One kilocalorie is the amount of heat needed to raise the temperature of how many kilograms of water by how many degrees Celsius?

One kilocalorie is the amount of heat needed to raise the temperature of how many kilograms of water by how many degrees Celsius?

• A. 2 kilograms by 1 degree Celsius
• B. 1 kilogram by 2 degrees Celsius
• C. 3 kilograms by 1 degree Celsius
• D. 1 kilogram by 1 degree Celsius

Answer: (D)

One kilocalorie is defined as the amount of heat required to raise the temperature of 1 kilogram of water by 1 degree Celsius. This follows from the base idea that 1 calorie raises 1 gram of water by 1°C; 1000 grams (1 kg) would then require 1000 calories, which is 1 kilocalorie. So the best answer is heating 1 kilogram of water by 1°C. The other options would need more or less heat (e.g., 2 kg by 1°C would need 2 kcal; 1 kg by 2°C would need 2 kcal; 3 kg by 1°C would need 3 kcal).

One kilocalorie is defined as the amount of heat required to raise the temperature of 1 kilogram of water by 1 degree Celsius. This follows from the base idea that 1 calorie raises 1 gram of water by 1°C; 1000 grams (1 kg) would then require 1000 calories, which is 1 kilocalorie. So the best answer is heating 1 kilogram of water by 1°C. The other options would need more or less heat (e.g., 2 kg by 1°C would need 2 kcal; 1 kg by 2°C would need 2 kcal; 3 kg by 1°C would need 3 kcal).