Given below are the Class 9 Science CBSE Short questions for Is Matter around us pure
a. Short questions
b. Very Short questions
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SHORT ANSWER QUESTIONS
Question 1. Define element, compound and mixture.
Question 2. What are pure substance? Give two examples of metals.
Question 3. What are metals? Given two examples of metals.
Question 4. Which method can be used to separate a mixture of naphthalene and common salt?
Question 5. Define homogeneous and heterogeneous mixtures.
Question 6. Classify the following into elements, compounds and mixtures.
a.Sodium
b.Soil
c.Sugar solution
d.Silver
e.Calcium carbonate
f.Tin
Question 7. Classify each of the following as a homogeneous or heterogeneous mixture.
Soda water, wood, air, soil, vinegar
Question 8. Classify the following elements as metal, nonmetal, or metalloid: aluminum, fluorine, gallium, phosphorus, krypton, tellurium, thorium, barium and strontium.
Question 9. Given the names of the elements present in the following compounds:
a.Quicklime
b.Hydrogen bromide
c.Baking soda
d.Potassium sulphate
Question 10. Can an element be distinguished from its compound by examination of its physical properties only? Explain.
Question 11. Explain why, water is a compound and not a mixture?
Question 12. How do the properties of a mixture differ from the properties of the components of the mixture?
Question 13. In terms of physical properties, what is there about mixtures that makes it possible to separate out the components?
Question 14. How would you separate the following mixture?
i.Salt and water
ii.Glass powder and iron filings
Question 15. Which method is used to separate two immiscible liquids?
Question 16. Name two elements which are in liquid state at room temperature?
Solution
1.
2.
Pure substances are elements and compounds with no impurities
Examples of Metals are Iron and Mercury
3.
Metals are the elements which have lustre, ductile ,malleable,sonorous and good conductor of heat and electricity
Gold and silver are examples of metals
4.
Sublimation method
5.
homogeneous are uniform composition mixtures while heterogeneous are non uniform composition mixtures
Example for Homogeneous : Salt in water
Example of heterogeneous: oil in water
6.
Elements :Sodium,Silver,Tin
Compounds:Calcium carbonate
Mixtures:Soil,Sugar solution
7.
Homogeneous mixtures: Soda water, air, vinegar
Heterogeneous mixtures: wood and soil.
8.
non-metals : fluorine, phosphorous,krypton.
metals : aluminium,gallium,strontium,barium.
metalloids : tellurium.
9.
a.Quicklime(CaO): Calcium and Oxygen
b.Hydrogen bromide(HBr): Hydrogen and Bromide
c.Baking soda($NaHCO_3$): Oxygen,Sodium,Hydrogen,Carbon
d.Potassium sulphate($K_2SO_4$): Potassium, Sulphur and oxygen
10.
Yes as the physical properties get changed when two elements react to form compounds
11.
Water is a compound as
a. the atoms of hydrogen and oxygen combined with each other to form water
b. its constituents can be separated only by chemical or electrochemical reactions
c. The elements Hydrogen and oxygen are in fixed ratio
13. Physical properties like boiling point ,melting point
14 a. evaporation or distillation
b. iron is magnetic so it can be used by using magnet (magnetic separation)
15.two immiscible liquids are seperated using seperating funnel
16. mercury and bromine.
LONG ANSWER QUESTIONS
Question 1. List five characteristics by which compounds can be distinguished from mixtures.
Question 2. What is chromatography? Explain by giving principle involved. State its important applications.
Question 3. Identify the following as homogeneous or heterogeneous matter.
a.Gasoline
b.Dirt
c.Smog
d.Alcohol
e.Iron nail
f.Vinegar
g.Aerosol spray
h.Air
i.Sea water
j.Steel
Question 4. Suggest a scheme for the separation of constituents of the following mixture:
Sulphur + sand + sugar + iron filings
Question 5. Which method of distillation is employed for the concentration of raw juice in sugar factories Explain in detail.
Question 6. Classify the following as physical change or chemical change.
i.Burning of magnesium ribbon in air
ii.Burning of sulphur in air
iii.Electrolysis of water
iv.Purification of copper sulphate from impure copper sulphat by crystallization
v.Preparation of sugar solution
vi.Conversion of milk into curd
vii.Evaporation of alcohol
viii.Burning of coal
Solution
3.
a.Gasoline : homogeneous
b.Dirt:heterogeneous
c.Smog:heterogeneous
d.Alcohol : homogeneous
e.Iron nail:heterogeneous
f.Vinegar:homogeneous
g.Aerosol spray:heterogeneous
h.Air :homogeneous
i.Sea water:homogeneous
j.Steel:heterogeneoushomogeneous
6.
i.Burning of magnesium ribbon in air: Chemical change
ii.Burning of sulphur in air: Chemical change
iii.Electrolysis of water: Chemical change
iv.Purification of copper sulphate from impure copper sulphate by crystallization: Physical change
v.Preparation of sugar solution: Physical change
vi.Conversion of milk into curd: Chemical change
vii.Evaporation of alcohol:Physical change
viii.Burning of coal: Chemical change
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