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Group 10.03
Your class work books are on the bench near the fridge in BI1. If they have been moved, do the work on your lab tops and print it off or on lined paper which the cover teacher can ask for from the lab technicians.

Indicators
All of you should have completed the worksheet "acids and alkalis pH" which is in section 4a on the wiki. If you have not then completed it first.

Reactions of acids
1. Do questions 1 to 6 on worksheet "acid reactions" a worksheet which is now also on the wiki in section 4a under 'worksheets'. For question 6 only do the word equations unless you already know how to balance equations. You should be able to answer all questions 1 to 6; if you are stuck do a bit of research!!

2. Go to [|echalk]. Login: username = echalk2@dulwich-shanghai.cn; password = echalk and do "reactions of metals and metal compounds with acids".

Making salts
Read the introduction below.

Sometimes acids are a nuisance e.g. too much acid in your stomach which gives you indeigestion, acid rain, nettle stings, acid spills in labs and so on. We can deal with acids in such situations by neutralizing them. How do we neutralize acids? Acids are corrosive because of the hydrogen ions, H+, that they contain (where these H+ ions come from we will study that when I am back. Neutralizing an acid then involves adding a chemical to the acid which reacts with the H+ ions. Alkalis are such substances as they have hydroxide ions,OH ̄, which can react with the hydrogen ions to form water molecules: H+ + OH ̄ to give H2O.

Bases (metal oxides) and metal carbonates are other compounds which have particles in them that can react with H+ to form water; these particles are oxide ions or carbonate ions. Bases are not soluble whilst alkalis are.

Apart from dealing with nuisance acids (or alkalis), neutralization reactions also produce salts which are very useful compounds and you need to know how they are made.

1. Go to [|acid, base and metals], read all 7 pages, do the activities and finally do the test. I know this is KS3 stuff but you really need to know this very well to make sense of what follows.

4. Go to [|s-cool acids and alkalis], view the 'neutralization' part in step 1 and then do some questions (exam style and multiple choice) in step 2.

5. Go to [|making salts], read all 5 pages and do the test bite on page 5.

6. Now complete questions 7 to 13 on worksheet "acid reactions"

7. You need to know which salts are soluble or not. The list is on page 5 in your handout. Learn it by heart.

How much needs to be done!!!
All of this work should be completed by the end of the week. What you cannot complete in the lesson you should complete as homework for next week.

Extra work: Read "Salts and their preparation" on pages 138 to 142 in your chemistry textbook. In your class work book under the heading "making salts" make a flowchart showing the steps for method A and another one for method B.