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A pure substance hasn't impurities.

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Q: What is always true for a pure substance?
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Is radioactive waste a pure substance or a mixture?

Radioactive waste is nearly always a mixture but it is possible to be a pure substance.


Is a lemon a pure substance?

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Is Methane a mixture or a pure substance?

Methane is a pure substance.


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Is radioactive waste a pure substance or a mixture?

Radioactive waste is nearly always a mixture but it is possible to be a pure substance.


Is iron a true solution?

No. Iron is a pure substance.


Is tin a pure substance or a mixture?

Pure Tin is a metallic element with the symbol Sn.Tin is always pure. Tin is not a mixture, but it may be a part of a mixture, like in bronze


Is a pure substance a substance with nothing else?

Yes, it is true; but the absolute purity doesn't exist.


Does the composition stays the same or pure substance?

A pure substance consists of only one type of element or compound. The composition of a pure substance always stays the same, with a fixed ratio of its constituent particles.


Is a compound always a pure substance?

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A classification for matter that always has the same composition?

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What substance can neutralise the water?

Pure water is always neutral.


Is it true that thermal energy always flows from a cooler substance to a warmer substance?

No. The opposite would be true.


What has a fixed composition and is always homogeneous?

A compound has a fixed composition and is always a homogeneous pure substance.


Is acetone a pure substance or mixture?

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Is milk a pure substance scientifically?

Milk is considered a mixture rather than a pure substance because it is composed of different compounds such as water, proteins, fats, and sugars.