ACIDS AND ALKALIS (CHEMICAL SYNTHESIS)

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To review the characteristic reactions of acids and alkalis
To Planning a synthesis involves calculating how much of the reactants to mix together to make the amount of product required.
practise writing word and symbol equations.

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ACIDS AND ALKALIS (CHEMICAL SYNTHESIS)

  1. 1. Why study chemical synthesis? <ul><li>Q1. Which of the following is correct </li></ul><ul><li>We use chemicals to </li></ul><ul><li>Preserve food. </li></ul><ul><li>Treat disease and in health care </li></ul><ul><li>Decorate our homes. </li></ul><ul><li>Modern sporting materials </li></ul><ul><li>Many of these chemicals are synthetic. </li></ul>ACIDS AND ALKALIS
  2. 2. ACIDS AND ALKALIS AIMS: To review the characteristic reactions of acids To practise writing word and symbol equations.
  3. 3. Water sodium hydroxide hydrochloric acid sodium chloride Copy and link the symbols to their names
  4. 4. For any reaction, what you start with are called the reactants, and what you form are called the products. 1. The reactants are one molecule of Sodium ……………. and one molecule of ……………… acid 2. The products are one molecule of…………….. and one molecule of ………………. 3. Are all chemicals involved compounds or elements Complete the sentences below
  5. 5. Look at the equations above and explain the difference
  6. 7. Acid reactions 1. acid + metal salt + hydrogen 2. acid + metal oxide salt + water 3. acid + metal carbonate salt + carbon dioxide + water Your Task UNDERSTAND THE RULES ABOVE FOR REACTION OF ACIDS WITH METALS, METAL OXIDES AND METAL CARBONATES
  7. 8. + + + YOUR TASK: COPY AND COMPLETE EQUATIONS
  8. 9. Acids with Metals Put about 5 cm3 of dilute acid in a test tube. Add a small piece of magnesium ribbon. If a gas forms, trap some by putting a finger over the end of the tube. After a while test the gas with a burning splint. What is your observation?
  9. 10. Acids with Metal oxides Put about 5 cm3 of dilute acid in a test tube. Add a small spatula measure of black copper oxide. Warm gently. Filter, collecting the filtrate in a test tube. Note the colour of the solution after filtering. Record your observations .
  10. 11. Acids with Metal carbonates Put about 5 cm3 of dilute acid in a test tube. Add a couple of marble chips (calcium carbonate). If a gas forms, use a delivery tube to bubble the gas through limewater in another test tube.
  11. 12. TASK Write word equations to describe the reactions of hydrochloric acid with magnesium, with copper oxide, and with sodium carbonate.
  12. 13. Answer True/False and explain your choice of answer 1. Chemists who synthesize new chemicals need knowledge of science explanations combined with practical skills. 2. It is important to understand how to control reactions so that they are neither too slow or dangerously fast. 3. Planning a synthesis involves calculating how much of the reactants to mix together to make the amount of product required.
  13. 14. <ul><li>Demonstrate the fountain experiment (Activity AC6.2 Acids and alkalis ) to emphasize that hydrochloric acid is a solution of HCl gas. </li></ul>

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