what is magnet ? what is physical change?
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Answer:
A magnet is an object (generally a metal) that has a north and south pole, such that opposite poles attract and like poles repel. A magnet contains electrons that have both uneven orbits and uneven spins.
A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not. Physical changes can further be classified as reversible or irreversible. The melted ice cube may be refrozen, so melting is a reversible physical change.
Answer:
Magnets are rocks or metals that create an invisible field around themselves. This field attracts other magnets and certain metals. The presence of a magnetic field is why you can cover a metal refrigerator door with magnets. A magnetic field is concentrated around the ends of magnets. These ends are called poles.
Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.
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