What happens to the weight of water during heating?
Nothing. In a closed system you cannot create or destroy mass by heating. Picture taking a sealed cansiter of water and heating it on the stove. The water inside would get hotter and the pressure would increase and it would all eventually become steam. But since no water has escaped and none has been added the amount of mass inside the cansiter hasn't changed so it will still weigh the same. The only time it would change is if you had an open system, like an uncovered pot on the stove where the steam is allowed to escape. Since steam is exiting the system the mass is decreased and the weight is decreased.
An integrated system for both space and water heating. Heating is accomplished in a condensing heating module having a small hot water storage reservoir to reduce burner cycling during periods of low demand. The space heating system includes a fluid flow loop with a fluid circulating pump for circulating a heat transfer fluid in the loop from the heating module to a remote space heating heat exchanger. The heating module can also supply hot water…
During the cooling of the fired crucible water condensed on The Crucible wall before its mass measurement Will the reported percent water in the hydrated salt be reported too high or too low?
Why is the position of The Crucible lid critical to the dehydration of the salt during the heating process?
Heat is simply molecular energy, or, the speed molecules are moving. When heating water, energy is added to the particles of water, and so they move and vibrate faster, thus heating up, until the particles break away from each others electromagnetic force, and fly off at their own will, creating steam and water-vapour.
Take a known weight of the sodium carbonate, heat it to above 100ºC to drive off the water, and keep heating until a constant weight is obtained. The difference between initial weight and final weight is the mass of water attached. Convert this to moles and then to molecules and relate this to 1 formula unit of Na2CO3.
If you are standing on a scale holding 1 pound of water and then drink the 1 pound of water does your weight change?
Your weight, or the weight registered on the scale? Your weight will increase by one pound, but the weight registered on the scale will remain the same. If you stand on the scale, note your weight, pick up the water (using a very light, perhaps paper cup), note the weight after you are holding the water, and then drink, and put down the cup, you will see what happens.