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Explain, in terms of electrons, why
potassium reacts more violently than
sodium.
3marks ­ Jun 08…read more

Slide 3

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Describe one piece of evidence to support the Law of Octaves.
·Suggest two reasons why other chemists did not accept Newlands' ideas.
4 marks combined ­ Jun 08…read more

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A piece of eight has a mass of 27.06 g, and is 90% silver.
Calculate the number of moles of silver in a piece of eight.
Relative atomic mass: Ag=108
27.06g / 108 = 0.25
0.25 x 0.90 = 0.2255
Moles of silver: 0.2255
2 marks ­ Jun 08…read more

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Breaking bonds Making bonds
(8 x 435) (6 x 435) C-H
498 (2 x 805) C-O
= 3978 (2 x 464) O-H
= 5148
3978-5148 = -1170
-1170
3 marks ­ Jun 08…read more

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Describe how water in the United Kingdom
is treated.
Explain how this makes it safe to drink.
3 marks ­ Jun 08…read more

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