National Chemistry

2001 General HINTS

1. (a) Use the data book - do not guess.
(b) Use the data book - page 8
remember to pick 2 boxes

(c) catalytic converter is used in cars - must be solid.

2. Identify chemicals used to test for substances given in each question.
This should be three different answers.
Read all three questions and do in order you find easiest.
Look at the five chemicals all are used in tests try to identify what each tests for.
These last two instructions may help eliminate possible answers.
(a) Starch - a carbohydrate
(b) Glucose - another carbohydrate
(c) Unsaturated - C=C

3. (a) Look at the spelling.
>remember to pick 2 boxes

(b) You have "eth", "pent", "prop" and "hex as beginnings indicating the number of carbons.
(c) Page 6 of data book look for each of the six substances and record their boiling points in the appropriate boxes.

4. (a) galvaniZe
(b) Page 4 of data book - look at flame tests
(c) Not elements
remember to pick 2 boxes

5. Six reactions you could recognise
(a) C=C should give this away
(b) Acid reaction should give this away

6. Useful to know about gases.
Try and write the formula for each in the boxes to help.
(a) pH paper blue + alkaline gas
(b) Carbon and hydrogen only
(c) Taken in by plant during photosynthesis
(d) Must be gases present in the air
remember to pick 2 boxe

In this style of question then there are TWO correct answers and three wrong answers
- work through each statement individuaally deciding if it is True/ False.
Watch for statements that are the opposite of each other - both cannot be correct and one usually is.
each statement must be TRUE for both gold and silver

A. page 8 of the data book and identify the position of each
B. both metals
C.. found as pure metals ?
D. page 7 - are these metals unreactive ?
E. page 7 - compare to copper

Part 2

8. (a) Draw on diagram position of electrons found in fluorine - page 1 gives electronic configuration
(b) Found in atoms are protons, electrons and neutrons.
Neutral means no charge

9. (a) (i) carbon dioxide is a non-metal oxide
sodium oxide is a metal oxide
pH is a number
(ii) Check page 5 of the data book - the solubility tables
(b) sodium + oxygen -------> .......................

10. (a) Create the repeating unit be changing the C=C to single bond
3 monomer units would be 6 C joined together
(b) Shaped when warmed - "thermo" is the word meaning heat
(c) label both axes; put on the scale; make sure over half the graph paper is used;
make sure it is a bar graph.

11. (a) Catalyst sees not seem to take part in the reaction. So what is the benefit ?
(b) When making a statement about a relationship given in a graph you can usually
frame your answer as follows :-
 "As the data along the way increases then the data up the way increases or decreases (pick one)"
(c) It must be bad !!
(d) a minimum for a table is

The headings are obvious when taken from a pie chart - every figure should appear
connected to a description.

12. (a) Something to do with ELECTRicity.
(b) Why did it go to the negative electrode ?
(c) If you can SEE it - colour change; solid formed; bubbles of gas etc.
(d) Suitable for ELECTRodes.

13. (a) Chemical name for rust ?
Gases in air ?
One fifth is in bold.
(b) Larger piece of iron
Have you changed the amount of air ?
(c) For the iron ION not compound.
Use data book page 7

14. (a) (i) There are two Industrial processes associated with nitrogen Chemistry.
(ii) nitrogen dioxide + air + X go into absorber nitric acid appears
(b) Why was nitrogen chemistry so important ?

15. (a) (i) what is chemistry all about ?
What supplies the electrons ?
(ii) use your common sense
(b) (i) Use page 7 to help.
  Draw the arrow on or above the wire NOT on the potato.
(ii) Replacing a metal in a cell would increase or decrease the voltage.
Use page 7 to help.

16. (a) Volume at end of reaction.
Make sure it is experiment A (it is not 22cm3 !!!)
(b) SAME volume and concentration must have something the SAME on the graph.
(c) Must be something different between A and B at the start of the graph.
(d) Definition of a catalyst ?

17. (a) A refining process.
(b) Lower viscosity so lower/higher boiling point ?
(c) use everything in picture. It is a comparison so do something to petrol and then
the same to lubricating oil.

18. (a)(i)Write the formula of an element in group 7 such as chlorine.
Perhaps you can find it on page 7 of the data book.
"di" means what ?
(ii) What type of bonding present in elements at right hand side of Periodic table ?

What type of bonding present in a molecule ?
(b) (i) When making a statement about a relationship given in a table you can usually
frame your answer as follows "As the data in first column increases then the data in the second column increases or decreases (pick one)"
(ii) Look at the figures and estimate the missing value.

2001 General
   Almost the answers

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