Need chemistry help to distinguish between pure and impure substances

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timer Asked: Dec 25th, 2015
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Question Description

distinguish between pure and impure substances;

Tutor Answer

TwinkleR
School: Carnegie Mellon University

Thank you for the opportunity to help you with your question! I am keeping it as detailed as possible, i expect you to come back again for more lessons :D

Pure and impure chemical substances. A pure element or compound contains only one substance, with no other substances mixed in.Impure materials may be mixtures of elements, mixtures of compounds, or mixtures of elements and compounds.

Pure substances

Elements and compounds are pure substances.

1. A pure substance has uniform composition and properties in all its parts, as it consists of particles of only one kind. For example, sugar and salt are pure substances.

2. It has certain characteristics such as specific temperatures at which it melts and boils. For example, pure water boils at 100°C.

3. The constituents, which make up a pure substance cannot be separated by physical means.

Impure substances

Mixtures are impure substances.

1. A substance is said to be impure if it has particles of other substances mixed in it.

2. The constituents of impure substances may be present in any ratio.

3. The constituents of an impure substance retain their individual properties. For example, the properties of iron and sand do not change when they are mixed together.

4. The constituents of an impure substance can be separated by physical means.


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Anonymous
Tutor went the extra mile to help me with this essay. Citations were a bit shaky but I appreciated how well he handled APA styles and how ok he was to change them even though I didnt specify. Got a B+ which is believable and acceptable.

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