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How do I get an A* in biology?

Use the mark schemes. These change very little over the years and were my go to during A levels and GCSEs. Do as many past papers as you can possibly get your hands on and work out what the exam board give m...
ER
Answered by Emily R. • Biology tutor
3444 Views

Explain the trend in first ionisation energy along period 3

Going across a period there is generally an increase in first ionisation energy. This is because there are more protons in each nucleus leading to a greater positive charge and stronger electrostatic force o...
JD
Answered by Jasmine D. • Chemistry tutor
3348 Views

Explain the trend of first ionisation energy down a group.

The first ionisation energy is the energy required to remove one electron from an atom. Down a group, there are more electron shells surrounding the nucleus, which results in a greater shielding from the nuc...
RW
Answered by Rachael W. • Chemistry tutor
2497 Views

g(x) = ( x / (x+3) ) + ( 3(2x+1) / (x^2 + x - 6) ). Show that this can be simplified to: g(x) = (x+1) / (x-2).

Step 1: The denominator of the right-hand fraction is quadratic, so we can factorise this to (x+3)(x-2). This looks similar to the denominator of the left-hand fraction, suggesting we can combine the two. St...
AS
Answered by Amar S. • Maths tutor
6353 Views

Give TWO similarities in the movement of substances by diffusion and by osmosis.

(Movement) down a gradient / from high concentration to low concentration; 2. Passive / not active processes; OR Do not use energy from respiration / from ATP / from metabolism; OR Use energy from the soluti...
MS
Answered by Murtaza S. • Biology tutor
12309 Views