any object that has a definite shape and has tightly packed molecules
a state of matter that can be easily poured and takes the shape of its surroundings
a state of matter that is almost always invisible and expands freely
a type of change in matter that can always be changed back
another type of change that can not be changed back and causes a change in the chemicals
anything that takes up space and has weight (mass)
matter that is made up of a single type of particle
the simplest form of matter
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