Min tapes a piece of string to each of two ping-pong balls. he hangs the balls so that they are close to one another but do not touch. later, he finds that they have pulled together. they are now touching. what could explain why two balls are now touching?

a) they have both lost their charges

b) they have gained opposite charges

c) they have both gained a positive charge

d) they have both gained a negative charge

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