In a nutshell, a chemical change produces a new substance, while a physical change does not. A material may change shapes or forms while undergoing a physical change, but no chemical reactions occur and no new compounds are produced. And for an explanation on how to see the difference Look for an indication that a chemical change occurred. Chemical reactions release or absorb heat or other energy or may produce a gas, odor, color or sound. If you don't see any of these indications, a physical change likely occurred. Be aware a physical change may produce a dramatic change in the appearance of a substance. This doesn't mean a chemical reaction occurred.
Answer:
A) It is the distance that light can travel in one year
Explanation:
A lightyear is a measure of distance used for all light in space.
Answer:
c. In the bonds between the atoms
Explanation:
The energy in a sucrose molecule is stored in the bonds between the atoms.
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