Question

A compound is a pure substance that is composed of more than one type of element. Which of the following statements is true of compounds?

Compounds can be decomposed into their component parts through physical processes.

There is only one type of compound, so they all have similar characteristics and compositions.

Compounds have definite chemical compositions that can be described by chemical formulas.

Compounds have properties which are identical to the properties of their component elements.

Answer 1

What's an example of compound?

Answer 2

Water is an example of a compound. Water is two hydrogen atoms and one oxygen molecule: \( H_2O \).

Table salt is another, \(NaCl \) a sodium and chlorine atom.

Hence the second statement, "There is only one type of compound, so they all have similar characteristics and compositions" is false

Answer 3

What about the fourth statement,
"Compounds have properties which are identical to the properties of their component elements" ?

Answer 4

it's 'Compounds have definite chemical compositions that can be described by chemical formulas.' right?

Answer 5

I think more than one answer is correct.

Answer 6

no, only one...

Answer 7

"Which of the following statementS is true of compounds?"

I guess it depends what we mean by physical processes.

Answer 8

there are the physical processes (filteration, distillation, crystallisation etc )and the chemical processes like electrolysis

Answer 9

yes. If a physical process also includes super-hot heating, that also works.

Answer 10

I don't think we can crack a compound using physical processes. Well, except in the case of dissociation, which is probably the only exception.

Answer 11

I'll defer to you guys who are closer to High School science, to which (I hope) this question belongs.

Answer 12

But dissociation is more of an equilibrium thing. Once we cool it back down, the compound will un-dissociate.

Answer 13

'un-dissociate'. Nice.

Answer 14

I'm fond of highly technical words.

Answer 15

;-)