3Arctic ice plays an important role in cooling the earth. What evidence from the text best supports this statement? In the last 30 years, more than one-third of the ice that appears in the Arctic during the summer has melted away. Arctic ice reflects the sun's light. When Arctic ice melts, it reveals more of the darker-colored land or ocean water. Darker-colored land absorbs the sun's light, causing the climate's temperature to increase.

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o