physical science : Which of the following would require the greatest number of calories?
a. heating 1 g of water from 10°C to 80°C
b. heating 10 g of water from 10°C to 40°C
c. heating 100 g of water from 10°C to 20°C
d. heating 1000 g of water from 10°C to 12°C

Question

physical science :   Which of the following would require the greatest number of calories?
    a. heating 1 g of water from 10°C to 80°C
    b. heating 10 g of water from 10°C to 40°C
    c. heating 100 g of water from 10°C to 20°C
    d. heating 1000 g of water from 10°C to 12°C

mertsj · Answer

1 calorie is the energy needed to raise the temperature of 1 gram of water through 1 celsius degree.  So...a) requires 1(80-10)=70  b) requires 10(40-10)=300 c) requires 100(20-10) = 1000 d) requires 1000(12-10)=2000.  So choose d