washing plates,warm water helps to remove grease more easily why.why sugar dissolve in hotwater than in cold?
922727
The reason is that heat causes molecules to move faster - the cold slows them down. Think of it like molasses when it is cold it is really thick and flows slowly - but if you heat it up it thins out and would flow more easily. When molecules are heated they are easier to manipulate. I hope this helped.
184934
I would only add that some hydrophobic dirt (e.g., solid grease) is not removed or detached by detergent action alone; scrubbing is needed as well. The main power of detergents in such cases is that they keep the grease from reattaching, or floating on the surface threatening to reattach, by keeping the grease particles in suspension. Frequently people put detergent and water in a greasy pot, hoping all will be clean in the morning. This seldom happens.
167637
Although it might seem convenient to make up formula from warm tap water, this is not safe according to the U.S. Environmental Protection Agency (EPA). Compared with cold tap water, warm water is far more likely to carry lead that has leached out from the plumbing. Lead levels in drinking water tend to be highest in homes built before 1930 with lead pipes; homes less than 5 years old with copper pipes and lead solder, and homes with brass faucets or fittings.
112251
Cold liquids dissolve gases better than warm ones. When you heat the bottle the temp. of the drink drops and the dissolved gases escape. But stay inside the bottle. Further heating cuaseas them to expand resulting in greater kinetic energy of molecules resulting in the bursting of the botle.
168651
At a higher temperature, the water molecules are further apart, thus creating more space for the molecules of sugar.  Consider two identical bottles: (A) is filled with sand and (B) is filled with gravel.  If you pour water in each bottle, which one will take more water?  Obviously (B) because there is more space available.
1067124
Actually it is the soap in combination with the warm water with the friction that makes you clean.  At least that is what they taught me at work in our little class on how to wash your hands.
833125
Hot water opens your pores and makes them larger/more noticeable. Hot water is good for washing your face because it opens them up and makes it easier to get oil and dirt out. Cold water closes the pores and makes them smaller/less noticeable. It's good for rinsing your face after you wash it.
465989
Sugar will dissolve in cold beverages regardless of what else is going on.  However, in both Kool-Aid and tea, it is a fact that the sugar dissolves more easily in warmer water, and you can get more sugar to dissolve in warmer water than you can in cold water.  It wouldn't be true to say that sugar can't dissolve in cold water in a tea mix.  Kool-Aid or tea mix, it doesn't matter because neither will have a real influence on the solublily of sugar.\n\nYour observation, then, is probably just wrong.
969629
Probably to determine the amount of dissolved solids (commonly called "Total Dissolved Solids" or "TDS") in it.  Dissolved solids are anything dissolved in the water that will leave a residue when evaporating it to dryness.  \n\nIn this case it will consist primarily of sugar, except for the diet, which will have no sugar.\n\nMore about TDS:  The reason you can detect the density difference between pure water and sugar water, is that most solids will have a higher density than water.  Therefore, when they are mixed or dissolved in the water, they will increase the density.
1118061
Warm water increases blood flow, and if you prefer cold showers the cold water is stimulating. Also the smell of the soap no matter how light is somewhat therapeutic. There's also the feeling of washing away problems,stress, anger, and all negative things down the drain.
1057215
Because it's easier to clean up, the hot water makes the veins rise to the surface of your skin and makes the blood flow faster AND the hot water relaxes you until you pass out from the blood loss.
179327
they dont have large enough hydrophobic regions to absorb oils and greases into solution, or create micelles. the best soaps are Sodium fatty acids... they have an ionic side, which helps them be soluble in water, and a long organic chain to create a hydrophobic region to make it easier to form micelles in water to pick up grease.
115994
Salt occurs as (Na+Cl-) \nThe water molecules come between the atoms of salt , and thus breaks the ionic bonding b/w Na+ and Cl-.Na+ is attracted to the lone pair of oxygen atom of the water molecule and Cl-to the H atom of water molecule , thus hydrolysis and solvation of salt occurs, which makes the salt to dissolve fast whereas in sugars, the molecules are quite big and moreover sugar has a planar geometry , and contains bonds like -C-H, -C-OH-, -C-O-C-, these breaking of these bonds require more energy and moreover -C- is non-polar, thus increasing the no. of C atoms will make a compound to dissolve less in water. Sugar has 6 Carbon atoms.\nThus to dissolve sugar , we need stirring.
745215
The answer is yes. And I bet you want more of an explanation, which gets a little tricky. It would seem evident that cold water would freeze faster than warm water. But there have been raging debates in scientific circles over whether that's true or false. The fact is a lot of different factors contribute to how fast water freezes, including its beginning temperature.\n    Physicists writing in the journal Scientific American have waded into the fray and have probably come the closest to a satisfactory answer. Quoting Paul G. Hewitt in the book Conceptual Physics, the Scientific American writers believe that hot water will freeze faster than lukewarm water, but not faster than cold water. (Except under certain circumstances.)\n    According to Scientific American, water at 90° C will freeze before water that is 60° C. Below 60° C, however, there is a switch and the cooler water will freeze faster. For example, 30° C water will freeze faster than 60° C water. It has to do with the water evaporation of the hot water immersed in a cold environment. The rate of cooling by evaporation is way higher for hot water than for the cooling of lukewarm water.\n    Now, for those certain circumstances. When you put a pan of cold water and a pan of hot water in a freezer (both pans have equal masses of water), the hot water experiences this rapid evaporation AND freezing from below, which cools water on the bottom of the pan. Because the surface water is already warm or hot, the water at the bottom just sits there instead of rising, getting colder and colder. The water at the top experiences evaporation. The combined effect could make the hot water freeze faster than the cold water.
910767
Water.  Alcohol absorbs heat quickly but doesn't store it well.
241754
Thermal intertia.  It works the other way too, cold water boils quicker than hot water.  The reason is when hot water is placed into the ice cube tray it immediately begins cooling.  Then when you put it into the freezer it continues to accelerate more and more quickly to the low temp desired.  Cold water would begin warming as soon as it gets put into the tray and then you have to cool it back down (opposite direction heating takes more energy)
1127009
This would depend on the temperature of the water.  As temperature increases the amount of sugar soluble in the water increases.  Take a look at this link: http://www.shorstmeyer.com/msj/geo130/water/water.html\nfor a graph showing the solubility of sucrose in water over a temperature range of 0 to 100 degrees C.  The range is just under 200g/100ml water at 0 degrees up to 500g/100 ml water at 100 degrees.