National Chemistry

2006 Credit First thoughts

Credit  2006    First thoughts

 

 

                           SQA Answers

 

 

 

1.(a) Process and catalyst in alphabetical order.

(b) Most important metal

(c) page 2

Probably three different answers - so answer the ones you  are sure of first.

 

2. Write molecular formula in the boxes.

(a) Should know the definition.

(b) name the three homologous series that you know well.

 

3.(a) Several clues: poisonous; incomplete combustion; of hydrocarbon

(b) Lightning storm takes place in air.

(c) What is the formula of ammonia?

 

4.(a) What are group 1 metals called?

(b) What type of elements in covalent substances?

 

5. (a)  mark them on page 1

(b) Write doen the electron arrangement of argon.

(c) Write the ions in the boxes.

 

6. Probably three different answers - so answer the ones you  are sure of first.

look at the reactions - write clues to each reaction in the box eg precipitation

 makes a solid.

(a) Ethene !

(b) Reactant is a metal - page 7

(c) TWO required. name the reactants

 

7. (a) What must be present as reactants to form H2O

(b) Not reacting - probably involves unreactive metal

 

part 2

 

8. (a) How many carbons in the centre of the monomer?

(b) Something happens when heated.

 

9. (a) (i) look at the examples.

(ii) Must be one of the examples.

(iii) use the figures given by the examples.

(b) You only know one shape.

 

10. read question from top of page.

(a) Mark on the wire. Look at the reaction.

(b) page 7

(c)

 

11. 9a) Rust is iron oxide.

(b) Mass is mentioned. Start with mass of 1 mole.

(c) Write the two ions.

 

12. (a) Label (use the words in the table) and put scales on axes.

(b)Put a mark on the graph.

(c) What difference would a higher temperature make to the reaction.

 

13. (a) List your five carbohydrates.

(b) Name the reaction. six are mentioned in Q6.

(c)(i) How many carbons?

(ii) Testing for acid/alkali. Group 1 metals are called .....?

 

14. (a) oxygen is where ?

(b) Why is it better than petrol /

(c) Copy from page 7

 

15. (a) Copy out the equation and underline the chemicals you are told about and asked about.

(b) What is the percentages in air?

 

16. Read question from top of page.

(a) Copy out equation so you can do the working. H appears in too many places so leave it till last.

(b) What is special about ammonia?

(c) The water has gone from 25oC to -5oC.

 

17. Read question from top of paper.

(a) breaking up using electricity.

(b) (i) Must be one of the three given.

(ii) What are the types of bonding.

(iii) SEEN (colour, gas, solid etc) at +ve.

 

18. Looks like titration. Circle figures in diagram.

(a) using 16.3, 15.5 and 15.7. At least guess one.

(b) use answer from (a) and circled figures.

(c) Solid from solution?

 

19. Study diagram. Go over the alcohol with your pen then mark where theses atoms appear on the right hand side.

(b) If you cannot remember Q6 list six reactions.