Class 9 Science CBSE Short questions for Is Matter around us pure

SHORT ANSWER QUESTIONS

1.Define element, compound and mixture.
2.What are pure substance? Give two examples of metals.
3.What are metals? Given two examples of metals.
4.Which method can be used to separate a mixture of naphthalene and common salt?
5.Define homogeneous ad heterogeneous mixtures.
6.Classify the following into elements, compounds and mixtures.
a)Sodium
b)Soil
c)Sugar solution
d)Silver
e)Calcium carbonate
f)Tin
7.Classify each of the following as a homogeneous or heterogeneous mixture.
Soda water, wood, air, soil, vinegar
8.Classify the following elements as metal, nonmetal, or metalloid: aluminum, fluorine, gallium, phosphorus, krypton, tellurium, thorium, barium and strontium.
9.Given the names of the elements present in the following compounds:
a)Quicklime
b)Hydrogen bromide
c)Baking soda
d)Potassium sulphate
10.Can an element be distinguished from its compound by examination of its physical properties only? Explain.
11.Explain why, water is a compound and not a mixture?
12.How do the properties of a mixture differ from the properties of the components of the mixture?
13.In terms of physical properties, what is there about mixtures that makes it possible to separate out the components?
14.How would you separate the following mixture?
i.Salt and water
ii.Glass powder and iron filings
15.Which method is used to separate two immiscible liquids?
Name two elements which are in liquid state at room temperature?

LONG ANSWER QUESTIONS

1.List five characteristics by which compounds can be distinguished from mixtures.
2.What is chromatography? Explain by giving principle involved. State its important applications.
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
4.Suggest a scheme for the separation of constituents of the following mixture:
Sulphur + sand + sugar + iron filings
5.Which method of distillation is employed for the concentration of raw juice in sugar factories Explain in detail.
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
7.Complete the following table based on separation techniques. The first one example is done for you.

 

Class 9 Maths Class 9 Science