National Chemistry

2004 Credit Hints

1. (a) What elements are in air? Oxygen and nitrogen
(b) What elements are in a hydrocarbon? Carbon and hydrogen

2. Write the molecular formula - -use page 6 for number of carbons.
4C; 5C; 4C; 3C; 2C 4C;
(a) page 6
(b) Definition - same molecular formula ........
(c) Which family of hydrocarbons reacts with bromine

3. (a) What were the different substances that reacted with acids?
(b) Page 5 of data book You will have to attempt each pair. Magnesium with each of the other second names and so on.
(c) Write the charge on the ions above each name. +2; and -1; +1 and -1; +1 and -1; +1 and -1; +1 and -2; +1 and -1

4. (a) Concentration is the only value changed.

2 mole/l 1 mole/l
  A B
  D C
  F E
Write down beside the letters the metal which appears in the box.

(b) Match concentration, temperature. metal and particle size to fastest.
Page 7 identifies the most reactive metal

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

6. (a) Definition must be learned. Same atomic number ........
(b) Write out electron arrangement of argon (2.8.8)and for each of the six boxes. Some are ions and some are atoms.

7. Charge, mass and position of electron (around nucleus)

8. Write list of the five carbohydrates (fructose, glucose, maltose, sucrose, starch) 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.
A. +ve ions move to +ve electrode T/F
B. Ni used up at +ve electrode T/F
C. galvaniSINg T/F
D. oxidation (OIL) at +ve electrode V
E. solutION T/F

part 2

10. (a) How many carbons on main part of monomer? 2
(b) Look at the elements present - C, N, H What would they burn to give?

11. (a) Need to learn this definition.
(b) (i) How much of the coin is aluminium ? 5%
(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. Al = 27.

12.(a) What are the products of the reaction of acid and carbonate?
(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. Salt from hydrochloric acid.

13.(a) the diagram gives clues as to what to write about - overlapped electrons and nucleus
(b) (i) The diagram tells you what the dots are. Draw nitrogen out showing only outer electrons.
(ii) You only know one shape. Formula is NH3

14. Write out the molecular formulae.
(a)(i) How many bond for each atom – you can count in the diagram. Each C must have four bonds, etc
(ii)Use the molecular formulae - CH4O and CH2O.
(b) Again look at the molecular formulae - CH4O and C2H4O2

15. Read the information above and below the diagram.
(a) Mark on the wire. Which electrode loses the electrons?
(b) Show usually means a test and its result.

16. (a) Definition should be known 'ELECTR'olysis
(b) When metals are or are not doing something page 7 helps. Where is Al ?
(c) Copy from the data book page 7. Make sure you are forming chlorine.
(d) TWO marks. Again comparing metals page 7 helps. Compare Sn and Fe

17. (a) Write out the ions – page 4 helps. Ag+ and HCO32-
(b) (i) Copy out the equation and put working underneath.
  Ag2S + Al ---> Ag + Al2S3

(ii) Silver appears. Involves metals.
(c) Mass is mentioned so need mass of 1 mole.
  Al2S3 = (2 x Al) + (3 x S) for 1 mole.

18. (a) Where has the ammonia gas gone!
(b)What is pH of ammonia? Above 7 or below 7?

19. (a) Read off of the graph. Up from 15 and
(b) Draw a line on the graph along from 0.004 and take the reading.

20.Write out molecular formulae - C4H6; C5H8; C6H10 -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. How many to each double bond.
(d) Definition should be known. New structure must have one C=C and formula must be C4H6.

21.Titration. Circle figures from the diagram 0.20 mol/l and 20cm3
(a) Look at what is in the flask with the reactant.
(b)(i) The figures from the experiment are 21.2, 20.7 and 20.5. Ignore rough result.
If no answer guess 5 and use for next part of question
(ii) Calculation using answer from part (i) – so at least select a figure. What other figure has to do with the acid ? Look at diagram.
You now have two figures. Calculate the third figure (answer)
If no answer guess 5 and use for next part of question
(iii) The answer from (ii) is for the acid.
Use the equation to find the figure for the potassium hydroxide.
H2SO4 + 2KOH ----> K2SO4 + 2H2O
  1 mole with 2 moles

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