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Boiling rate is different from case to case depend on the heat rate. More the heat rate, the water will boil more violently and that indicate higher evaporation rate. Please conduct experiment with care under adult supervision. The factors involved in Rate of Evaporation:

1- Thermal unit

2- Area of container in which water is boiled

3- Amount of water to be boiled

4-Purity of Water

Location could be the fifth factor,at sea level,top of a mountain,in high elevated area, finally,substantial pressure on water container.I call it environmental factor,like quality of water container as well(may be the sixth factor)

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In an activity20 grams of salt are dissolved in 70 grams of water. The water is then heated on a hot plate. When the water evaporates completelyhow much salt will be left?

If the water was pure and had no salt already mixed in it then the same 20 grams of salt would be left, as salt doesn't evaporates on the temperature at which water does evaporates.


How much salt is left after the water has evaporated.?

Salt does not evaporate with water, so all the salt that was initially in the water remains behind once the water has evaporated. This is because salt has a much higher boiling point than water and remains in solid form when the water evaporates.


Why does salt not evaporate with water?

Salt does not evaporate with water because it has a much higher boiling point than water. When water evaporates, it leaves behind the salt, which remains solid. Salt can be dissolved in water, but it does not evaporate along with the water molecules.


How much space would 18mL of water take up if it evaporated?

When water evaporates, it changes from a liquid to a gas, increasing its volume significantly. The volume of 18mL of water would expand as it evaporates due to the conversion of liquid water molecules to water vapor molecules. The exact amount of space the 18mL of water would occupy when it evaporates depends on various factors such as temperature, pressure, and humidity.


Why don't fish live very long in water that has been boiled and brought back to room temperature?

Fish can't survive in boiled water because they are cold-blooded animals. Their bodies adapt on the temperature of their environments. Another reason is, the temperature of boiled water is beyond the normal temperature of their environment.a2. Ahem, I think the Q concerned boiled water, not boiling water. The outcome is the same as above, but in this case, because even if the water was cooled again, it would be quite deficient in dissolved air. From a fishes point of view that is.