(they don't have science so I guess cemastry will do.) warm air rises because of___

A student holds the back of his hand near an iron tosee if it's hot. The heat transfer is___

Warm water moves throuout a mattress because of___
In a swimmming pool The watter near the surface is warmer because of___
(i'll do the rest later)​

i wish i could but this one is weird give me abc and i can solve it.

bcde is the incorrect answer it is a

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