No. It will, however, create a slurry.
Cold water
no
flour
To dissolve flour you put HOT water and baking soda and leave it for about an hour and a half
No. Flour does not dissolve with water. So they do not form a solution.
Flour to cold water will just float on top, hot water to flour will cook the flour.
To dissolve flour in a liquid you will want to use a wisk. This will break apart the little bubbles and balls that flour forms when it is placed with a liquid like water or eggs.
Substances that dissolve in water are generally crystalline constructs of molecules that are pulled apart by the strong hydrogen bonding forces held by water. Flour is made from ground wheat, and as such cannot dissolve, as such.
Flour is made up of proteins and starches that do not easily dissolve in water. When flour is mixed with water, the proteins and starches form a sticky mixture due to the hydration of the proteins and the swelling of starch granules, rather than dissolving like a soluble substance.
Yes. Cold water does disslove.
Sugar will dissolve in water but flour won't. Mix both in water, strain out the flour. Evaporate the water and what is left is sugar.
Your question is a little vague. Are you using the flour as a thickening agent? If so just dissolve 4-5 teaspoons of cornstarch into cold water and add it slowly to your sauce, stiring constantly until you get the desired thickness. You can always dissolve more into cold water and add as needed. Corn starch is much more effective thickener than flour, so usually much less is needed.