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Meghna Thapar 5 years, 10 months ago
- A growth movement of a plant part in response to an external stimulus in which the direction of the stimulus determines the direction of response is called tropism.
- If the growth of a plant part is towards the stimulus, it is called positive tropism.
- If the growth of a plant part is away from the stimulus, it is called negative tropism.
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- Metals have a shining surface. This property is called metallic lustre.
- Metals can be beaten into thin sheets. This property is called malleability.
- The ability of metals to be drawn into thin wires is called ductility.
- Gold is the most ductile metal.
- The best conductors of heat are silver and copper.
- The metals that produce a sound on striking a hard surface are said to be sonorous.
- All metals except mercury exist as solids at room temperature.
- Almost all metals combine with oxygen to form metal oxides.
- Metals such as potassium and sodium react so vigorously that they catch fire if kept in the open.
- Metals react with water and produce a metal oxide and hydrogen gas.
- Metals react with acids to give a salt and hydrogen gas.
- Sodium and chloride ions, being oppositely charged, attract each other and are held by strong electrostatic forces of attraction to exist as sodium chloride (NaCl).
- Ores mined from the earth are usually contaminated with large amounts of impurities such as soil, sand, etc., called gangue.
- Metals low in the activity series are very unreactive.
- The metals in the middle of the activity series such as iron, zinc, lead, copper, etc., are moderately reactive.
- The sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is known as roasting.
- The carbonate ores are changed into oxides by heating strongly in limited air. This process is known as calcination.
- Galvanisation is a method of protecting steel and iron from rusting by coating them with a thin layer of zinc.
- An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal.
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☮???????? ??????☮ 5 years, 10 months ago
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