If the solid form of most molecules is heavier than the liquid form, why does ice float? A)A water molecule becomes smaller when frozen.
B)The arrangement of frozen water molecules prevents them from interacting with water molecules in liquid form.
C)Water molecules are arranged closer together when frozen than in liquid form.
D)Water molecules are arranged farther apart when frozen than in liquid form.

C)Water molecules are arranged closer together when frozen than in a liquid form.

Explanation:

Ice is less dense than water. More molecules are brought closer together and need to be accommodated in a smaller area

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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