Im pretty sure it would be d.
Answer:Um... I think 5000 i am not really sure
Explanation: I Dont Really Know
Endothermic reactions and Exothermic reaction are never the same.
They are both different.
Definitions
<span><span>Endothermic:- reactions that take in energy. For example:- electrolysis, thermal decomposition and the reaction between ethanic acid and sodium carbonate.
</span><span>Exothermic:- reactions that transfer energy to the surroundings. For example:- burning, neutralisation and the reaction between water and calcium oxide.</span></span>
Answer:
2H2 + O2 -----> 2H2O
Not sure about the second question though.
