100 g of water and 100g of metal sample are heated from 25 to 75. which substance requires more thermal energy to reach 75c

For this question, it is important to understand the term specific heat in order to determine which requires more thermal energy. It is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The material which has a larger value of the specific heat is the substance that requires more thermal energy.

Nonmetals usually react by gaining electrons