PURE
Yes because it is nutrition for the flower. Florists offer food with sugar and other things to help them last longer. Sugar water does not work for regular plants though. It will clog their roots and stop as much water being absorbed.
As soon as possible while under water cut the ends off (the longer its been since they were cut the more you should remove). add to the water some suger and a drop of chlorine bleach to prevent bacteria growth.
a flower is a mixture
You are making flower soup, in a sense, when you place flowers in water. Flower stems are full of organic chemicals that can be eaten by bacteria or fungi, that can decay, that can make water cloudy, etc.
I think a greyhound, but I'm not 100% sure.
The boiling point of pure water is lower than the boiling point of a water-salt solution, so it takes takes longer to heat the water-salt solution to its boiling point.
Pure, White flower
Yes. The boiling point of salt water is higher than the boiling point of pure water.
Pure water is pure because it is pure... and because it is pure, it is pure... Got it... What sought of question is that?
Pure water. Anything you add to the water will depress the freezing point thus making it take longer to freeze.
Many people in the world do not have access to clean water, and virtually no drinking water is absolutely "pure." But cleaner water usually results in fewer health problems. Humans can live longer without food than they can without water, but water itself has no nutritive value.
Salt, if you put it on ice, melts the ice. So that probably what is causing it not to freeze as fast.