What characteristic does a machine need to have to be able to explore places like under the ice on Europa? A. It must be able to explore on its own.
B. It must be able to take pictures.
C. It must be able to collect samples.
D. It must be able to emit light.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

c. orbital shape i hope this is correct