Mendeleev was not the first scientist to attempt to organize the elements into a table, but how was his periodic table unique?

The excretory system,need answers for all: )

Choose an equation that represents an enzyme-catalyzed reaction. (a) enzyme + substrate → enzyme-substrate complex (b) enzyme + substrate ←−→ enzyme + products (c) enzyme + substrate ←−→ enzyme-substrate complex → enzyme + products (d) enzyme + substrate ←−→ enzyme-substrate complex → enzyme-substrate complex + products

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.