Matter
Learning outcomes:
* To understand about elements and compounds
* To differentiate between elements and compounds
The appropriate video is given below:
Notes:
* Elements are pure substances that exhibit all the properties of matter
* There are 118 elements known to us and they can be metals, non-metals, metalloids and inert gases.
Ex: Hydrogen, Oxygen
* Compounds are pure substances that are formed by the combination of two or more elements.
* Elements combine in fixed ratio to form a compund.
Ex: H2O, CO2
Water has hydrogen and oxygen combining in 2:1 ratio.
Assessment questions:
* Are elements pure substances?
* What is the first element of the periodic table?
* In what ratio does the elements in Carbon dioxide combine?
* How are compounds useful to us?
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