National Chemistry

2008 Credit First thoughts

Credit  2008    First thoughts

 

 

                           SQA Answers

CREDIT   First thoughts

 

1. (a) Which gases are obviously not toxic?

(b) Really only two to pick from.

(c) Used up during breathing.

Likely that all answers are different.

 

2. (a) Particle size must change. Other variable stay the same.

(b) No reaction usually has something to do with unreactive metal.

 

3. Write in the molecular formula for each box.

            (a) Two structures should stand out for polymerisation.

           (b) Fit the general formula and DO NOT decolourise bromine.

 

4 (a) page 8 of data book

(b) Acids from metals or non-metals?

(c)  Alkali metals for group 1.

 

5. Five reactions

     (a) Acid reaction

     (b) Perhaps from the list you can spot two ways of describing the one reaction.

 

6. Read the question to spot the odd one out.

 

7. Is the carbohydrate list in the order you are use to.

 (a) Mono – which pair

(b) Odd one out

 

8. Two correct. Try each as true or false.

 

9. Two correct. Try each as true or false.

 

Part 2

 

10. (a) Group 7

      (b) Covalent bond – second choice looks easier.

(c) Ignore X just concentrate on size.

 

11. (a) Page 7 of data book

(b) Rate – increases or decrease

(c) ‘Protection’ by magnesium

 

12. (a) Label the axes (using the words in the table) mark on scales using

more than half the graph paper.

(b) Copy out the equation and complete the working below it.

(c) Where do you use airbags?

 

13. (a) Why use with power supply?

(b) Copy from page 7

(c) ionic compounds conduct using what ?

 

14. (a) CARBO  HY drATE

(b) Failed both tests. Use list for Q7 to help identify it.

(c) 330 and 0.01 are two of the figures. Calculate the third.

 

15. (a) Mass of proton; name of particle spinning around nucleus (hint not proton)

(b) (i) use 234 and 90 to get the protons and neutrons

(ii) Look at the example at the start of the question. What happens to the numbers?

 

16. (a) Mass is mentioned therefore mass of 1 mole will be required.

(b) Page 7 to compare lead and aluminium

(c) More reactive than both, less reactive than both ; in between?

(d) Use page 7.

 

17. (a) Use page 7 – mark each of the metals.

(b) (i) Spectator does nothing.

(ii) What state is the copper in?

 

18. (a) Energy in the atmosphere?

(b)

(c) A nitrogen compound?

(d) As temperature increases/decreases solubility .........?

 

19. (a) What is meant by 2-methyl?

(b) Must know this definition.

(c) Fill in the missing number ! Write it below.

 

20. (a) Copy out the equation and underline the chemical told about and asked about.

(b) Page 7 gives possible charges

(c) (i) Look at the equations.

(ii) Well look up the melting and boiling point of the thing at the bottom of the balst furnace.