Laws Of Chemical Combination
Chapter Name : Atoms And Molecules |
Sub Topic Code : 102_09_03_01_01 |
Topic Name : Laws Of Chemical Combination |
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Sub Topic Name : Law Of Conservation Of Mass |
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Introduction
Discuss “When we react two substances, their properties change. Can net mass change in any reaction?”
Pre-Requisites:
What is mass
Activity:
We do so many reactions in lab. Measure the weights before doing and after doing.
Real Life Question:
“Thousands of reaction go on continuously in your body. Does your mass changes in a minute when you weigh yourself?”
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Law of mass conservation | Law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Perform any small reaction in a closed box in your class | Measure the weight of everything before reaction and after reaction |
Real life uses :
This conservation of mass law helps us knowing more about the reaction
Practical examples around us
| Examples | Explainations |
|---|---|
| Everything | In all chemical reactions the mass is conserved. If there is loss in mass there must be something else happening e.g. vaporization |
What you learn in Theory:
Mass conservation law
What you learn in Practice:
Mass remains conserved in any reaction, we cannot destroy or create matter