Physical Properties
Chapter Name : Metals And Non-Metals |
Sub Topic Code : 102_10_03_01_02 |
Topic Name : Physical Properties |
|
Sub Topic Name : Non-Metals |
|
Introduction
Non-metals can be present in the solid, liquid and gaseous phase. All metals are solids except mercury. When oxides of metal dissolve in water they form bases. When oxides of non-metals dissolve in water, acids are formed. Exceptions in metal and non-metal properties: Iodine is a lustrous non-metal. Some alkali metals are so soft that they can be cut with a knife. Carbon has allotropes. Ex diamond, graphite. Diamond is the hardest substance on earth.
Pre-Requisites:
Metals, non-metals
Activity:
Metals such as silver, gold have a shiny surface whereas non-metals do not.
Real Life Question:
Which is the hardest substance on earth?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Metal | Elements which are malleable and ductile and have a shiny lustre. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Periodic table | Observe how the metals and non-metals are placed in the periodic table. |
Real life uses :
To make pillars, furniture, rods, in construction.
Places to visit :
Kitchen.
Practical examples around us
| Examples | Explainations |
|---|---|
| Silver, gold, iron | All are metals. |
What you learn in Theory:
Non-metals can be present in the solid, liquid and gaseous phase. All metals are solids except mercury. When oxides of metal dissolve in water they form bases. When oxides of non-metals dissolve in water, acids are formed. Exceptions in metal and non-metal properties: Iodine is a lustrous non-metal. Some alkali metals are so soft that they can be cut with a knife. Carbon has allotropes. Ex diamond, graphite. Diamond is the hardest substance on earth.
What you learn in Practice:
Metals and non-metals have different physical properties.