When you cook an egg, do you think a chemical change occurs? why or why not?
148116
Yes, because it changes at a molecular level.
922983
lol chem... anyway a physical change is one that only effects apperence such as a paper ripping or adding paint to a wall. a chemical change changes what something is compleatly like burning paper changes it into ash
761935
when in a chemical reaction
751030
As an egg gets older, it produces hydrogen sulfide, a gas. The gas moves to one end of the egg. To see how old an egg is, place it in a pan of water. If it floats, don't use it. If it stays on the bottom but points up, it is getting old, but I still use them. If it stays on the bottom, flat, it is fresh.\n\nYou can tell if an egg is hard-boiled by spinning it. If it spins easily and fast, it is hard boiled!\n\nHope this helps!
208346
Strictly speaking, a chemical change occurs when the bonds between atoms are either made or broken (often both).  Bonds can be either covalent (electrons are shared), ionic (one or more electrons are given up by one or more atoms and given to another atom or atoms), or metallic.  Burning something is a chemical reaction.
663469
A physical change is reversible, a chemical change is not.  Using that information you should easily be able to figure out your question.\nBut yes, it is\na)chemical\nb)physical\nc)chemical\nd)physical
620539
a chemical change changes the structure of a substance and a physical change doesn't.\n  chemical change:\n  when the gas leaves the water H2CO3= H2O + CO2\n  melting of a metal\n  physical changes:\n  boiling water\n  cutting a piece of metal in half
704076
Microwaved a whole raw egg for about ten minutes, opened the door to inspect it's progreess and had it explode all over my face.\n\n This may also qualify as the stupidest thing that's ever happened to me.
545782
Because like chemistry, everything you cook has its own recipe with a different outcome.  You mix your liquids, powders and come out with solids.  Even cooking can be your own experiment.  Each ingredient reacts with others differently(baking soda, baking powder, yeast)
97497
There are temperature changes is most reactions becuase there is heat generated, known as the heat of reaction.
290614
chemical reaction\n\nall substance give off some heat during change\n\nlook up kinetics on the web
896471
there is an science project that you put a whole uncooked egg in  vinegar and see how long it take for the vinegar to break the eggs shell down and make the shell soft and you just monitor the progress it's very cool cause you would never think that an eggs shell could turn soft you can also to give it more depth by trying other liquids and compare them
335557
I believe u change the heat energy\n\nNo\n\nYes\n\nYes, I think\n\n?
323999
Physical changes only change the appearance of the substance eg - water turns to ice or turns to water vapor is a physical change. The atoms are not rearranged. This kind of reaction is easy to reverse.\nChemical changes actually changes the chemical substance, and its characteristics and require much energy to occur. eg - hydrogen and oxygen combine to form water (H2O). these reactions are very hard to reverse. The atoms are rearranged. \nMarina.
899050
It does NOT occur spontaneously.  If it did, you wouldn't need a pilot light in your gas stove of heater!  Combustion takes place by the mechanism of free radicals.  And CH4 won't form any at room temperature.  Once some free radicals are created (by high temp.) the reaction is self-sustaining.\n\nComment on the mention of Pt below:  Yes they DO still do that; but they use either Pt mesh or wire.  That's the way pilotless gas burners work.
1176558
Probably you are having a reaction to some chemical or preservative used in making it.
701033
all eggs are laid even if they are powdered the just have been dehydrated.  also shouldn't this go in the food section