Atomic And Molecular Masses
Chapter Name : Some Basic Concepts Of Chemistry |
Sub Topic Code : 102_11_01_07_03 |
Topic Name : Atomic And Molecular Masses |
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Sub Topic Name : Molecular Mass |
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Introduction
Molecular mass is sum of the atomic masses of the elements in a compound.
Pre-Requisites:
Mass, atom, element, compound, atomic mass
Activity:
Observe how you would weigh a bag with assorted candies in it, or a fruit basket?
Real Life Question:
What is the weight of your tool box?
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. |
| Molecule | A molecule is the smallest particle in a chemical compound that has the chemical properties of that compound. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| A Car, a cell phone | Weight of a car is the sum of the weights of its tires, its body, its glasses and other parts. Weight of a cell phone is the sum of the weight of its body and its battery. |
Real life uses :
To calculate the weight of a collection of group of things.
Places to visit :
Garage, supermarket
Practical examples around us
| Examples | Explainations |
|---|---|
| A tool box | Weight of a tool box is the sum of the weight of the hammer, the screwdriver, the nuts and bolts and other things inside it plus the weight of the box. |
What you learn in Theory:
Molecular mass is the sum of the atomic masses of the elements in the compound.
What you learn in Practice:
Heavier molecules would have heavier atoms or would be large in size.