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Pure Substance Quiz

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Questions and Answers

What happens to the solubility of a substance as the temperature increases?

Stays the same

Becomes insoluble

Increases (correct)

Decreases

What is a characteristic of a pure substance?

It has impurities mixed in

It has a definite melting and boiling point (correct)

It varies in composition

It contains particles of other substances

Why does purity matter when making medical drugs or food flavorings?

To ensure safety by preventing harmful substances (correct)

To make the substance taste better

To reduce the cost of production

To increase the amount produced

What happens to the melting point of a solid when it contains impurities?

Falls Signup and view all the answers

Why are gases unusual in terms of solubility compared to other substances?

Their solubility decreases with temperature Signup and view all the answers

What is the process used to separate a mixture of liquids based on their different boiling points?

Distillation Signup and view all the answers

How does distillation work in separating water and alcohol?

Heating the mixture to its boiling point Signup and view all the answers

How are immiscible liquids separated in a laboratory setting?

Using a separating funnel Signup and view all the answers

What is the term used for liquids that do not mix together?

Immiscible Signup and view all the answers

Which technique involves the cooling of a gas back into a liquid for collection?

Crystallization Signup and view all the answers

What is the main characteristic of a mixture?

Easily separable substances Signup and view all the answers

Which of the following is an example of a pure substance?

Table salt (sodium chloride) Signup and view all the answers

What is a solution?

A mixture where one substance dissolves fully into another Signup and view all the answers

In a solution, what is the role of the solute?

Does the dissolving into the solvent Signup and view all the answers

Which of the following best describes the properties of a mixture?

The properties average out the properties of substances mixed Signup and view all the answers