Laws Of Chemical Combination
Chapter Name : Atoms And Molecules |
Sub Topic Code : 102_09_03_01_02 |
Topic Name : Laws Of Chemical Combination |
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Sub Topic Name : Law Of Constant Proportions |
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Introduction
Discuss “Can a same compound have different number of atoms of same element in molecules?”
Pre-Requisites:
chemical compounds, chemical reactions
Activity:
We do so many reactions in lab. Measure the weights before doing and after doing.
Real Life Question:
“If we change the proportion of elements does the compound remains the same?”
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Law of constant proportions | In a chemical substance the elements are always present in definite proportions by mass |
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 law helps us to predict how much product we will obtain in a chemical change
Practical examples around us
| Examples | Explainations |
|---|---|
| if 9 g of water is decomposed, 1 g of | Law of constant proportion and conservation of mass |
What you learn in Theory:
Law of constant proportion
What you learn in Practice:
In a chemical substance the elements are always present in definite proportions by mass