National Chemistry

2004 Credit First thoughts

1. (a) What elements are in air?
(b) What elements are in a hydrocarbon?

2. Write the molecular formula -use page 6 for number of carbons.
(a) page 6
(b) Definition
(c) One of them must be different enough to be the only one which reacts.

3. (a) Reacts with acid.
(b) Page 5 of data book You will have to attempt each pair.
(c) write the charge on the ions above each name.

4. (a) Concentration is the only value changed.
(b) Match concentration, temperature. metal and particle size to fastest.
Suggest metal first - page 7.

5. (a) When do ionic conduct- must be two the same.
(b) Needs to be COVALENT and NETWORK.

6. (a) definition must be learned.
(b) Write out electron arrangement of argon and for each of the six boxes.

7. Charge, mass and position of electron.

8. Write list of the five carbohydrates and match up what they have in common. Then it is a true or false for each letter.

9. diagram tells which electrode is +ve and which -ve. Use the reactions given.
Treat statements as true or false.

part 2

10. (a) How many carbons on main part of monomer?
(b) Look at the elements present. What would they burn to give?

11. (a) need to lear this definition.
(b) (i) How much of the coin is aluminium ?
(ii) Use figure from part (i). If you do not have a figure just use 5.74g
Since grams then mass of 1 mole required.

12.(a) What are the products of the reaction?
(b)Label the axes using the words in the table. Create scales using at least half the graph paper.
c) What effect has doubling the concentration got on amount produced?
(d)You are told the chemical name of marble chips earlier in the question.

13.(a) the diagram gives clues as to what to write about.
(b) (i) The diagram tells you what the dots are. Draw nitrogen out.
(ii) You only know one shape.

14. Write out the molecular formulae.
(a)(i) How many bond for each atom – you can count in the diagram.
(ii)Use the molecular formulae
(b) Again look at the molecular formulae.

15. Read the information above and below the diagram.
(a) Mark on the wire.
(b) Show usually means a test.

16. (a) Definition should be known
(b) When metals are or are not doing something page 7 helps.
(c) Copy from the data book page 7.
(d) TWO marks. Again comparing metals page 7 helps.

17. (a) Write out the ions – page 4 helps.
(b) (i) Copy out the equation and put working underneath.
(ii) Silver appears.
(c) Mass is mentioned so need mass of 1 mole.

18. (a) Where has the ammonia gone!
(b)What is pH of ammonia?

19. (a) read off of the graph.
(b) Draw a line on the graph and take the reading.

20.Write out molecular formulae for each molecule.
 (a) Definition should be known.
(b) use molecular formulae to make this up.
(c) Draw the bromine atoms onto the structure on the paper.
(d) Definition should be known. New structure must have one C=C.

21.Titration. Circle figures from the diagram.
(a) Look at what is in the flask.
(b)(i) The figures from the experiment are 21.2, 20.7 and 20.5.
(ii) Calculation using answer from part (i) – so at least select a figure. What other figure has to do with the acid ? Find the third figure (answer)
(iii) The answer from (ii) is for the acid. Use the equation to find the figure for the potassium hydroxide.
If you have not worked out an answer for part (ii) put in 5 and use that for part (iii).

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