1. False: during the physical change, a new kind of matter is not formed. The matter might change its state (for example, it might turn from liquid to gas), but it will still be the same matter.
2. False: the physical change does not alter the particles that the materials is made of. However, the distance between the particles or the motion of the particles might change.
3. True. Melting is a physical change, because...
1. False: during the physical change, a new kind of matter is not formed. The matter might change its state (for example, it might turn from liquid to gas), but it will still be the same matter.
2. False: the physical change does not alter the particles that the materials is made of. However, the distance between the particles or the motion of the particles might change.
3. True. Melting is a physical change, because it changes the state of matter - solid becomes liquid - but the matter itself remains the same.
4. True. Adding heat to material typically causes a physical change. The heat adds energy to the particles, which then move faster, and the distance between the particles (typically) increases. Adding heat might cause boiling (liquid becoming gas) or melting (solid becoming liquid) or even sublimation (solid becoming gas).
5. Not sure what is meant by particles getting "harder", but probably false. Freezing changes the distance between the particles, and the type of motion of the particles, but the particles themselves do not change, even if a large chunk of them become a "harder" solid substance.
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