Tuesday 8 December 2015

Lecture 9 – Elements & Compounds

 ACKNOWLEDGEMENT:

Figure
Source of Figure
Figure 11a
www.micromountain.com
Figure 11b
www.techmoris.com
Figure 12a
www.reddit.com
Figure 12b
thefeedingdoctor.com

Element:

An element is a collection of numerous same type of atoms.
Figure 11 shows a) an atom and b) its element

Figure 11a:

Figure 11b:


Mixtures:

Mixture is a physical combination of 2 or more elements, such that they can be separated by physical means.

Example:

Air is a mixture of Nitrogen, Oxygen, Carbon dioxide, Water vapours, and Inert gases, all of which can be separated by the Fractional Distillation of Liquid Air.

Compound:

A compound is a chemical mixture of 2 or more elements, such that they cannot be separated by physical means.

Molecule:

A molecule is the smallest unit of a compound, and many same molecules, make up a compound.

Figure 12 shows a) a molecule of water and b) its compound

Figure 12a:


Figure 12b: