|
Iron filings and sulphur were mixed together and divided into two parts ‘A’ and ‘S’. Part ‘A’ was heated strongly while Part ‘S’ was not heated
|
|
0
|
4957
|
March 19, 2018
|
|
Show diagrammatically how water is purified in the waterworks system and list the processes involved
|
|
0
|
1890
|
March 19, 2018
|
|
Classify each of the following as a physical or a chemical change. Give reasons
|
|
0
|
6270
|
March 19, 2018
|
|
You are provided with a mixture containing sand, iron filings, ammonium chloride and sodium chloride
|
|
0
|
16916
|
March 19, 2018
|
|
A child wanted to separate the mixture of dyes constituting a sample of ink
|
|
0
|
13932
|
March 19, 2018
|
|
Fractional distillation is suitable for separation of miscible liquids with a boiling point difference of about 25 K or less
|
|
0
|
8383
|
March 19, 2018
|
|
A group of students took an old shoe box and covered it with a black paper from all sides
|
|
0
|
14471
|
March 19, 2018
|
|
Distinguish between compounds and mixtures
|
|
0
|
7347
|
March 19, 2018
|
|
Distinguish between metals and non-metals
|
|
0
|
8284
|
March 19, 2018
|
|
Distinguish between physical change and chemical change
|
|
0
|
16860
|
March 19, 2018
|
|
Differentiate between a true solution and a colloid
|
|
0
|
3975
|
March 19, 2018
|
|
Classify the following into elements, compounds and mixtures
|
|
0
|
4254
|
March 19, 2018
|
|
Classify the following into metals, non-metals and metalloids:
|
|
0
|
3720
|
March 19, 2018
|
|
Non-metalsare usually poor conductors of heat and electricity.They are non-lustrous, non-sonorous, non-malleable and are coloured
|
|
0
|
997
|
March 19, 2018
|
|
On heating, calcium carbonate gets converted into calcium oxide and carbon dioxide. Is this a physical or a chemical change?
|
|
0
|
5456
|
March 19, 2018
|
|
Name the process associated with the following: Dry ice is kept at room temperature and at one atmospheric pressure
|
|
0
|
2513
|
March 19, 2018
|
|
Suggest separation technique (s) one would need to employ to separate the following mixtures: Mercury and water
|
|
0
|
12649
|
March 19, 2018
|
|
What would you observe when a saturated solution of potassium chloride prepared at 60°C is allowed to cool at room temperature?
|
|
0
|
1722
|
March 19, 2018
|
|
State the principle of separating two immiscible liquids by separating funnel
|
|
0
|
18507
|
March 19, 2018
|
|
Describe any three properties of colloid
|
|
0
|
6525
|
March 19, 2018
|
|
Identify the dispersed phase and dispersing medium in the following colloids
|
|
0
|
4407
|
March 19, 2018
|
|
Is water an element or a compound? Give reason in support of your statement
|
|
0
|
7111
|
March 19, 2018
|
|
Which of the following are not compounds?
|
|
0
|
4861
|
March 19, 2018
|
|
Give two points of differences between an element and a compound
|
|
0
|
1691
|
March 19, 2018
|
|
Classify the following as physical or chemical properties:
|
|
0
|
860
|
March 19, 2018
|
|
Rain water stored in a tank contains sand grains, unfiltrable clay particles, calcium carbonate, salt, pieces of paper and some air bubbles
|
|
0
|
11085
|
March 19, 2018
|
|
Define chromatography and give its one application
|
|
0
|
8420
|
March 19, 2018
|
|
While diluting a solution of salt in water, a student by mistake added acetone (boiling point 56°C)
|
|
0
|
1799
|
March 19, 2018
|
|
What do you understand by the term distillation? Give its one application
|
|
0
|
4790
|
March 19, 2018
|
|
Smoke and fog both are aerosols. In what way are they different?
|
|
0
|
2892
|
March 19, 2018
|