Elements : Combine to form compounds :: Compounds : ______.

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Elements: Combine to form compounds:: Compounds: can be split into elements

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अध्याय 3: Matter Around Us - Evaluation [पृष्ठ ३९]

अध्याय 3 Matter Around Us
Evaluation | Q III. 3. | पृष्ठ ३९

Define: Elements

Give reason: Graphite is used to make a lead of the pencils.

Indicate whether the following statement is true or false:
Metals can be polished.

Differentiate between the terms –
elements, compounds & mixtures.

Match the statements in List I – 1 to 10 correct answers in List II-A to J.

	List I		LIst II
1	Fluorine and chlorine	A	Nitrogen
2	A diatomic molecule	B	Boron
3	A molecule containing the elements hydrogen and oxygen.	C	Reactants
4	A metalloid - showing properties of both metals and non-metals.	D	Chemical Formula
5	The term used for the substances which take part in the chemical reaction	E	Halogens
6	The term represents a substance by means of symbols.	F	Water
7	The term used for the substances formed as a result of a chemical reaction	G	Nitric Acid
8	A compound containing one atom of zinc and two atoms of chlorine.	H	Products
9	The chemical name for nitrogen monoxide.	I	Phosphorus
10	A polyatomic molecule.	J	Zinc Chloride

Select the correct answer from the choice given below.
The negatively charged particles in an atom

With reference to elements – define the term ‘molecule’. Give two examples each of a monoatomic, diatomic & polyatomic molecule.

What are elements? What are they made of?

______ is the life-giving element is the air.

Complete the table by writing the symbols of the following elements