1. True or False
1. Useful materials may also bring hazards.
2. Materials can only be classified as useful only.
3. The presence and absence of oxygen can bring
changes to a material.
5. Knife is an example of useful but harmful
matrials.
6. Materials are are the substances that are used
to manufacture products,
7. Materials are considered useful when it harms
people, animals and environment.
8. Matter undergoes changes such as Mechanical
and Chemical,
9. Oxidation is a change where new materials is
formed.
10. The change of state in matter is considered
Physical Change.​