Solve the questions
Answers
Answer:
Ans-5)
(i) Chloride and Sodium
(ii) Sulfuric acid , Hydrochloric acid and nitric acid
(iii) Mg+O2=2MgO
Ans-6)
(i) An element is the pure substance of one type of atom for example iron, copper, gold ,nitrogen, Oxygen.
and compounds are substance made from atom of different elements joined by chemical bond for example water and methane ,sodium chloride.
(ii)
a. Sodium hydroxide is used in the manufacture of soap.
b. calcium hydroxide is used in manufacture of bleaching powder.
c. calcium hydroxide is also used to clean the Sulphur dioxide which is caused by exhaust that is found in the power plants and factories.
Ans-8)
Compounds:-
(i) compounds have fixed composition.
(ii) these are pure substances.
(iii) they can only be separated by using chemical method.
Mixture:-
(i) they always show varying composition.
(ii) they are impure substance.
(iii) they can easily be separated by using physical methods.
(ii) the three main types of tissues are:-
dermal , vascular and ground tissue.
dermal tissue covers and protect the plant and vascular tissue transports water and minerals and sugar to different part of the plant.