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i am doing a lab for chemistry and the question is "cooking involves both physical and chemical changes. give examples that support this statement." I can't think of anything that is a chemical change...i know its probably really easyy...but i really need help!

2006-09-24 16:25:19 · 14 answers · asked by Quechyyy 2 in Science & Mathematics Chemistry

14 answers

In short, Labile and Heat-Labile compounds, such as a type of food poisoning.

2006-09-24 16:35:36 · answer #1 · answered by smiley0_1_1999 5 · 0 0

Try to think of things where there is a color change. frying an egg, cooking meat or fish. Look at the difference between canned and frozen peas. The heat changed the chlorophyll. the combination of sugars and protein in the crust is what gives the brown color. Cooking a cake , the heat makes the baking powder release the gas carbon dioxide, a gas to rise. The thickening of a starch mixture.

2006-09-25 20:53:35 · answer #2 · answered by science teacher 7 · 0 0

A chemical change that might be overlooked is the oxidation of methane gas (CH4) into carbon dioxide and water, with the release of heat...in the burning of gas to form the heat to cook. Other chemical reactions are the release of CO2 with water from baking powder when used in batter instead of yeast.

2006-09-24 23:32:42 · answer #3 · answered by David A 5 · 0 0

Frying an egg qualifies. The albumen protein molecules are denatured and cross-linked to get the cooked state of the egg. Another example is baking cookies using soda. The soda decomposes, yielding carbon dioxide to give a light texture to the cookies.

2006-09-24 23:30:33 · answer #4 · answered by Anonymous · 0 0

The meillard reaction is particularly important in cooking. That reaction is reponsible for the browning of foods that are broiled and turn brown. It gives meat it's broiled coomplex tastes. Essentially the heat causes sugars to chemically react with proteins.
Dan.

2006-09-24 23:38:36 · answer #5 · answered by Dan S 6 · 0 0

A chemical change is adding two substances together to get a totally new product. Just think of maybe baking a cake, adding a few ingredients together to get a new substance. Think of anything you eat.

What grade are you in?

2006-09-24 23:33:07 · answer #6 · answered by Spastic girl! 2 · 0 0

After you bake cookies try to pull out the flour. You can't becuse the cookie has changed at a chemical level.

2006-09-24 23:29:47 · answer #7 · answered by Anonymous · 0 0

Anytime you bake a cake or cookies, you get a chemical change, as well as a physical change.

2006-09-24 23:32:43 · answer #8 · answered by cool_breeze_2444 6 · 0 0

what is it with all the homework questions on here? why don't you all just use the encyclopedia and other reference on line? SUGAR....when you cook sugar by itself over a fire stirring it will turn to carbon...that involves both a physical and chemical change. i did this when i was in grade school..back in the 1960's...

2006-09-24 23:36:11 · answer #9 · answered by Cheryl E 4 · 0 1

You can take example of cooking of a cake where we use baking soda(NaHCO3) which is converted into CO2 and provide puffiness or softness to the cake.

2006-09-24 23:33:16 · answer #10 · answered by Anonymous · 0 0

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