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Pure Substance in Chemistry

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Questions and Answers

Which of the following is considered a pure substance?

Gold containing only gold elements (correct)

Water with added minerals

Baking soda with impurities

Table salt mixed with other substances

What is the melting point characteristic of pure substances?

Multiple melting points

Melts at different temperatures

Sharp, single melting point (correct)

No distinct melting point

Which substance is NOT a pure substance?

Diamonds found deep within earth's surface

Copper with high conductivity

Oxygen gas made up of two oxygen atoms

Water found in nature with minerals (correct)

What is the ability of a pure substance to transfer electricity known as?

Conductivity Signup and view all the answers

In chemistry, substances can be described by their physical and chemical properties. Which is NOT a physical property of pure substances?

Ability to react with other substances Signup and view all the answers

What is a pure substance in chemistry?

A substance with a fixed structure and definite properties Signup and view all the answers

What is the concept of purity for a substance to be considered pure?

Purity of 100% Signup and view all the answers

How are impurities removed from liquid substances during refining?

By using distillation or fractionation Signup and view all the answers

What is the reality regarding the purity rating of most pure substances in our lives?

99% Signup and view all the answers

What process helps remove impurities from solid substances during refining?

Putting them in a solution to grow crystals Signup and view all the answers