
The pressure of the gas at 150C is 1089.21 mm of Hg (ans).
2) A saturated solution is defined as one which contains the maximum amount of a solute at a particular temperature, without precipitating out any solid. An unsaturated solution contains less than the maximum amount of the solute while a supersaturated solution contains more than the maximum amount of the solute and hence contains undissolved solute. The supplied solution of KNO3 is clear; hence the solution cannot be supersaturated. The solution is therefore saturated or unsaturated. The easiest way to test is to add more solid KNO3 to the solution. If a precipitation occurs with the addition of a slight amount of KNO3, the solution supplied is saturated. However, if no precipitation occurs, then the solution is unsaturated and can take in more solid KNO3.
3) An important rule of thumb is like dissolves like. Gasoline is a non-polar organic liquid while water is a polar inorganic solvent. Gasoline contains hydrocarbon chains which are non-polar and hydrophobic (repels water). However, these hydrocarbon chain can exhibit dispersion forces and hence dissolve in organic solvents like hexane or ether. Water, on the other hand, is a polar solvent and can exhibit hydrogen bonding and dipole-dipole interactions and hence, gasoline doesn’t dissolve in water.
4) On a hot day, we tend to perspire, especially in humid environments. The sweat which comes out of the body is really water mixed with salt and toxins. The water evaporates due to the high temperature outside and the evaporation process takes with it, some amount of heat. In other words, our body releases heat to the surroundings. Therefore, the body loses heat and the temperature drops.
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