Complete the following table the first one is done. Formula of compounds Elements present in the compound CO 2 Carbon and Oxygen CaO PbO PbS CuS FeS

Formula of compounds Elements present in the compound CO 2 Carbon and Oxygen CaO Calcium and Oxygen PbO Lead and Oxygen PbS Lead and Sulphur CuS Copper and Sulphur FeS Iron and Sulphur A chemical formula represents one molecule of an element or a compound.

Complete the following table: Compound Formula Number of elements Names of elements Copper sulphate CuSO 4 3 Copper, sulphur, oxygen Zinc sulphide ZnS Ammonia NH 3 Sulphuric acid H 2 SO 4 Hydrochloric acid HCl Table salt NaCl

Compound Formula Number of elements Names of elements Copper sulphate CuSO 4 3 Copper, sulphur, oxygen Zinc sulphide ZnS 2 Zinc, sulphur Ammonia NH 3 2 Nitrogen, hydrogen Sulphuric acid H 2 SO 4 3 Hydrogen, sulphur, oxygen Hydrochloric acid HCl 2 Hydrogen, chlorine Table salt NaCl 2 Sodium, chlorine A chemical formula represents one molecule of an element or a compound.

Complete the following table: Substance Element, compound or mixture Why do you think so? Gold Element It is made of one kind of atom Diamond Carbon dioxide Air Sea water Pure water Iron Ammonia Soda water Table salt ( NaCl )

Substance Element, compound or mixture Why do you think so? Gold Element It is made of one kind of atom Diamond Element It is made of one kind of atom Carbon dioxide Compound It is made of two different elements carbon and oxygen combined in a fixed ratio Air Mixture Air is a homogeneous mixture of different gases. Sea water Mixture Sea water contains salt, minerals and many other particles. Pure water Compound It is made of two different elements hydrogen and oxygen combined in a fixed ratio Iron Element It is made of one kind of atom Ammonia Compound It is made of two different elements hydrogen and nitrogen combined in a fixed ratio Soda water Mixture It is a gas in liquid mixture Table salt ( NaCl ) Compound It is made of two different elements sodium and chlorine combined in a fixed ratio

E M B I B E

Innovative Chemistry>Chapter 2 - Elements, Compounds and Mixtures>EVALUATE YOUR UNDERSTANDING>Q II

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6th ICSE

IMPORTANT

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Mercury is a non-metal.

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Important Questions on Elements, Compounds and Mixtures

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IMPORTANT

Innovative Chemistry>Chapter 2 - Elements, Compounds and Mixtures>EVALUATE YOUR UNDERSTANDING>Q II

Water is a compound made up of hydrogen and oxygen gas.

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6th ICSE

IMPORTANT

Innovative Chemistry>Chapter 2 - Elements, Compounds and Mixtures>EVALUATE YOUR UNDERSTANDING>Q II

Constituents of a mixture are present in a fixed proportion.

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IMPORTANT

Innovative Chemistry>Chapter 2 - Elements, Compounds and Mixtures>EVALUATE YOUR UNDERSTANDING>Q II

In a homogeneous mixture, constituents are uniformly mixed throughout the mixture.

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IMPORTANT

Innovative Chemistry>Chapter 2 - Elements, Compounds and Mixtures>EVALUATE YOUR UNDERSTANDING>Q II

Air is a heterogeneous mixture.

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6th ICSE

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Innovative Chemistry>Chapter 2 - Elements, Compounds and Mixtures>EVALUATE YOUR UNDERSTANDING>Q V

Complete the following table the first one is done.

Formula of compounds	Elements present in the compound
${CO}_{2}$	Carbon and Oxygen
$CaO$
$PbO$
$PbS$
$CuS$
$FeS$

EASY

6th ICSE

IMPORTANT

Innovative Chemistry>Chapter 2 - Elements, Compounds and Mixtures>EVALUATE YOUR UNDERSTANDING>Q V

Complete the following table:

Compound	Formula	Number of elements	Names of elements
Copper sulphate	${CuSO}_{4}$	$3$	Copper, sulphur, oxygen
Zinc sulphide	$ZnS$
Ammonia	${NH}_{3}$
Sulphuric acid	$H_{2} {SO}_{4}$
Hydrochloric acid	$HCl$
Table salt	$NaCl$

MEDIUM

6th ICSE

IMPORTANT

Innovative Chemistry>Chapter 2 - Elements, Compounds and Mixtures>EVALUATE YOUR UNDERSTANDING>Q V

Complete the following table:

Substance	Element, compound or mixture	Why do you think so?
Gold	Element	It is made of one kind of atom
Diamond
Carbon dioxide
Air
Sea water
Pure water
Iron
Ammonia
Soda water
Table salt ( $NaCl$ )