Question

1. You are given a mixture of iron fillings and sulphur powder. How will you separate them from the mixture?

Answer 1

Answer:

with the of magnetic separation method

Explanation:

when you brought a magnet near to the this mixture then iron fillings attracted towards the magnet then sulphur powder remains behind.

Answer 2

Answer:

1. Prepare a homogenous mixture containing iron powder and sulfur powder in the ratio 7:4 by

mass. Do this by weighing out 7 g of iron powder and 4 g of finely powdered sulfur onto separate

pieces of filter paper (or use weighing boats). Mix the two powders by pouring repeatedly from one

piece of paper to the other until a homogeneous mixture (by appearance) is obtained.

2. Note the appearance of the pure elements and the mixture. Demonstrate that iron can be

separated from the mixture by physical means. Do this by wrapping the end of a small bar magnet

in a paper tissue or cling film, and dipping it into a teaspoon-sized heap of the mixture on a watch

glass. The iron will be attracted, but the sulfur remains on the watch glass.

3. Place about 2 g of the mixture into a borosilicate test-tube.

4. Insert a plug of mineral wool (mineral fibre) into the mouth of the test-tube. Clamp the test-tube

as shown in the diagram.

5. Heat the powder mixture at the base of the test-tube – gently at first and then more strongly (use

a blue flame throughout). Heat until an orange glow is seen inside the test-tube. Immediately stop

heating. Let the students see that the glow continues and moves steadily through the mixture.

6. Allow the tube to cool down. At this point the students could carry out their own small-scale

version of the reaction.

The substance from the tube is a new compound called iron sulfide.

7. Once cool, it is possible to break open the test-tube to show the appearance of the product,

iron(II) sulfide. The test-tube can be broken open using a pestle and mortar. It is advisable to wear

protective gloves.

8. Test the iron sulfide with a magnet.

Safety

Wear eye protection throughout and ensure that the lab is well-ventilated.