Physical and Chemical Change Notes. SQ3R book starting on page 356.
Law of Conservation of mass- says that mass is not created or destroyed in ordinary p and c reactions.
Physical change- a change of matter from 1 form to another a change in chemical properties.
Physical changes in nature ex- rock eroding, water freezing.
physical changes in industry – processing sugar cane
1. sugar cane is growing
2. s.c. is cut
3. s.c h2o evaporated
4. s.c- refined
5. s.c-yum!
same molecules as when stared. it just went through a physical change.
Chemical changes in our world
Chemical changes- when a new substance is formed and their identities are different from the original matter.
changed identities and properties.
new substance if formed
light produced.
fizzing and foaming.
heat is produced
Flamingo- digest shrimp and algae which produce the color pink in their feathers.
Photosynthesis
chemical change in industry-
making a bike, refining oil
Reversible- most physical changes are reversible
some chemical changes are reversible.
making a bike