To Prepare a Mixture and Compound Using Iron Filings and Sulphur Powder
In this article, we have discussed the preparation of a mixture and compound using iron filings and sulphur powder and distinguish them based on appearance, i.e., homogeneity and heterogeneity, behaviour towards a magnet, behaviour towards carbon disulphide as a solvent, effect of heat.
Aim
The experiment aims to prepare a mixture and compound using iron filings and sulphur powder and distinguish them based on their appearance, i.e., uniformity and non-uniformity, behaviour towards a magnet, behaviour towards carbon disulphide as a solvent and effect of heat.
Theory
A matter is anything that occupies space and has mass. Based on the composition of the substance, we can further classify matter into two kinds, i.e. mixture and pure substance. We can further divide the mixture into homogenous and heterogeneous mixtures and pure substances into elements and compounds.
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What is a mixture?
A mixture is a substance formed by physically mixing two or more substances in any proportion. It doesn’t show any chemical change and retains its constituent property. We can further divide the mixture into homogenous and heterogeneous mixtures. A homogeneous mixture has a uniform composition, while a heterogeneous mixture has a non-uniform composition.
What is a compound?
A compound is a substance formed by chemically mixing two or more substances in a fixed proportion. It shows a chemical change and doesn’t retain its constituent property. Any physical method can not separate it.
Difference between Mixture and Compound
| S. No. | Mixture | Compound |
|---|---|---|
| 1. | A mixture is a substance formed by physically mixing two or more substances in any proportion. | A compound is a substance formed by chemically mixing two or more substances in a fixed ratio. |
| 2. | A mixture can either be homogenous or heterogeneous. | The compound is always homogeneous. |
| 3. | The properties of mixtures depend on its constituent. | The properties of compounds don’t rely on its constituent. |
| 4. | Example: Mud water, sugar solution, milk, and blood. | Example: Water, baking soda and salt. |
Mixture
Separation of iron filings and sulphur powder mixture
Compound
Separation of iron filings and sulphur powder compound
Material Required
The apparatus and materials required for this experiment are as follows:
- Bunsen burner
- Tripod stand
- Wire gauze
- Test tube stand
- Hard glass test tube
- Test tubes
- Test tube holder
- China dish
- Watch glass
- Magnet
Procedure
1 . Preparation of iron filings and sulphur powder mixture
- Foremost, we took a pinch of iron filings and sulphur powder and mixed it thoroughly.
- The result was a mixture of iron filings and sulphur powder.
- We kept the mixture on a watch glass.
2 . Preparation of iron filings and sulphur powder compound
- Foremost, we took a pinch of iron filings and sulphur powder in a hard glass test tube.
- After that, we heated the reaction mixture on flame.
- The result was a mixture of iron and sulphur powder. A reaction between iron and sulphur was observed, leading to the formation of the iron sulphide compound.
- We kept the compound on a watch glass.
Observation and Inference
| S. No. | Experiment | Observation | Inference |
|---|---|---|---|
| 1. | Appearance, i.e., homogeneity and heterogeneity: Observed the appearance of both mixture and compound. | Watch glass A shows a heterogeneous mixture. In contrast, watch glass B shows a black mass of the homogenous substance. | A is a heterogeneous mixture, while B is a homogenous substance. |
| 2. | Behaviour towards a magnet: A bar magnet was rolled over both watch glasses A and B. | Iron filings cling to the magnet from watch glass A, but we observed no such behaviour in B. | Constituents of A could be separated physically by rolling a magnet, while we can not separate compound. |
| 3. | Behaviour towards Carbon disulphide as a solvent: Took components from watch glass A and B in separate test tubes and added Carbon disulphide. | In test tube A, sulphur dissolves in carbon disulphide, and iron fillings settle down. At the same time, we observed no such behaviour in B. | Constituents of A could be separated physically by dissolving in carbon disulphide, while we can not separate compounds. |
| 4. | Effect of heat: Heated both mixture and compounds. | On heating mixture from watch glass A, iron fillings and sulphur react together to form a compound, while we observed no change in B. | The mixture components from watch glass A react together to form a compound, while we observed no change in the watch glass B. |
Precautions
- Heat the iron filings and sulphur powder mixture in a china dish or a hard glass.
- Don’t inhale gases released during the experiment.
- Keep carbon disulphide away from the flame.
Viva Voce
- What is a mixture?
A mixture is a substance formed by physically mixing two or more substances in any proportion. It doesn’t show any chemical change and retains its constituent property.
- What is a compound?
A compound is a substance formed by chemically mixing two or more substances in a fixed proportion. It shows a chemical change and doesn’t retain its constituent property.
- Is a mixture a pure substance?
No, a mixture is not a pure substance.
- Is a compound a pure substance?
No, a compound is not a pure substance.
- Why do we use carbon disulphide as a solvent and not water?
We use carbon disulphide as a solvent and not water because sulphur is insoluble in water while soluble in carbon disulphide.
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