Physical and Chemical Changes During Digestion (7.6): Question 2
The diagram illustrates the pathway and time frame for the digestion of a hamburger. During which time period is matter undergoing only a physical change?
Select one:

9:50 a. m. - 1:00 p. m.

6:03 p. m. - 6:06 p. m.

6:03 p. m. - 10:15 p. m.

10:15 p. m. - 9:50 a. m.

what are the statements

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)

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