Which of the following statements is an example of a valid hypothesis? a. Brass is not an element found on the periodic table of elements.
b. Baking soda is the common name for sodium bicarbonate.
c. Ionic compounds will have a higher melting point than a molecular compound.
d. The latin word the element iron is Ferrum. Ferric and Ferrous are two of the common ions formed by iron.

answer seismograph;

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