Two identical electric kettles are switched on at the same time. A contains 1 litre of water,and kettle B contains 0.5 litre of water.in both kettles the temperature of water is 20 degree C.the water in kettle A takes longer to reach boiling point than the water in kettle B.why??
2006-10-04 06:46:32 · 3 answers · asked by aleX 1 in Science & Mathematics ➔ Chemistry
The rate rise in temperature is directly proportional to the mass of the water. The rate of energy supply is the same in both cases but twice the water takes twice the time to heat up.
2006-10-04 06:49:48 · answer #1 · answered by andyoptic 4 · 3⤊ 0⤋
This is so obviously because you have more volume of water in container A than in container B. When your system has a bigger volume it will require more energy (which is heat) to increase it's disorder because you have more water molecules absorbing it. Boiling involves the escape of your surface molecules from your solution, and in order for these molecules to escape your solution they have to have enough kinetic energy lo leave the existing system.FYI, boiling will only happens when the vapor pressure of your solution equals to that of the external environment (which is the atmospheric pressure or the pressure inside of a closed kettle) and in order for this to happen high temperature is required.
2006-10-04 14:05:30 · answer #2 · answered by chico4 1 · 0⤊ 0⤋
cant believe u type that well. are u messing with us?
2006-10-04 14:09:02 · answer #3 · answered by enord 5 · 0⤊ 0⤋