Water, h2o, is made up of different elements, hydrogen and oxygen. is this type of combination a mixture or a pure substance? a) because water is composed of two separate elements, it is a mixture. b) because water can be heated and fairly easily turned to steam, it is a mixture. c) because water is composed of elements found in the periodic table, it is a pure substance. d) because water molecules all have a consistent ratio of hydrogen to oxygen, it is a pure substance. e

the correct answer is D i just got it on USATestPrep. Your welcome.

A pure substance is a substance with a consistent ration of the elements that make it up. This means that there is no way to tell one water molecule apart from the other. The atoms in a pure compound contain atoms bonded in the same way throughout the compound.

On the other hand, a mixture  has constituents that have different pure substances mixed together. The constituents of a mixture are easy to distinguish from each other.

With these definitions in mind, we can easily see that water is a pure sustenance because water molecules all have a consistent ratio of hydrogen to oxygen atoms.

The correct answer for this question is D)Because water molecules all have a consistent ratio of hydrogen to oxygen, it is a pure substance.

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