Physical And Chemical Changes
Chapter Name : Is Matter Around Us Pure? |
Sub Topic Code : 102_09_02_04_01 |
Topic Name : Physical And Chemical Changes |
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Sub Topic Name : Physical And Chemical Changes |
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Introduction
Properties of physical and chemical change
Pre-Requisites:
Basic knowledge on physical and chemical properties
Activity:
In a beaker put some salt in water. Observe the salt changes its state but it can regain its original state when the water gets evaporated. It’s a physical change
Real Life Question:
Why do we see iron nail getting rust?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Physical change | Change in the form of chemical substance but not the chemical composition |
| Chemical change | Change in which composition is changed and a new product is formed. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Identification between chemical and physical change | Identify the changes by looking at the properties of output. |
Real life uses :
Salt is mixed with water for purification. Salt is changed its state.
Practical examples around us
| Examples | Explainations |
|---|---|
| Rusting of iron is a chemical change .why? | Rust is hydroxide form of Iron. When Iron reacts with water in the air it undergoes a chemical change at the surface, so it’s a chemical change. |
What you learn in Theory:
Properties of chemical and physical change
What you learn in Practice:
Difference and identification of change involving a physical change or a chemical change.