Year 11 Chemistry Question Paper

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Chemistry Final Exam Version 12/2016
Name:
Student number:
Directions: It is important that you provide answers in your own words. Please focus only on information from the text/eBook to create your own solutions. Please do not use direct information from an outside source (especially copying and pasting from an “answer” website). Use of direct information from an outside source is against school policy. All answers will be checked for plagiarism. Instances of plagiarism can result in probation or possible dismissal from the school.
Please be sure to follow all guidelines (number of sentences/showing all calculations) and to provide the correct metric units of measure. All questions are 3.33 points each (.33 for unit)

1. A …show more content…
If 5.40 kcal of heat is added to 1.00 kg of water at 100⁰C, how much steam at 100⁰C is produced? Show all calculations leading to an answer. Heat of vaporization of water = 540 cal/g m=1000 g energy supplied = 5.4 kcal=5400 cal T1=T2=100 deg. C so all energy is used to convert to steam mass of steam produced = 5400 cal /(540 cal/g) =5400/540 cal *g/cal =10 g

10. The freezing of water at 0⁰C 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.
The volume of ice is higher than the volume of water. Applying pressure will cause the reaction to shift to the side that has the lower volume. That is the water side so the ice melts.
11. The Kw of water varies with temperature. Calculate the pH of water at 46⁰C with a Kw = 1.219 x 10-14. Show all calculations leading to an answer. [H+] [OH-] = Kw .
In pure water [H+] = [OH-] , therefore
[H+] = √Kw
[H+] = √( 3.219*10^-14)
[H+] = 1.79*10^-7 pH = -log …show more content…
(13 and that is Al) w = 24 + 4 = ? 13Al28 ==> 11Na24 + 2He4

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.

When you push the button, the pressure pushes the paint up the tube and out through the nozzle. The nozzle separates the paint into tiny droplets, which leave the can as a spray. As the paint is used it makes more room for the gas. When the gas expands, its pressure decreases. So less paint means more gas and more gas means less pressure.

22. pH is a measure of ______a_______.
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.
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