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1) What are Acids and Bases?

DO NOW : Have you ever had heartburn ? Describe what it feels like. What do you think causes it?. Day 10 Aim : What do we mean by acid and bases; and how is the strength of acids and bases measured?. 1) What are Acids and Bases?.

amelia-shelton
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1) What are Acids and Bases?

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  1. DO NOW:Have you ever had heartburn? Describe what it feels like. What do you think causes it?

  2. Day 10Aim: What do we mean by acid and bases; and how is the strength of acids and bases measured?

  3. 1) What are Acids and Bases? • Scientifically speaking, acids are substances that release a hydrogen ion into water. • While bases are substances that release OH into water. Don’t write!!

  4. What are Acids and Bases? • What you need to know is that: • Acids and bases come in different strengths • The strength of an acid or base is measured on something called an pH scale. • The strength of an acid or base can affect other molecules (such as proteins) particularly enzymes

  5. 2) Characteristics of Acids and Bases • Acids tend to taste sour and react with metals • Bases tend to taste bitter and feel soapy

  6. 3) What is the pH scale? • The pH scale is used to see how acidy something is. • The scale ranges from 1 to 14. • The closer to 1 something is, the more acidy it is. • The more closer to 14 something is, the least acid (or basic) it is. • Something with the pH of 7 is said to be neutral. Plain water has a ph of 7.

  7. 4) What happens when acids and bases come into contact with each other? • They react and neutralize (cancel) each other. ACID + BASE  WATER + SALT • For this reason, acids and bases are considered “opposites.” • Therefore, if a solution is too acidic what can we add to neutralize it? A base!

  8. Tomatoes Lake water Soapy water Battery Acid Stomach Acid Lemon juice Orange juice Bananas Ocean water Baking Soda Ammonia Sodium Hydroxide Pee (urine) Water Oven Cleaner 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

  9. 5) So why is pH important to biology? • pH will effect the shape of protein molecules. • So if a protein’s shape is changed, can it do its job? • Each type of protein has its own pH where it works the best. This is called its Optimum pH.

  10. What does optimum look like on a graph? • The graph resembles a hill. • The optimum is the highest point.

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