BASIC FACTS ABOUT ACIDS AND ALKALIS
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BASIC FACTS ABOUT ACIDS AND ALKALIS

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    BASIC FACTS ABOUT ACIDS AND ALKALIS BASIC FACTS ABOUT ACIDS AND ALKALIS Presentation Transcript

    • 24/02/11 TELLING THEM APART ACIDS & ALKALIS Chapter One
    • What are Acids? 24/02/11 YOUR TASK Write down all you know about Acids.
    • PROPERTIES OF ACIDS 24/02/11
      • Acids have a sour taste.
      • Acids turn litmus solution red and turn blue litmus paper red.
      • Acids have pH numbers less than 7 that is pH 1-6.
    • PROPERTIES OF ACIDS 24/02/11
      • Acids have pH numbers less than 7 that is pH 1-6.
      • The lower the pH the stronger the Acid.
      • The higher the pH the weaker the Acid.
    • Strong And Weak Acids 24/02/11 An Acid is classified as strong or weak depending on its ability to dissociate in water. Acids dissociates when the turn from molecule into ions when dissolved in water.
    • Strong Or Weak Acid 24/02/11 A strong Acid dissociates completely in water. E.g Sulphuric Acid or Nitric Acid A weak Acid dissociates partially in water e.g Ethanoic Acid
    • YOUR TASK 24/02/11 Acids have many properties that distinguish them from other substances . Can you write down some of these properties?
    • PROPERTIES OF ACIDS 24/02/11
      • Acids have a sour taste.
      • Acids turn litmus solution red and turn blue litmus paper red.
      • Acids have pH numbers less than 7
      • Acids react with metals, forming hydrogen and a salt
      • Acids react with carbonates, forming a salt, water and carbon dioxide
      • Acids react with alkalis, forming a salt and water
      • Acids react with metal oxides, forming salt and water
    • FACTS ABOUT ACIDS 24/02/11
      • Acids are generally dangerous chemicals.
      • Acid compounds all contain hydrogen.
      • They dissolve in water to produce particles called hydrogen ions.
      • Never drink them or put them near your eyes.
      • Never pour water into a concentrated acid as it heats up and can spit hot acid at you.
    • 24/02/11 How do scientists test for acids and basic solutions? Scientist can test a substance to see whether it is acidic or basic (alkalis) by using an indicator.
    • INDICATORS 24/02/11 What are indicators? Indicators are substances that will change colors when they come in contact with an acid or a base.
    • 24/02/11 Why do we need indicators? Indicators are a safe way to help scientist determine whether a substance is an acid or an alkali.
    • 24/02/11 Remember what we said about acids and alkalis. Often you do not want to come in direct contact with them as they can be harmful.
    • WARNING 24/02/11 Never pour water into a concentrated acid as it heats up and can spit hot acid at you.
    • 24/02/11 ACIDS AND BASES Starter Activity What are Acids and Bases? Name a few examples.
    • FACT 24/02/11 Acids and bases are two important classes of compounds that have different properties from one another.
    • 24/02/11 ACIDS-often give food a sour, sharp flavor (lemon juice) and can be helpful, such as the acids in your stomach. Strong acids can burn your skin. BASES- on the other hand feel bitter and slippery.
    • 24/02/11 The following table shows colour changes and changes range for 4 indicators
    • 24/02/11
      • INDICATORS TYPES AND USES
      • LEARNING OBJECTIVES
      • To understand what indicators are and why scientist use indicators
      • To know the different indicators and how they are used to test for
      • acids and alkalis
      • To understand how to read pH scale and interpret the pH scale
    • ACIDS
      • Acids are materials that have certain properties in common.
      24/02/11
    • BASES
      • Bases (also called alkalis) are other substances with a different set of properties.
      24/02/11
    • FACT YOU SHOULD KNOW 24/02/11 The most striking property of both acids and bases is their ability to change the colour of certain vegetable materials.