Properties and Changes
Chemical and Physical Changes and Properites
Combustion, corrosion, tarnishing, and rust are a few examples.
It is important to understand chemical properties for things like safety, how to use a chemical to get results, and so you can make things like a fire.
Examples are burning, cooking, rusting and tarnishing
Understanding chemical change is important for things like understanding cooking and fire starting.
Examples would include color, texture, shape, and size.
Understanding this is important so you can observe the world around you and make deductions based on what knowledge can be seen.