Ye Olde Chapter 2

Chapter 2
Preamble: So this chapter is REALLY boring. Actually not only is it REALLY boring, but it is UNBELIEVABLY boring. But it is really important cuz if you don't understand this stuff a lot of the really cool stuff in chemistry is impossible to understand. Because its so deadly dull, I've decided to spice it up with...SPACE PIRATES! So, argg mateys, prop yer eyes open with toothpicks and we'll begin...

1. Read ye chapter 2.

2. (61) Finish the following chapter questions:
3, 9, 11, 13, 23, 25, 27, 29, 35, 37, 39, 47, 49, 53, 65.
4, 4, 4, 6, 4, 6, 4, 6, 6, 6, 4, 2, 1, 1, 3.

3. (2) As the great space pirate, Ricarrrdo El Barbe, you know that your weight in pounds on the moon is about one sixth of that while on earth. However, your number of kilograms stays the same. Why is this?

4. (3) Are mass and volume always interchangeable? If so, how? If not, how can you convert one into the other?

5. (3) Let's say you travelled 5,555 km in 7 hours on your space bike and you wanted to know your speed. You pull out your Interstella Calculator and divide 5555 km by 7 hr to get km/hr. You get 793.57142857143 km/hr. Why is this not the correct answer? What would the correct answer be?

6. (3) In calculating the trajectory of your spacecraft, why are significant figures be important? What about scientific notation?

7. (1) What is "10" in scientific notation?

8. (5) In a shocking turn of events, your first mate Alberrrto El Segundo died precisely 80 years after he was born. How many seconds did he live? Write the calculations including the conversion factors.

9.(2) You find that for every cubic centimeter of granite you leave on your counter, 0.39 alien rock eaters will find their way into your kitchen. Determine how many cubic centimeters of granite your girlfriend left on the counter if you find 9 rock eaters in your kitchen. Include the conversion factors in the answer.

10. (3) On your shoulder sits a dead 0.5 kg rat. It used to be a parrot, but you shaved it. The rat died after eating two grams of salt. Assuming salt has the same toxicity in humans, how much salt would you have to consume to get a lethal dose? Include conversion factors in your answer. Hint: measure your weight in pounds on the scale and convert to kilograms.

11. (2) The thermometer outside your ship is reading -274˚C. Convert this temperature into Kelvin. What is significant about this temperature?


Notes: the second paragraph of 2.3 actually obsesses scientists a lot of the time. It's a small paragraph but it's actually extremely important!
Also, I used to think that scientific notation was a bunch of nightsoil but then I noticed how I kept getting answers wrong because it's really easy to drop zeros. I know its a pain in the butt to write out so I've found an easy way around this - change the "times ten to the power of" to "E". So 4 x 10^-6 becomes 4E-6. This is a lot easier, as long as you remember what the E means.
Conversion factors are essential and dimensional analysis will save you loads of brain computing power and time memorizing stupid equations. I LOVE conversion factors and dimensional analysis because they are so useful, if you can figure out how to use them. This book offers a fairly good look at them, so try to understand if you can.

TOTAL
61 marks for chapter questions
24 marks for assignment questions
85 marks in total

Bonus: (1) In your own words, describe 2 properties of helium as it approaches absolute zero from this video: