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Transcript of Cooking Chemistry
Properties of liquid nitrogen
It is extremely cold. At atmospheric pressure, liquid nitrogen boils at -320°F / -196° C.
Very small amounts of liquid vaporize into large amounts of gas. One liter of liquid nitrogen becomes 24.6 ft3/0.7 m3 of gas.
How does liquid nitrogen super cool?
What are the results of supercooling?
the liquid becomes a gas
What is the chemical reaction in glow sticks? What kind of reaction is it?
In glowsticks different compounds combine and cause a release of energy, which is let off as light. This is called chemiluminesence, because is is using chemicals
to create light
What is the chemical formula of the flambe gel?
calcium acetate ethenol
What kind of reaction is occurring?
Combustion- a chemical reaction that produces heat
What other substances are added? What are their chemical formulae?
Why do they flame different colours?
Different chemicals give off different amount and types of light, energy is added to them and electrons change shells
What is thermite?
Noun:A mixture of finely powdered aluminum and iron oxide that produces a very high temperature on combustion
What is its chemical formula?
Fe2O3 + 2 Al
How does it work?
Thermite is a mixture of iron oxide and aluminum. Aluminum is an extremely reactive metal. When burned the mixture creates aluminum oxide and iron and a ton of heat! The reaction is extremely vigorous becuase of the properties of the aluminum. Not sure whether it still is but at one time thermite was used as a solid rocket fuel.
I strongly suggest that you not experiment with this stuff even if you do find a recipe for it's creation.
Write the chemical reaction that takes place.
The goldschmidt reaction-highly exothermic release of energy that results in an explosion
Ingredients Edit and Save
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Original recipe makes 1 - 9x13 inch or 2 - 9 inch round pans Change Servings
1 3/4 cups all-purpose flour
2 cups white sugar
3/4 cup unsweetened cocoa powder
2 teaspoons baking soda
1 teaspoon baking powder
1 teaspoon salt
1 cup strong brewed coffee
1 cup buttermilk
1/2 cup vegetable oil
1 teaspoon vanilla extract
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1.Preheat oven to 350 degrees F (175 degrees C). Grease and flour two 9 inch round cake pans or one 9x13 inch pan.
2.In large bowl combine flour, sugar, cocoa, baking soda, baking powder and salt. Make a well in the center.
3.Add eggs, coffee, buttermilk, oil and vanilla. Beat for 2 minutes on medium speed. Batter will be thin. Pour into prepared pans.
4.Bake at 350 degrees F (175 degrees C) for 30 to 40 minutes, or until toothpick inserted into center of cake comes out clean. Cool for 10 minutes, then remove from pans and finish cooling on a wire rack. Fill and frost as desired.
• Baking Soda
•Baking soda is also called sodium bicarbonate, and its chemical formula is 2NaHCO3. It is a leavening agent that causes a cake to rise by producing bubbles of carbon dioxide, or CO2, as well as the byproducts of water (H2O) and sodium carbonate (Na2CO3). This occurs according to the following formula: 2NaHCO3 = Na2CO3 + H20 + CO2. However, since sodium carbonate has a high pH, this can cause the cake to become bitter unless it is balanced with an acid.
•Baking powder is baking soda (NaHCO3) that has already been neutralized with the addition of an acid (H+). Baking soda produces carbon dioxide as well as water (H20) and sodium (Na+) according to the following equation: NaHCO3 + H+ = Na+ + H2O + CO2. Baking powder produces more CO2 than baking soda, which means more bubbles in the cake mix and a softer finished product.
•Egg yolks are an emulsifier that helps the oil-based and water-based components of the cake mix together. When eggs are cooked, the protein molecules become uncurled when exposed to heat and create new molecular bonds with other nearby protein molecules. When the egg is completely cooked, it helps form a protein network that gives the cake structure.
Read more: Chemical Reactions Involved in Baking a Cake | eHow.com http://www.ehow.com/facts_7173041_chemical-reactions-involved-baking-cake.html#ixzz2Aq9XujUj What is the chemical formula of the flambe gel? Calcium acetate ethanol. What kind of reaction is occuring? Combustion- a chemical reaction that produces heat. What other substances are added? Strontium (Sr)
Copper (Cu) Why do they flame different colours? Different chemicals give off different amounts energy as they are burned, resulting in different types of light. as What is thermite? Thermite is a mixture of finely powdered aluminum and iron oxide. How does it work? Aluminum is an extremely reactive metal. When burned, thermite turns into aluminum oxide and iron and a ton of heat. The reaction is so vigorous because of the properties of Aluminum. What is its chemical formula? Fe2 O3 + 2Al What is the chemical reaction that takes place? The Goldschmidt reaction- A highly exothermic release of energy that results in an explosion. Sources
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