Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
27 Cards in this Set
- Front
- Back
- 3rd side (hint)
Metals are classified into |
1.Metals 2.Non Metals 3.Metalloids |
|
|
Metalloids Definition |
Metalloids are the elements which possess both the properties of metals as well as non metals. |
Possess both properies Eg. 1 Silicon 2. Germanium 3. Antimony Sili german ant |
|
Physical properties of metals
1.Physical State |
1.They are solid at room temperature
Exception: Mercury Gal lium
|
Solid at? Except merc gall |
|
Physical properties of metals 2. Lusture |
Metals in their pure state have a Shine and can be polished to give a highly reflective surface. |
Have a ? Can be ? To give? |
|
Malleability |
Metals have the ability to withstand hammering and can be made into thin sheets. |
WITHSTAND Hammering |
|
DUCTILITY |
The ability of the metals to be drawn into thin wires is called ductility. Gold and silver are the most ductile metals. Fact: 1 gram of gold 2 km length. |
Drawn thin wires. |
|
Conduction of Heat |
Metals have high melting point Silver and Copper best Lead and mercury poor conductor |
|
|
Conduction of electricity Electric wires made of copper. Why |
Electric wires are made of copper having a outer coating of PVC since pvc is bad conductor of electricity. POLY VIN YL chloride |
|
|
Hardness |
Alkali metals like Sodium and Potassium are soft metals and can be with ๐ช |
|
|
Which element Highest melting point
|
Tungsten |
|
|
Low melting points |
Sodium and Potassium |
|
|
Sonorous |
The metals that produce a sound ๐๐๐on striking a hard substance. |
|
|
Physical properties non metals State |
1. Are either in solid or gaseous state Exception Bromine liquid |
|
|
Physical properties non metals lusture |
2. Do not have lusture Except Iodine
|
|
|
3.Physical properties non metals hardness |
3 Do not possess the property of hardness except Carbon in the form diamond
Carbon highest substance known high melting and boiling point. |
|
|
3.Physical properties non metals hardness |
3 Do not possess the property of hardness except Carbon in the form diamond
Carbon highest substance known high melting and boiling point. |
|
|
Physical properties non metals electricity |
4. Do not conduct electricity except graphite allotrope of carbon |
|
|
most reactive metals. |
Sodium Potassium |
|
|
Sodium GR kept in kerosene |
Sodium is the most reactive metal. S reacts with oxygen in air at room temperature to form sodium oxide. Hence kept under kerosene oil to prevent its reaction with oxygen, moisture and carbon dioxide. 4Na+O2 ๐ 2Na2O |
|
|
Sodium oxide potassiun oxide |
Na 2 O +H2O ---2NaOH K2O +H20===2KOH |
|
|
SODIUM OXIDE AND POTASSIUM OXIDE DISSOLVES IN WATER TO FORM ALKALIS. SODIUM OXIDE AND POTASSIUM OXIDE DISSOLVES IN WATER TO FORM ALKALIS. SODIUM OXIDE AND POTASSIUM OXIDE DISSOLVES IN WATER TO FORM ALKALIS. |
Na2O+H2O_____2NaOHK2O+ H2O_____2KOHSODIUM OXIDE AND POTASSIUM OXIDE DISSOLVES IN WATER TO FORM ALKALIS. |
|
|
ZINC BURNS IN AIR ONLY ON STRONG BEATING TO FORM ZINC OXIDE |
Zn+O2____2ZnO |
|
|
Iron filing burn vigorously when sprinkled in the flame of burner. |
3Fe+2O2------Fe3O4 |
|
|
Copper |
Copper is least reactive. Does not burn on heating but hot metal is coated with black colour layer of copper OXIDE. |
|
|
Aluminium develops a thin layer when exposed to air. |
4Al+ 3O 2 ------2Al2O3 |
|
|
Anodised panals |
Anodising a process of forming a thick OXIDE LAYER of ALUMINIUM. ALUMINIUM DEVELOPS A Thin OXIDE layer when exposed to air. |
|
|
Amphoteric Oxides |
Metal OXIDE are usually basic in nature. Some metal OXIDE such as aluminium oxide ZINC . Oxide React both with acid as well as base to produce salt and water. |
|