Please help!!! Science homework!!!?

Question

If matter can neither be created nor destroyed, what greater implication does that have for us on this planet? What kinds of other conclusions can you draw about the universe from this statement?

Answer 1

Actually, matter can be converted to energy, and the conversion factor is Einstein's special relativity,   Energy = mass X speed of light X speed of light.  The conversion can also go from energy to matter using the same equation.  It is the sum of the matter and energy that is conserved in a laboratory setting.

The basis of this conservation is that the laws of mechanics are not dependent on time.  That is, a lab experiment in mechanics is repeatable if all other factors are constant and the experiment is conducted at different times.  

However, on a cosmological scale, the universe is expanding, so that cosmological observations do change with time.  Therefore, the conservation of matter and energy does not hold true for experiments on the cosmological scale.

Answer 2

um: hard to explain:

if fire burns then usualy little kids will say that the fire is burning away the wood, or fuel. This is not true because they dont know the law of conservation of matter. When fire burns the wood is chemicaly changed into other substances that we usualy dont notice. these are things like ash and air molecules. When fire burns most of the wood changes into a gas and floats away: so its not destroyed, its changed and disposed of. So, separate atoms and molecules cant be destroyed, only changed or rearanged

Answer 3

Your initial "if" statement is incorrect.

Matter can be destroyed - it can be converted to energy (as in nuclear fusion or fission).

Matter can be created - get enough energy together in a small enough volume and you can create matter (as occurred in the few minutes after the Big Bang).

Its energy that can't be created or destroyed, but it can change form.  Matter is a very concentrated form of energy, so a small amount of matter can become a large amount of energy (such as in nuclear fusion and fission).

Answer 4

that everything is rearranged. Wheither it is from one state to another. Ex. solid to liquid to gas

Answer 5

Every single atom that you are made of has been around since the earth has been around.  Everything that is required to make your possible future child is all around you already.  Pretty cool.