Physical and Chemical
a property (as color, hardness, boiling point) of matter not involving in its manifestation a chemical change
This picture has rough wood planks. Each of the planks are different colors. Some are orange, and some are blue.
Like wood in the picture above, rocks are rough, but rocks can also be smooth. iPads are smooth too, but they are also thin and tall. Trees are also tall and their trunk is brown.
a property or characteristic of a substance that is observed during a reaction
The ash below the burning wood is a chemical property, because we saw the wood burn and turn into ash.
Like the wood, fabric has the ability to burn or flammability. Another chemical property is the ability to rust. Metal can rust and silver can tarnish.
a usually reversible change in the physical properties of a substance, as size or shape
This paper has been cut. That is a physical change because it's still paper, it has just changed the appearance.
When you paint the walls of your house you are only changing the appearance, because underneath the layer of paint is still the wall. Also when you break a rock it is still rock. Or when you get a paper towel wet it is still paper.
The five indicators are:
- Production of light
- Production of a precipitate
- Production of a gas
- Color change
- Change in temperature
a usually irreversible chemical reaction involving the rearrangement of the atoms
And you can't turn it back
When wood burns it turns into ash and you can't turn it back. When you crack and egg and cook it, you can't turn it back into a closed egg. And when milk curdles you can't make it fresh milk again.