Answer: C
Explanation:
In endothermic reactions, enthalpy is positive, and in exothermic reactions, enthalpy is negative, So, if enthalpy is positive, then it is an endothermic reaction, and hence is required for the reaction to occur.
Explanation:
Evirmental disruption because if they had stability then they would not need change. The other two don't make sense....I hope this helps
If this is scientific notation, then the answer is 22290000, or 2.229x10^7
Protons are positively charged and are found inside the nucleus of an atom