Question

performing and observing the following reactions and classifying them into:combination reaction b) decomposition reaction c) displacement reactions d) double displacement reaction 1)action of water on quicklime 2)action of heat on Phosphorus sulphate crystals 3)Iron nails kept in copper sulphate solution 4)reaction between Sodium sulphate and Barium Chloride solutions

Answer 1

Procedure:
As performed in a real lab:

Take a small quantity of calcium oxide (quick lime) in a beaker.
Slowly add water to the quick lime taken in the beaker. Pour enough water so that the quick lime remains submerged in the water.
Touch the beaker with fingers to note the temperature.
Leave the beaker undisturbed for some time.
Take a small quantity of clear solution from the beaker in a test tube and blow exhaled air into the lime water.
Simulator Procedure (as performed through the Online Labs)

Drag the spatula containing quicklime over to the empty beaker to transfer the contents into it.
Drag the beaker containing distilled water to pour it into the beaker containing quick lime.
Wait for some time till the quick lime reacts with water to form a suspension of slaked lime.
You can see that the thermometer shows an increase in temperature.
View the inference by clicking on the inference icon.
Click on the ‘Next’ button to go to the next process.
You will get a clear solution of lime water as the suspension of slaked lime settles down at the bottom of the beaker.
Now, drag the dropper and dip it in the beaker to suck lime water in it and then drag it towards the test tube to pour the lime water into it.
Drag the cork with the bent tube towards the test tube to close it.
Click on the ‘Next’ button to go to the next process.
Click on the blow button to blow in exhaled air into the test tube containing lime water.
The lime turns milky.
View the inference by clicking on the inference icon.
You can click on the ‘Reset’ button to redo the experiment.
Note: Click on the ‘HELP’ button to see the instructions

Observations:
When water is added to quick lime, a suspension of slaked lime is formed.
On touching the beaker we feel it is hot.
A clear solution appears as the suspension of slaked lime settles down to the bottom of the beaker.
On blowing exhaled air that contains sufficient carbon dioxide, lime water turns milky.
Inferences:
Quick lime reacts vigorously with water to produce slaked lime releasing a large amount of heat. So the reaction is highly exothermic.



Slaked lime is only slightly soluble in water, so it forms a suspension of slaked lime in water.
The clear solution obtained after the suspension settles is called lime water.
Exhaled air contains CO2 which turns lime water milky.
Calcium oxide and water react to form only a single product, calcium hydroxide. So the reaction is a combination reaction.
Precautions:


Enjoy your experiment!!
And ask one question at a time....yuo can't expect everything.

Answer 2

D =4
C =3
B=2
A=1
Hope this helps you