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The rate of photosynthesis is affected by:

1. Light intensity - without enough light, cells cannot photosynthesize even if there is an excess of carbon dioxide and water

2. Ca...

Mg2+ is the smaller ion. (1 mark) Mg2+ has a larger nuclear charge than Na+ and has the same number of electrons. (1 mark)

Further explaination: Magnesium is further along the period than sodium is...

6a + b = 16 (1)

5a - 2b = 19 (2)

(1) x 2: 12a + 2b =32

(1) + (2): 12a + 2b + 5a - 2b = 32 + 19 = 51

17a = 51

a = 51 / 17 = 3

Substitue a = 3 back into (1): (6 x 3...

Now although this might seem like quite a complex question at first, it's a little less intimidating when we take a while to look at it- you might notice that we can seperate x and y terms like so:
1...

The most popular and useful way of remembering when to use être in the perfect tense, is the MRS VANDERTRAMP list: Monter, Retourner, Sortir, Venir, Arriver, Naitre, Descendre, Entrer, Re...