1. Used as a solvent 2. The major constituent of natural gas.

3. Vinegar when in a diluted form.

4. Used in the manufacture of polyethylene plastic

Match the compounds below to their correct uses from above:

37.C2H4

38. CH4

39. CH3OH

40. CH3COOH

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.

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

If 22.5 of nitrogen at 748 mm hg are compressed to 725 mm hg at constant temperature. what is the new volume?