The insecticide ddt was introduced in the 1950s, and the rates of malaria dropped significantly. ddt was later found to be toxic to birds and other animals, and it was discontinued in 1964. as a result, rates of malaria began to rise. how can the effects of ddt on society be characterized? only positive, not negative only negative, not positive both positive and negative neither positive nor negative

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