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What type of matter do not change?
solid
How does e equals mc2 show that matter can produce energy?
A better equation would be dE=dm*c2 showing that a change in mass is equivalent to a change in energy
Why can you change the order of the addends in the commutative property?
This is possible because the order of the addends does not matter. For example, 3+8 is the same as 8+3. No matter how you list the addends, the sum will always be the same.
How does an iron ball and water differ with respect to their shape size compressibility and diffusion?
because of the change of state of matter
Does the amount of a particular matter affect its density?
The simple answer to this would be no. Density is the mass per volume of a substance so if you were to add either one of these quantities the other would have to rise by a proportional amount and the density would remain constant. However this become untrue when the amount of matter you are dealing with become on the order of a planetary mass. This much matter will produce a gravitational field which will cause pressures to result that will be enough to invoke a phase change in the portions from the center of the mass on outwards. In this case the density will change with the change in phase.
