Junior chemistry-speeding up chemical reactions with heat.

Heat is used in cooking to speed up the many chemical reactions that result in a delicious meal. All matter consists of atoms joined together to form different substances. The point at which these atoms join together is known as a chemical bond. During a chemical reaction chemical bonds are broken and then reformed to make new products. We often use heat to break chemical bonds and get the reaction going.

The animation on the right shows how heat is used to speed up the particles and break them apart. The atoms then rejoin to form a new product.

The animation on the right shows the formation of water from hydrogen and oxygen gas. Hydrogen gas particles appear blue while oxygen gas particles appear black in the animation.

Using heat to speed up reactions in the kitchen.
Click to refresh yourself with particle theory. Chemical reactions take place all around us. Some are very slow while others occur spontaneously. We often use heat to speed the chemical reactions that occur slowly. The burning of natural gas in the kitchen is a reaction that occurs spontaneously and gives off a great deal of heat
Heat is used in cooking to speed up the many chemical reactions that result in a delicious meal. All matter consists of atoms joined together to form different substances. The point at which these atoms join together is known as a chemical bond. During a chemical reaction chemical bonds are broken and then reformed to make new products. We often use heat to break chemical bonds and get the reaction going. The animation on the right shows how heat is used to speed up the particles and break them apart. The atoms then rejoin to form a new product. The animation on the right shows the formation of water from hydrogen and oxygen gas. Hydrogen gas particles appear blue while oxygen gas particles appear black in the animation.	Normally the particles above travel too slowly to react together. With the increase in heat the particles travel faster, colliding with greater force. Chemical bonds are broken and then reformed between different atoms, creating new substances.
Heat helps to break chemical bonds in the protein forming the egg albumin. The result is the hard, white product shown on the right.
Consider the video on the right. It shows the rate of a reaction producing carbon dioxide gas when hot water is used. Compare it with the rate of the same reaction but when cold water is added. The video is shown below.
This video shows a chemical reaction producing carbon dioxide gas when cold water is used. Exactly the same amount of powder and water was used as in the hot water test shown in the video above. What do you notice about the speed of the reactions?
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