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CHEMISTRY (TB)

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  • I am a mixture of indicator dyes, help to know if the solution is acidic or alkaline. Who am I ?
    Universal Indicator
  • Sulfuric acid is a _____________ acid and Citric acid is an ___________ acid.
    Mineral, Organic
  • Descaling of kettles can be done by vinegar and sulfuric acid. TRUE/FALSE (CORRECT IF FALSE)
    FALSE ( VINEGAR AND METHANOIC ACID)
  • Lemon juice helps to treat a bite from a _________ .
    Wasp
  • AMPHOTERIC OXIDES????????????????
    They are oxides of a metal. Behave as acidic or basic oxides.
  • Name the element common to all acids.
    Hydrogen (H)
  • Bee Sting - pick the correct answer (lemon juice, calamine lotion, dock leaves)
    Calamine lotion
  • What is Litmus paper?
    Paper soaked in litmus solution.
  • What is Litmus? ( List 3 things)
    It is the most used indicator. Extracted from lichens. It is purple in neutral solution, red in acidic solution and alkalis turn litmus solution blue.
  • Why has this blue litmus paper turned red?
    It has been dipped into an acidic solution.
  • Explain the reaction of a non metal with oxygen.
    Non metals react with oxygen to form acidic oxides or neutral oxides.
  • Aqueous HCl is acidic because of oxygen ions. True/False
    False (H+ ions)
  • What are these and why are they used?
    These are antacids and they neutralize the excess acid in our stomach and reduce the effects like headaches, pain or burning.
  • Define an oxide.
    An oxide is a compound of oxygen and another element.
  • Name this group of oxides - Insoluble in water and does not have acidic nor basic properties.
    NEUTRAL OXIDES
  • Oxides of non - metals are acidic. TRUE/FALSE
    TRUE
  • This ion makes the solution acidic.
    Hydrogen ion (H+)
  • What is the difference between an acidic and alkaline solution?
    Acidic (H+) Alkaline (OH-) ions
  • List 2 properties of Acidic oxides.
    1) They are oxides of non metals. 2) They are gases at room temperature.
  • On the pH scale, what could 1,2,3,4,5,6,7,8,9,10,11,12,13,14 be?
    pH 7 is neutral, pH less than 7 is acidic, pH more than 7 is alkaline.
  • Sulfur trioxide + water ---> Sulfuric acid. Explain this equation.
    Acidic oxides react with water to produce acids.
  • Differentiate between metal and non - metal oxides.
    METAL OXIDES - SOLID AT ROOM TEMPERATURE, FORM ALKALINE SOLUTIONS NON - METAL OXIDES - GASES A ROOM TEMPERATURE, FORM ACIDIC SOLUTIONS
  • What causes indigestion?
    Excess HCl in our stomach.
  • Red Litmus paper turns blue. The solution is _______ .
    Alkaline
  • "Brush your teeth 2-3 times daily" - Something we do daily, explain in detail why?
    Sugars from the food we eat, feed bacteria which make acids which are corrosive, they start damaging our tooth surfaces, leading to tooth decay. Toothpaste...
  • This soil is acidic. How can we make it alkaline?
    Use a lime fertiliser.
  • WHAT IS AN ACID?
    SOUR TASTE, STINGING FEELING, CORROSIVE, pH < 7, PRODUCES HYDROGEN IONS IN WATER, CAN CONDUCT ELECTRICITY
  • Substances that change color if they are put into an acid or alkaline solution.
    Indicators
  • Salt and water are produced. What could be the reactants?
    an alkali and an acid.
  • NAME THE TWO TYPES OF ACIDS
    ORGANIC ACIDS AND MINERAL ACIDS
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