In which sample of water do the molecules have the highest average kinetic energy 1)20. ml at 100.°c 2)40. ml at 80. °c 3)60. ml at 60.° c 4)80. ml at 40.° c

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Energy defines the different "states" of matter. in no more than 3 sentences, describe the amount of kinetic energy that each of the 3 states of matter possesses and relate that to the atom/molecular motion of each "state".

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?