1. Chemical & physical properties
8th Grade Science

2. Everything is made of chemicals
Everything is made of chemicals. There are 92 natural chemicals or elements. They are arranged on the periodic table. Each element is composed of extremely small particals called atoms.

3. All atoms of a given element are identical
All atoms of a given element are identical. Atoms of different elements have different properties. Each chemical has predictable properties that distinguish or separate it from other chemicals.

4. The properties of matter can be grouped into two categories: physical and chemical properties.

5. Physical properties... Describe what a substance is like or it’s ability to change in some way but it still stays the same molecule.
Examples:
color
density
odor
melting point
boiling point
hardness

6. What are some physical properties of vinegar?
smell
its a liquid
clear
taste bitter

7. Ex: Flammability & Reactivity
Chemical properties...
describe an object/substances’ ability to change into something new. We use these properties to distinguish chemicals from one another.
Ex: Flammability & Reactivity

8. Some examples of chemical properties are...
paper burns
iron rusts
silver doesn’t react w/water
nitrogen doesn’t burn

9. In each of these, the substances chemical property is its tendency to:
react
tarnish
corrode
Explode
(bubbles,
Smell)

10. Physical vs. chemical properties
Wood
Physical Property:
grainy texture
Chemical Property
Flammable

11. PHYSICAL VS. CHEMICAL PROPERTIES Baking Soda white powder
Physical Property:
white powder
Chemical Property
reacts with vinegar to produce bubbles

12. Chemical vs. physical properties
Iron
Physical Property:
Malleable (able to be shaped)
Chemical Property
Reacts with oxygen to form rust