Question

DOASDIRECTED
1)Differentiate between:

a)elements and compounds b)atoms and molecules

2)From the list given below ,identify the metals and non-metals and write them under
Their respective headings:

Iron, oxygen, bromine, mercury, zinc, nitrogen, calcium, sulphur, gold, carbon.

3)Separate the following substances given below into elements ,compounds and
Mixtures

Seawater, Oxygen, Sugar, Sodium , chloride, Copper, Air, Water, Ice cream, Silver.

4)What are mixtures?

5)What is the difference between N and N2?

6)Name the elements present in the following compounds

a)Magnesium Chloride (b)Calcium Oxide (c)Zinc Sulphide

7)Why are atoms known as the building blocks of matter?

8)With the help of an example explain how properties of a compound is different from
The properties of its constituents.

Answer 1

Answer:

elements are made of only one type of atom

compounds are a mixture of different elements combined in fixed ratio

atoms smallest unit of a particular substance which can not be destroyed anymore

when two or more atoms combine because they cannot survive independently they are called molecules

iron ,Mercury, zinc ,gold are metals

oxygen ,bromine ,nitrogen, calcium ,Sulphur and carbon are non metals

sea water and ice cream are mixtures also air

oxygen sodium chloride are elements also silver

sugar and water are compounds

Explanation:

when elements are compounds are combined in in unproportionate ratios they are called mixtures and they have same characteristics of their parent element or compound

N single atom of nitrogen atom N2 is a molecule

magnesium and chlorine

calcium and oxygen

zinc and sulphur

atom known as building blocks of matter has everything and anything is comprised of atoms