This data set was created from examining several ice cores drilled at Antarctica's Vostok Station in 2001. Examine the data and write about one correlation that you see. What does the correlation tell you about Earth's historic
atmosphere or climate? (ybp = years before present, ppb = parts per billion, and ppm = parts per million)
Depth (m) Age (ybp) Methane (ppb) Carbon Dioxide (ppm) Temperature Change from Current (°C)
355.765
9169
664.7
263
0.48
362.915
9397
673.7
265.7
0.57
374.57
9761
676.3
267.6
0.64
381.715
9985
678
265.3
0.9
389.97
10248
688
264
1.08
399.215
10548
666
253.9
0.675
407.43
10820
703
245.3
0.28
415.27
11084
664.7
237.5
-0.115
427.27
11513
467.7
238.3
-0.74
434.52
11817
462.3
237.6
-0.805
445.965
12368
627
238.6
-0.51
453.77
12766
661.7
228.5
-0.475
463.565
13249
618.7
225.2
-0.82
469.72
13551
611.7
221
-1.04

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 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 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 molality of calcium chloride (cacl2) in an aqueous solution is 2.46 m. what is mole fraction of the solute?

Which of the following are sources of revenue for media companies? a. direct sales to producers b.advertising and subscriptions c. online purchase d. capital investments