Two samples of gold that have different temperatures are placed in contact with one another. heat will flow spontaneously from a sample of gold at 60°c to a sample of gold that has a temperature of
(1) 50°c (3) 70°c
(2) 60°c (4) 80°c

Explanation:

The second law f thermodynamics tells us that naturally, heat will flow from a hotter object to a colder object until the bodies are at the same temperature. So heat will spontaneously flow from gold at 60 degrees Celsius to a body that is colder than it which on the list of possible answers.

i just learnt this recently but i need to look through my notes again

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.