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.
Answers
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