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Questions and Answers
How are pure substances defined?
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?
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?
How many elements are currently known?
- 118 (correct)
- 92
- 150
- 63
What is the basis for the classification of elements into metals and nonmetals?
What is the basis for the classification of elements into metals and nonmetals?
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Why are elements grouped together for classification?
Why are elements grouped together for classification?
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Which metal is the most abundant in the earth's crust?
Which metal is the most abundant in the earth's crust?
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In what form are highly reactive metals like sodium and potassium found in nature?
In what form are highly reactive metals like sodium and potassium found in nature?
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Which non-metal is found in its free state in the atmosphere?
Which non-metal is found in its free state in the atmosphere?
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In what state does carbon exist as diamond and graphite?
In what state does carbon exist as diamond and graphite?
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Which metal is an example of a less reactive metal found in nature in its elemental state?
Which metal is an example of a less reactive metal found in nature in its elemental state?
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