When phillip analyzed an unknown substance x, he found that it contained only one kind of atom. phillip was unable to convert the substance to a simpler one. what is substance x? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

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Substance X is a (B) Element.

Explanation: -

A compound consists of either many identical atoms or more than 1 type of atom. They can be broken down or converted into a simpler one.

An element is a substance which contains only one kind of atom. It cannot be broken down further or converted into simpler substance by any chemical means.

Heterogeneous mixture is a non uniform mixture of different atoms without any chemical bonding in between them.

Homogeneous mixture is a uniform mixture of different atoms without any chemical bonding in between them.

From the definitions it is clear that substance X is (B) Element.

i believe the answer is a.

c. 75.7

i think that is the right