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Booklet # 1 / First Semester
Subject : Chemistry
Name : ………………………………………..
Grade : Seven Section : …………………….
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Question1.
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Question2.
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Question3.
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Question4.
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Question5.
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Question 6 .
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Question 7.
Question 8.
Question 9.
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Question 10.
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Question 11.
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Question 12.
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Question 13.
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Question 14
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Question 15.
Question 16.
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Question 17.
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Question 18.
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Question 19.
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Question 20.
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Lab 1
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Lab 2
The reaction between iron and sulphur
Iron filings, sulphur powder, heat-proof test-tubes, heating apparatus, a magnet.
The reaction between iron and sulphur
Start by examining samples of iron and sulfur.
What type of elements are iron and sulfur?
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Where in the Periodic Table are they found? What properties would you expect iron and
sulfur to have ?
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Test iron filings and sulphur with a magnet to show that iron filings are magnetic and
sulphur is not.
Mix iron filings and sulphur together. Examine the mixture. What can you tell about its
appearance?
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What would you expect the properties to be like? How could you separate iron from
sulphur?
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Demonstrate using a magnet how to separate some of the iron filings from the mixture.
Heat the mixture strongly until it begins to react.
Let the product cool and examine it. Compare the properties of an iron/sulphur mix
with the product of the chemical combination between the elements.
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Draw diagrams to show the arrangement of particles in iron, sulphur, mixture of iron and
sulphur and in iron sulphide. Describe what has happened in the reaction. They should use
the term ‘chemical bond’ in their explanations.
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Lab 3
1. We start with filtering the sand and salt solution
2. After filtration is complete we need to separate salt and water. How do we do that?
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3. Draw the set of apparatus needed for step 2
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Lab 4
Crystallization of acids and bases
Apparatus needed:
1.Sulfuric acid 0.4 M
2. Zinc carbonate
3. Measuring cylinder
4. Beaker
5. Filter funnel and filter paper
6. Bunsen burner
7. Tripod
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Lab 5
Chromatography
Apparatus needed
1. Filter paper
2. Ruler
3. Pencil
4. Beaker
5. Ethanol
6. Dye (( different colors))
In the box provided draw the method of chromatography
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Lab 6
Preparing soluble salts
There are two methods of preparing soluble salts
Experiment 6a: Preparation of Soluble Salts by adding Acid to a solid Metal, Base or
Carbonate
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Method:
Add dilute acid into a beaker and heat using a bunsen burner flame
Add the insoluble metal, base or carbonate, a little at a time, to the warm dilute
acid and stir until the base is in excess (i.e. until the base stops disappearing and a
suspension of the base forms in the acid)
Filter the mixture into an evaporating basin to remove the excess base
Heat the solution to evaporate water and to make the solution saturated. Check
the solution is saturated by dipping a cold, glass rod into the solution and seeing if
crystals form on the end.
Leave the filtrate in a warm place to dry and crystallize
Decant excess solution and allow crystals to dry
Write down your observations
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Lab 7
Experiment 7: Preparation of Insoluble Salts
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Method:
Dissolve soluble salts in water and mix together using a stirring rod in a beaker
Filter to remove precipitate from mixture
Wash filtrate with water to remove traces of other solutions
Leave in an oven to dry
Selecting a method of preparation
When deciding the method of preparation, if is important to first know whether the
salt being produced is soluble or insoluble.
If it is soluble than it can be prepared using either method (A or B) for preparing a
soluble salt.
If it is insoluble then it must be prepared using by precipitation
The End
