Purity, Melting Point and Boiling Point Flashcards

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In chemistry, what is a pure substance?

A pure substance is made of only one element or one compound.

How is a pure substance different from a mixture?

A pure substance has just one substance throughout. A mixture has two or more substances.

What is the melting point of a substance?

It is the temperature where a solid changes into a liquid.

What is the boiling point of a substance?

It is the temperature where a liquid changes into a gas.

What happens to the temperature of a pure substance while it melts?

The temperature stays the same until all the solid has melted.

What happens to the temperature of a pure substance while it boils?

The temperature stays the same until all the liquid has boiled.

How can you use melting point to check if a substance is pure?

Measure its melting point and compare it to the known value for the pure substance.

What melting point pattern shows a substance is pure?

It melts at the correct temperature and over a very small temperature range.

How do impurities affect the melting point of a substance?

Impurities lower the melting point and make it melt over a wider range.

How do impurities affect the boiling point of a substance?

Impurities raise the boiling point and make it boil over a wider range.