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Acids Bases and pH

Acids Bases and pH. Year 8 Science Mr Kos. Remember: Acids and bases in: A nimal stings Gardening Swimming Pools Reactions with Carbonates Hydroxides Metals. Testing Gold with acids: Scratch the object with a file and apply a drop of Nitric Acid.

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Acids Bases and pH

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  1. Acids Bases and pH Year 8 Science Mr Kos

  2. Remember: Acids and bases in: Animal stings Gardening Swimming Pools Reactions with Carbonates Hydroxides Metals

  3. Testing Gold with acids: Scratch the object with a file and apply a drop of Nitric Acid. If the object turns a bright green it is gold plated or gold filled on base metal. If the object turns a pinkish cream colour it is plated or gold filled on silver. 10 karat gold will turn dark brown. 12 karat gold will turn light brown. 14 karat or higher will have little or no reaction.

  4. Acids and Bases at Work: Your Teeth: Bacteria in your mouth break down food into acids which dissolve the enamel coating of your teeth Pickling: Foods can be stored in vinegar to help preserve them and prevent bacteria from growing

  5. Date: Title: Reactions of Metals with acid. Partner: Introduction: Acids react with many substances and form different compounds. When acids react with metals, they form a salt and hydrogen gas. Hydrogen gas is explosive and when released in this reaction, will pop if exposed to a match. Aim: To investigate the reaction of acids and metals Hypothesis:

  6. Materials: Safety glasses Bench mat Various metals 2M Hydrochloric acid Rubber stopper Matches Test Tube

  7. Method: Place one of the small pieces of metal in a test tube. Add 1cm depth of acid to the tube Write down what happens? Holding the tube away from your face, cover the end of the tube with a rubber stopper DO NOT PUSH IT IN. After a couple of seconds, remove the stopper and place a lighted match over the end Write down what happens? Repeat with the other metals Results:

  8. Discussion: When zinc metal reacts with hydrochloric acid it results in zinc chloride (a salt) and hydrogen gas. Write a word equation for this reaction. When the hydrogen combusts (is ignited) it reacts with the oxygen in air to form water. Write a word equation for this reaction. Why isn’t the stopper jammed into the tube? Any improvements? Conclusion:

  9. Acid Rain Causes Acid rain comes from excessive sulfur dioxide and nitrogen dioxide in the atmosphere. This affects forests, rivers, crops and even buildings and statues. The gases come from burning fossil fuels and also gases from volcanoes

  10. Acid Rain Damage The damage to the trees comes from the acid damaging the surface of the leaves. It causes the pH of the waterways to drop, killing aquatic life. The acid can also react with the minerals in the soil releasing other elements like aluminium that can poison wildlife. The damage to the buildings is acid reacting with calcium carbonate

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