ICSE Class 6 Chemistry · Selina Solutions Concise Chemistry Class 6 ICSE · 13 solved questions
Evaporating dish is made of:
porcelain
Reason — Evaporating dish is a bowl-shaped container made of porcelain. It is used for evaporating solutions or liquids.
Glass can break under high heat and is not commonly used for evaporating dishes. Metals may react with chemicals, so they are not preferred. Plastic cannot withstand high temperatures.
Spirit lamp is made of:
all of the above
Reason — Spirit lamp is a type of burner made of glass, brass or steel containing a wick. Spirit is used as fuel. It is used to heat up substances. Glass is used for spirit lamps in laboratories because it is transparent and heat-resistant. Brass is used to make durable spirit lamps. Steel is used for stronger, long-lasting spirit lamps.
The apparatus used to measure an accurate volume of a liquid is:
measuring cylinder
Reason — A measuring cylinder is a cylindrical glass apparatus graded in millilitres, decilitres and centilitres. It is used to measure the volume of liquid substances.
Beaker is used for mixing and heating, but gives only rough volume measurements. Conical flask is used for mixing solutions, not for accurate measurement. Test tube is used for small experiments, not for measuring volume.
To pass a gas from one vessel to another, you will use a:
delivery tube
Reason — A delivery tube is made up of glass and is used to transfer fluids or gases from one vessel to another.
Gas jar is used to collect gases, not to transfer them. Glass rod is used for stirring, not for gas transfer. Test tube is used to hold substances, not for transferring gas.
To prevent the escape of a gas from a gas jar, you will cover its mouth with a:
watch glass
Reason — A watch glass is made up of glass. It is used to cover beakers or gas jars, as it prevents gas from escaping. It is also used like an evaporating dish for very small amounts of liquid.
Crucible is used for heating substances at high temperatures. Beaker is used for holding liquids, not for covering gas jars. Round-bottom flask is used for heating and reactions, not for covering.
(a) Experiment and ............... are the two important basics of chemistry.
(b) A porcelain dish is used ...............
(c) ............... is used to hold the test tube while it is hot or being heated.
(d) ............... is used for grinding and crushing solid substances into a powder.
(e) Glass apparatus is made of ............... or ............... glass.
(a) Experiment and observation are the two important basics of chemistry.
(b) A porcelain dish is used for evaporating solutions.
(c) Test tube holder is used to hold the test tube while it is hot or being heated.
(d) Mortar and pestle is used for grinding and crushing solid substances into a powder.
(e) Glass apparatus is made of pyrex or borosil glass.
Write true or false against the following statements and correct the false ones.
(a) A glass funnel is used to pour off liquids. ...............
(b) A test tube is used to test liquid chemicals. ...............
(c) A mortar and pestle is used for evaporation. ...............
(d) A glass rod is used to stir solutions. ...............
(e) A round-bottom flask is used to store chemicals. ...............
(a) True
(b) True
(c) False
Correct Statement — A mortar and pestle is used for grinding and crushing solid substances.
(d) True
(e) False
Correct Statement — A round-bottom flask is used to hold solutions during experiments.
Match the items in column A with their respective functions in column B.
| Column A | Column B |
|---|---|
| (a) Iron stand | (i) To boil chemicals |
| (b) Test tube | (ii) To keep solutions |
| (c) Funnel | (iii) To stir solutions |
| (d) Beaker | (iv) To support apparatus |
| (e) Glass rod | (v) To transfer liquids |
| Column A | Column B |
|---|---|
| (a) Iron stand | (iv) To support apparatus |
| (b) Test tube | (i) To boil chemicals |
| (c) Funnel | (v) To transfer liquids |
| (d) Beaker | (ii) To keep solutions |
| (e) Glass rod | (iii) To stir solutions |
From what materials are the following made up of?
(a) Test tube rack
(b) Test tube holder
(c) Measuring cylinder
(d) Wire gauze
(e) Mortar and pestle
(a) Wood or plastic
(b) Metal
(c) Glass
(d) Iron and asbestos sheet
(e) Porcelain
Mention one use of each of the following equipments:
(a) Spirit lamp
(b) Test tube
(c) Conical flask
(d) Evaporating dish
(e) Wire gauze
(f) Beaker
(g) Mortar and pestle
(h) Measuring cylinder
(i) Glass tube
(j) Gas jar
(k) Reagent bottle
(a) To heat up substances
(b) Test tube is used to conduct tests with small quantities of chemicals.
(c) To hold sufficient quantities of solutions during experiment.
(d) It is used for evaporating solutions or liquids.
(e) To keep glass apparatus on it while heating is in progress.
(f) For preparation and keeping of solutions.
(g) To grind and crush solid substances into powder.
(h) To measure the volume of liquid substance.
(i) It is used to transfer fluids or gases from one vessel to another.
(j) For collecting gas.
(k) To store chemicals.
Answer the following questions in brief:
(a) Why is chemistry known as an experimental science?
(b) Why are most of the apparatus made of glass?
(a) Chemistry is the branch of science which is mostly based on experiments and observations. An experiment performed under controlled conditions is an activity where we observe a natural or an artificially created phenomenon. Hence, chemistry is known as an experimental science.
(b) Most laboratory apparatus are made of glass due to the following reasons:
List any five precautions to be taken while performing an experiment in a chemistry laboratory.
Label the marked equipments and apparatus in the diagram given below.
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