Ions have an extra or lost an electron. Isotopes have different numbers of neutrons.
Answer: Chemical composition modification (or, physical signal would be color).
Answer:
1. B
2.C
3.D
4.Sorry don't this one :(
5.A
Explanation:
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To find the mass of glucose, you must multiply the atomic weight of each of the elements in the molecule by the subscripts in the formula:



Then you add all of them together:

Therefore, the molar weight of glucose is 180.15 grams.