Maharashtra Board Class 7 Science Solution Chapter 14 – Elements, Compounds and Mixtures
Balbharati Maharashtra Board Class 7 Science Solution Chapter 14: Elements, Compounds and Mixtures. Marathi or English Medium Students of Class 7 get here Elements, Compounds and Mixtures full Exercise Solution.
Std |
Maharashtra Class 7 |
Subject |
General Science Solution |
Chapter |
Elements, Compounds and Mixtures |
(1)
Group A | Group B |
(1) Stainless steel | (e) Alloy |
(2) Silver | (f) Metal |
(3) Bhajani mixture for milling | (c) Mixture |
(4) Salt | (b) Compound |
(5) Coal | (a) Non-metal |
(6) Hydrogen | (d) Element |
(2)
Zn = Zinc | Ti = Titanium | Si = Silicon |
CD = Cadmium | Cu = Copper | Ir = Iridium |
XE = Xenon | Fe = Iron | Pt = Platinum |
Br Barium |
(3) Hydraulic acid – HCL
Sulphuric acid = H2SO4
Sodium Chloride = Nacl
Glucose = C6H12O6
Methane = CH4
(4) (a) Churning helps butter to separate the two layer of butter i.e. water and fat. As a result butter is left as liquid.
(c) A wet cloth is wrapped around a water storage contained in summer to keep the water cool in summer.
(5) (a)
Metals | Non-metals |
(i) Metals conduct and electricity | Non-metals do not conduct heat and electricity. |
(ii) Metals react with water | They do not react with water |
(iii) They also react with acids | They do not react with acids |
(b)
Mixture | Compounds |
(i) Composition of the constituents is not same. | (i) Composition of the constituents is same. |
(ii) Mixture is physical condition of substance. | (ii) Compound is chemical combinations of substance. |
(c)
Atoms | Molecules |
(i) Atoms are the smallest part of an element, in chemical reactions | (i) Molecules are the smallest part of an element, exist independently. |
(ii) They never break. | (ii) They break during chemical reactions. |
(6) (a) The components of mixtures are separated by the methods of distillation, separation using funnel, centrifugation, chromatography etc.
(b) Mixtures that we use in our daily life are cement, sugar and milk, lemon and water juice etc. And the compounds that we use in our daily life are – Nacl, sugar etc.
(e) We use centrifugation for drying clothes in washing machine, separating solid from liquid in our day to daily life.
(d) Distillation and separating funnels are used in separation of liquid mixture.
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Nice answer is short but I want Q.6 – (e)