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Class 7 > Chemistry Flashcards > Flashcards

Chemistry Flashcards

1
Q

What is matter is broadly classified into

A

Pure and impure substances

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2
Q

What are pure substances classified into

A

Elements and compounds

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3
Q

What are impure substances classified into

A

Mixtures

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4
Q

More abundant elements in the universe
Less abundant elements in the universe

A

Hydrogen and Helium
Oxygen, Neon, nitrogen and carbon

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5
Q

More abundant elements in the earth’s crust
Less abundant elements in the earth’s crust

A

Oxygen and Silicon
Aluminium, Iron, Calcium, Sodium, Potassium, Magnesium

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6
Q

More abundant elements in the earth’s crust
Less abundant elements in the earth’s crust

A

Oxygen and Silicon
Aluminium, Iron, Calcium, Sodium, Potassium, Magnesium

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7
Q

More abundant elements in the atmosphere
Less abundant elements in the atmosphere

A

Nitrogen Oxygen argon carbon dioxide helium neon argon carbon monoxide sulphur dioxide

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8
Q

Main element in the human body
Other elements in the human body

A

Oxygen
Carbon hydrogen nitrogen calcium

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9
Q

The most reactive metal
The least reactive metal

A

Potassium
Gold

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Class 7 (3 decks)

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