Acids and Bases

Bernard and Thomas

What Is An Acid?

• Acids are a group of chemical compounds.

• Some acids are dangerous and can burn your skin or corrode metal.

• Some acids are harmless and are safe to taste.

Examples of Acids

• Battery acid

• Vinegar

• Citric acid (lemons, grapefruit, oranges)

• Lactic acid (sour milk, yogurt, cottage cheese)

What Can Acids Do?

• Acids can corrode metal.

• Acids can turn blue litmus to red.

• Acids can change the color of some vegetable dyes.

What Is A Base?

• A base is slippery or soapy in texture.

• Some bases are dangerous and can burn your skin.

• Some bases are harmless.

• Some bases, called Alkalis, can be dissolved in water.

Examples of Bases

• Chalk

• Baking Soda

• Milk

What Is An Indicator?

• Indicators are substances that change color depending on whether they are in an acidic or basic solution.

• Indicators are often made from plants.

What Do Indicators Do?

• Indicators change colors depending on how acidic or basic a solution is.

• Very acidic = red• Neutral = yellow• Very basic = blue

pH Paper

• pH paper, or litmus paper, is a strip of paper that you dip into science samples.

• It will show you if the sample is an acid, neutral, or a base.

pH Scale

• Scientists use a pH scale to see if the chemical is an acid or a base.

• The pH has 14 colors. 1-6 are acids, 7 is a neutral, 8-14 are bases.

What Is A Chemical Reaction?

• A chemical reaction occurs when atoms interact, exchange or share electrons, forming new chemicals.

Example Of A Chemical Reaction

• A chemical reaction occurs when you mix vinegar and baking soda. When you add those two together you make carbon dioxide gas.

• As you can see in this picture the reaction makes carbon dioxide which goes into the balloon and blows it up.

Chemical Quiz

• Test your knowledge on Chemical Reactions.

• Click on chemical reactions to take quiz.

Bibliography

• http://www.chem4kids.com/files/react_acidbase.html• http://www.chemtutor.com• http://www.teachnet.com• http://www.funsci.com• http://www.biochem.northwestern.edu• http://www.madsci.org/