Answer:
B) a substance's color and odor changed Explanation: A signal that a chemical change has occurred is when its odor (its smell) or its appearance has changed.
Answer:
A normal atom has a neutral charge. When you are missing electrons it has a positive charge. When you have extra electron, you have a negative charge. I am not sure what the answer to your second question is, sorry.
Explanation:
Answer:
3 hydrogen ions
Explanation:
phosphate ion is (PO4)^-3. It has charge -3.
Hydrogen ion has charge +1.
So, we need 3 hydrogen ions,
3H^(+1) + PO4(-3) ---> H3PO4
Educated Guess Here!
Since Br-80 does not exist, maybe that means Br-79 or Br-81 have very unequal abundances. For example, Br-79 may have 75% abundance whereas Br-81 may have 25% abundance.
