Atomic And Molecular Masses
Chapter Name : Some Basic Concepts Of Chemistry |
Sub Topic Code : 102_11_01_07_02 |
Topic Name : Atomic And Molecular Masses |
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Sub Topic Name : Average Atomic Mass |
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Introduction
Average Atomic mass is calculated taking into account the mass of each isotope of and element and its relative abundance.
Pre-Requisites:
Mass, atom, element, carbon-12, particle, Dalton’s atomic theory
Activity:
If you have 10 green apples with thin skin and 4 red apples with thick skin, the average weight of the apples would be in proportion to the number of the green and red apples.
Real Life Question:
How to calculate the average mass of a particular substance if it has many varieties?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Average Atomic mass | Average Atomic mass is calculated taking into account the mass of each isotope of an element and its relative abundance. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Green apple and red apple | A green apple with a thin skin and a red apple with a thick skin. What is the Average mass of apples in general? |
Real life uses :
When reporting averages for any substances, e.g. apple, the number of variety of each is considered, therefore, the price of a kg of red apples would be different than the price for a kg of green apples as their weights are different (apart from the quality).
Places to visit :
A fruit store, supermarket
Practical examples around us
| Examples | Explainations |
|---|---|
| Prices of different items Ex: Buying apples | If you want to tell the average weight of apple and you are given a basket full of green and red apples, you need to consider the abundance of each type of apples before finding the average weight of an apple. |
What you learn in Theory:
Average Atomic mass is calculated taking into account the mass of each isotope of and element and its relative abundance.
What you learn in Practice:
Average mass is calculated taking into account the mass of each individual variety as well as its abundance in that group.