National Chemistry

1998 Credit First thoughts

Credit 1998 First thoughts

1998 CREDIT First thoughts

1. (a) Protons + neutrons - probably nothing to do with electrons then.
(b) Look at page 1 of data book.

2.(a) Reduction is on page 7
(b) Should make an acid.
(c) Both should have an acid at the start.
Unlikely that any box is used twice.

3. Write out the molecular formulae of each box.
(a) Look at the molecular formula you have written
(b) Look at the molecular formula you have written

4. Remember OP and HI for Haber and Oswald process
(a) Where are enzymes found?
(b) TWO answers. two of them start with hydrogen.

5. (a) NOT making faster
(b) TWO ways to get more product.

6.(a) glucose ---> starch
(b) TWO reaction - look at the equation involved
Unlikely that any box is used twice.
Try and get rid of wrong answers.

7.TWO answers - corrosion so page 7 may help.

8. TWO answers.
Treat each statement as true/false

part 2

9(a) definition you should know. Look at the example for clues.
(b) is it an atom or an ion - this would effect the number of electrons
(c) think about the photosynthesis equation.

10. (a) Use the words in the diagram.
(b)(i) get the electron arrangement of chlorine.
(ii) Solid - high melting point.

11. (a) Spectators do not take part.
(b) When drawing it make sure you draw a liquid in each beakers

12. (a) Look at the diagram and the equations.
(b) Compare the two in the equations
(c) Fe2O3 + CO ---> Fe + CO2
(d) Percentage is actually total mass of 100g.

13.(a)(i) What is this subject?
(ii) Disadvantage of a battery?
(b) Look at the equation. use page 7
(c) Think about how you set up cells. back to Q10 - what is needed/

14. Looks complicated but it is not.
Just read carefully - mark the two examples on the graph.
TWO trends

15. (a) As x-axes (along the way) increases what happens to the y-axes
(b) So it is pH 1 and increases when heated. Use the graph.
16.(a) SOD!
(b) Test for ammonia. need to know
(c) Ammonium "what" would react with barium chloride to make solid - page 5

17. READ from the top.
(a) What is in the flask?
(b) What makes this fast?
(d) look at boiling points - this may help with part (c)

18. (a) (i) You have two figures - calculate the third. (if you cannot calculate put 5)
(ii) 1 silver with 1 chloride. use figure from part (i)
Part (a) told the silver therefore how much chloride ? (if you cannot calculate put 5)
(iii) use figure from part (ii). Mass mentioned so need mass 1 mole.
(b) Write down the ions - use page 4.

19. (a) Look at the structure.
(b) salt must have something that ethylene glycol does not.
(c) remove the oxygen from the water.

20. (a) Two or more metals - page 7
(b) see the pattern
(c) TWO ways - look at the diagram.
(d) Think about what you could see!

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