Unit 3
Matter Around Us
Learning Objectives
* To understand
molecules of elements and compounds
* To recognize the
symbols of common elements
* Able to calculate
atomicity of commonly used elements
* To recognize the
occurrences of elements and compounds in nature and human body / air
* To understand the
effects of temperature on solid, liquid and gas
Recap
We knew that everything we see
around, that occupy space and have mass, is called matter. Heat, light and
sound occupies space, but does not have mass. Hence these are not matter. Do
you know what is matter is composed of? We studied earlier that matter is
composed of tiny little particles, which cannot be seen with naked eye. Let us
understand what these particles are?
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