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Pure Substances Quiz

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Questions and Answers

How are pure substances defined?

Materials with varying kinds of particles

Materials made up of the same kind of particles (correct)

Materials with unique properties

Materials with no chemical properties

Why are different elements/compounds classified together?

Due to their physical state

Due to their different properties

Due to their similar properties (correct)

Due to their atomic weight

How many elements are currently known?

118 (correct)

150

What is the basis for the classification of elements into metals and nonmetals?

Differences in physical and chemical properties (B) Signup and view all the answers

Why are elements grouped together for classification?

To study their general characteristics (D) Signup and view all the answers

Which metal is the most abundant in the earth's crust?

Aluminium (C) Signup and view all the answers

In what form are highly reactive metals like sodium and potassium found in nature?

Elemental form (A) Signup and view all the answers

Which non-metal is found in its free state in the atmosphere?

Oxygen (A) Signup and view all the answers

In what state does carbon exist as diamond and graphite?

Elemental state (C) Signup and view all the answers

Which metal is an example of a less reactive metal found in nature in its elemental state?

Gold (A) Signup and view all the answers