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CHEMISTRY LEVEL 3


1. GAS LAWS
2. THE MOLE: Formulae and Chemical Equations
3. ORGANIC CHEMISTRY 1
4. NITROGEN AND ITS COMPOUNDS
5. SULPHUR AND ITS COMPOUNDS
6. CHLORINE AND ITS COMPOUNDS
7. A guide to chemical tests based on this module
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Sulphur and its Compounds: Chemical properties of sulphur

5.0 Sulphur and its Compounds


5.1.4: Chemical properties of sulphur


Burning in oxygen (and air)

The following video clip and photographs show the burning of sulphur in air. The whiteness seen on the deflagrating spoon is an effect of the camera lens, not the actual colour.


(courtesy Youtube-Combustion of sulphur in oxygen by Chemistry Channel)
   Burning of sulphur in oxygen , Sulphur and some of its compounds,  Sulphur and its compounds,high school chemistry

Figure 5.1.4(a): Burning of sulphur in oxygen
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQ5mhH8HkMPzZvfpvmkaVi1rEet31xNDnfeeg&usqp=CAU


Questions 5.1.4(a)

  1. Outline a three-step procedure you would use to demonstrate the burning of sulphur in air, using a gas jar full of oxygen gas.
  2. State the observations made during the burning.
  3. Sulphur shows a valency of 4 in its reaction with oxygen. Name the product and state its formula.
  4. Write a chemical equation for the burning of sulphur in oxygen (or air).
  5. Determine the volume of oxygen gas at room temperature and pressure required to react completely with 16 g of sulphur (S = 32; molar gas volume at r.t.p = 24 dm3).

Answers to Questions 5.1.4(a)


Direct combination of sulphur with iron

The following photographs show what happens when a mixture of iron dust and sulphur powder is strongly heated in a Bunsen flame.


  Reaction between sulphur and iron, Sulphur and some of its compounds,  Sulphur and its compounds,high school chemistry

Figure 5.1.4(b): Reaction between sulphur and iron


Questions 5.1.4(b)

  1. State the observations made.
  2. Iron shows a valency of 2 in its direct combination with sulphur. Name the product and state its formula.
  3. Write an equation for the reaction between sulphur and iron.
  4. Explain the observation made on the cooler parts of the test tube.

Answers to Questions 5.1.4(b)


Direct combination with copper

The following photographs show what happens when a mixture of copper turnings and sulphur powder is strongly heated in a Bunsen flame.


 Direct combination of sulphur with copper,  Sulphur and some of its compounds,  Sulphur and its compounds,high school chemistry

Figure 5.1.4(c): Direct combination of sulphur with copper


Questions 5.1.4(c)

  1. Describe the observations made.
  2. Copper and sulphur show a valency of 1 and 2 respectively in their direct combination with each other. Name the product and state its formula.
  3. Write an equation for the reaction between sulphur and copper.

Answers to Questions 5.1.4(c)


Direct combination of sulphur with hydrogen

The following photographs show what happens when hydrogen gas is blown over burning sulphur.


 Direct combination of sulphur with hydrogen, Sulphur and some of its compounds,  Sulphur and its compounds,high school chemistry

Figure 5.1.4(d): Direct combination of sulphur with hydrogen


Caution: Do not attempt to lower burning sulphur into a gas jar full of hydrogen.

Questions 5.1.4(d)

  1. Give two reasons why it is not advisable to react sulphur with hydrogen by lowering burning sulphur into a gas jar containing hydrogen.
  2. Describe the observations made.
  3. Sulphur shows a valency of 2 in its compound with hydrogen. State the formula of the compound.
  4. Write an equation for the reaction between sulphur and hydrogen.

Answers to Questions 5.1.4(d)