Why does it take more energy to increase the temperature of 100 grams of liquid water by one degree Celsius than it does 100 grams of copper metal?

The answer to your question is below

Explanation:

The specific heat is a physical property equal to the amount of heat necessary to increase the temperature of 1 gram of a substance by one degree celsius.

The lower the specific heat, the lower the amount of heat to increase the temperature 1°C, the higher the specific heat, the higher the amount of heat necessary to increase the temperature by 1°C.

The specific heat of copper is 0.093 cal/g°C

The specific heat of water is 1 cal/g°C.

That is why is necessary more heat to warm water.