Question

Why is the data for water different from the elements, hydrogen and oxygen?
A) Properties of compounds differ from the properties of their respective elements.
B) Chemical properties of elements are always the same as the compounds they make up.
C) Physical properties of elements are the same as the compounds they make up, generally.
D) The physical properties of compounds are the same as the physical properties of the elements that make it up but the chemical properties are different.

Answer 1

The answer is A. Many compounds are comprised of very different elements. For example, Sodium is a highly reactive group 1 solid metal that combusts when in contact with water, and Chlorine is a reactive group 17 gas that is used in the treatment of pool water; however, when you put them together, you get quite a common, non-toxic food additive: salt. Elements and compounds can sometimes resemble each other, but it certainly isn’t uncommon to see large differences between the two.

Answer 2

think of this, is a child physically or chemically identical to either of his or her parents. So yes it is A.