Mada za sehemu hiiElement, Compound And MixturesMada 4
A mixture is a substance that consists of two or more elements or compounds that are not chemically combined. The components of a mixture can be separated by physical methods, and they retain their original properties.
Examples of mixtures:
- A mixture of oxygen and hydrogen gases.
- A mixture of salt and sand.
- A mixture of water and sugar.
Magnetic separation of a mixture of sulphur and iron filings
Mixtures can be divided into two main types:
-
Homogeneous Mixture A homogeneous mixture is a mixture where the components are completely mixed and appear as one uniform substance. Example: Sugar dissolved in water – the sugar completely mixes with water and cannot be seen separately.
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Heterogeneous Mixture A heterogeneous mixture is a mixture where the components do not mix completely and can be seen separately. Example: Oil and water – the oil floats on top of the water, and they do not mix together.
A compound is a pure chemical substance that is formed when two or more different elements are combined chemically. The elements lose their original properties and form a new substance with new properties.
Examples of compounds:
- Water (H₂O) – formed by hydrogen and oxygen.
- Common salt (NaCl) – formed by sodium and chlorine.
- Sodium carbonate (Na₂CO₃) – formed by sodium, carbon, and oxygen.
- Compounds cannot be separated by physical means like filtering or evaporation.
- The properties of a compound are different from the properties of the elements that form it.
- Heat is usually absorbed or released when a compound is formed.
| Mixtures | Compounds |
|---|---|
| Components can be seen separately (especially in heterogeneous mixtures). | Components cannot be seen separately. |
| Can be separated by physical methods like filtration, evaporation, or decanting. | Can only be separated by chemical methods. |
| Elements or compounds are mixed in any proportion. | Elements are combined in fixed proportions. |
| No chemical reaction takes place when the mixture is formed. | A chemical reaction occurs when the compound is formed. |
| The mixture shows the properties of the individual substances. | The compound has different properties from the elements used. |
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