There are four substances, A, B C and D. A and C are pure substances. They cannot be broken down into anything simpler by chemical methods. B consists of A and D, which are not chemically bonded together. D is a pure substance. We can decompose D into A and C using chemical methods. How would we classify substance A, C, and D?

A: Substances A and C are elements, because they are pure substances that bond together to make substance D and cannot be broken using chemical processes . Substance D is a mixture, because it is a pure substance made up of A and C.

B: Substances A and C are compounds, because they are pure substances that bond together to make substance D and cannot be broken using chemical processes . Substance D is a mixture, because it is a pure substance made up of A and C.

C: Substances A and C are elements, because they are pure substances that bond together to make substance D and cannot be broken using chemical processes. Substance D is a compound, because it is a pure substance made up of A and C.

D: Substances A, C, and D, are elements. All pure substances are elements.

From the description in the question and the images shown, we can see that the substances, A and C are combined to form D. Furthermore, we are told that A and C are pure substances. Recall that pure substances are composed of only one type of atom(s).

Since they can not be broken down by chemical means, it follows that A and C must be elements. D can be broken up into A and C by chemical methods because D is a compound.

Summarily, substances A and C are elements, because they are pure substances that bond together to make substance D and cannot be broken using chemical processes. Substance D is a compound, because it is a pure substance made up of A and C.

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