Which of the following options describe an enthalpy diagram correctly? Select all that apply
a- Enthalpy, H, increase up the y-axis
b- The arrow in the enthalpy diagram points from reactants to products
c- The direction of the arrow in an enthalpy diagram indicates whether a reaction is exothermic or endothermic
d- In an endothermic reaction, the reactants will be at the bottom of the enthalpy diagram