Alloys - Compositions, Properties and Uses
① Steel
Components: Iron, Carbon
Properties: Hard and Strong
Uses:
- Construction of buildings and bridges,
- manufacture of ships
- manufacture of spare parts for automobiles
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Nostrils: ⇅ |
Air usually enters the body through the nostrils. |
Nasal cavity: ⇅ |
Air is filtered. The moist surface of the lining of the nasal cavity, and the hairs growing from its sides, remove some of the tiny particles of dirt in the air. In addition, as the inhaled air passes through the nasal cavity, its temperature is brought close to that of the body, and it takes up water vapour so that it becomes more moist than before. |
Solution | PH range |
---|---|
HCL | 1.0 - 2.0 |
Gastric Juices | 1.4 - 2.0 |
Lemon Juice | 2.0- 3.0 |
Vinegar | 4.0 |
Tomato Juice (Oxalic Acid) | 4.1 |
Coffee | 5.0 |
Milk (Lactic Acid) | 6.5 |
Structure Of Leaf credits: Zephrys, undr CCAS 3.0, Wikimedia Commons |
Fossil Fuels Energy | Solar Energy | |
---|---|---|
1. | Fossil energy can be used day or night. | Can be used in day time. We need to store its energy to use it at night. |
2. | The stock of fossil energy is limited. e.g. coals will last for next 200 years. | Sun’s energy is unlimited. |
3. | Fossil energy is non-renewable. It takes millions of year to produce fossil fuel. | Solar energy is renewable source of energy. |
4. | Give pollution. | Pollution Less |
5. | Fossil fuels release energy when they are burnt in air. | Solar radiation carry packets of energy due to fusion reaction in the sun. |
Property | Metals | Non Metals |
---|---|---|
Physical State | Most metals are solids at room temperature except mercury which is a liquid. Gallium and Cesium also changes into liquid at slightly above room temperature. | Non Metals exist in all states. Eleven are gases, bromine is liquid while others are solids. |
Melting and Boiling Point | Generally have high melting and boiling points. (Exceptions are Gallium, Mercury, Sodium and Potassium.) | Generally they have low melting and boiling points. Exceptions are: Carbon, Boron and Silicon. |
Density | They have high density except Sodium and potassium. | Low denisty (Diamond is an exception.) |
Lusture | Metals shine and are lustrous. | Non-metalls appear dull. (Exceptions are Diamond, graphite and iodine.) |
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