Answer:
b
Explanation:
b/c proton + neutron=mass number and
mass number - proton= neutron
Answer:
because no chemical change is happening
Explanation:
It is more likely 9. pH 4 is acidic and pH 9 is basic, and as the pH of a substance gets closer to 0 or 14, the substance becomes more corrosive or reactive. As 4 is closer to 0 than 9 is to 14, there is a much higher chance the solution has a pH of 9, because pH 4 is less neutral and therefore more corrosive/reactive than pH 9.
I agree with the statement that the other person has made
