What is a compound? what are compounds composed of? what is true about the composition of a compound, no matter where we happen to find the compound?

a. A chemical compound is a substance of definite composition having different chemical and physical properties from the atoms of two or more different elements from which it is formed.

b. A compound is composed of atoms from two or more different elements chemically bonded together in fixed small whole number ratios to each other

c. The composition of a compound is fixed in all physical states

Explanation:

Example of compounds include

1. Water H2O

2. Common salt NaCl

3. Glucose C6H12O6

Compounds are pure substance that combines two or more atoms of elements.

Compounds are composed of atoms of two or more elements that are chemically bonded.

One fact about the composition of compound is that they have a definite proportion by mass , so they are the same through out and are definitely homogeneous

Explanation:

Compounds are pure substance that combines two or more atoms of elements. The atoms are usually chemically bonded. These pure substances can only be separated to their distinct elements by chemical means.

Generally, when two distinct elements are chemically forming a bond between atoms a chemical compound is usually formed. Example of chemical compound is NaCl(Sodium chloride) . The compound is formed from the composition of two different element namely sodium and chlorine. The atoms of this two distinct elements are bonded ionically to form a chemical compound known as sodium chloride. The pure substance formed can only be separated by a chemical means.

Compounds have different properties from their elemental constituents and are rarely separated by physical means.

One fact about the composition of compound is that they have a definite proportion by mass , so they are the same through out and are definitely homogeneous

the answer to your question is c

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