ICSE Living Science Chemistry for Class 6 Solutions Chapter 1 Chemistry an Introduction

A. Tick the most appropriate answer.

Question 1.
Chemistry is a branch of science which deals with the study of –
a. plants
b. animals
c. characteristics and composition of substances
d. the earth
Answer:
c. characteristics and composition of substances

Question 2.
Medicines like penicillin and tetracycline are used to –
a. treat infection
b. relieve pain
c. control fever
d. all of these
Answer:
a. treat infection

Question 3.
An example of petrochemicals is –
a. steel
b. fertilizer
c. kerosene
d. brick
Answer:
c. kerosene

Question 4.
Silicon and germanium And use in
a. electronics
b. fertilizers
c. pesticides
d. cement
Answer:
a. electronics

Question 5.
Which of the following is an explosive ?
a. carbon
b. coal
c. trinitrotoluene
d. mortar
Answer:
c. trinitrotoluene

B. Mention the use of the following apparatus
1. Test tube
2. Beaker
3. Measuring cylinder
4. Conical flask
Answer:
1. Test tube – Test tube is used for carrying out chemical tests and for heating solids or liquids.
2. Beaker – Beaker is used for stirring, mixing and heating substances,
3. Measuring cylinder – Measuring cylinder is used to measure the volume of liquids.
4. Conical flask – Conical flask is used for mixing or stirring liquids.

C. Answer the following in short.

Question 1.
Define chemistry.
Answer:
Chemistry is a branch of physical science that deals with the characteristics and composition of all substnaces along with the changes they can undergo.

Question 2.
What are petrochemicals ?
Answer:
A variety of products obtained from petroleum are called petrochemicals. They include petrol, diesel, kerosene, LPG, pesticides, plastics, etc.

Question 3.
What is the use of silicon and germanium ?
Answer:
Silicon and germanium are non-metals which have the property of electrical conductivity. This makes them useful in the electronic, industry for the manufacture of electrical circuits in radios, TVs, computer chips, solar electric cells, etc.

Question 4.
Name some building materials manufactured by chemical processes.
Answer:
Basic building materials such as cement, mortar, bricks, steel, paints, varnishes, etc. are manufactured by chemical processes.

Question 5.
Why is a wire gauze placed under glass apparatus when heated ?
Answer:
Wire gauze helps in heating glass apparatus evenly and therefore, reducing the chances of breakage. Hence, it is placed under glass apparatus when heated.

Living Science Chemistry Class 6 ICSE Solutions

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