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B6: BRAIN AND MIND REVISION NOTES

The CNS (see left) allows organisms to react to
their surroundings or stimuli and coordinate
their responses.

Animals respond to stimuli (change in
environment) in order to keep themselves in
favourable conditions.

The CNS is connected to the body via sensory
and motor neurons…

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REFLEXES

Simple reflexes produce rapid involuntary/automatic responses
These involve both sensory and motor neurons
Animals use these simple reflexes to help find food, shelter from predators, find a
mate or avoid injuries, they rely on reflex actions for the majority of their
behaviour
However, the disadvantage of this type of…

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Every time a new experience happens, a different pathway between neurons is
stimulated, and as experiences are repeated, this is strengthened, with frequently
activated pathways being preserved and any pathways not used regularly being
deleted.
This means many skills can be learnt through repetition such as in revising
The variety…

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C6: WAVE MODEL OF RADIATION REVISION NOTES

WHAT ARE WAVES?
A wave consists of disturbances that transfer energy in the direction that the wave travels,
without transferring matter, there are two different types of waves (see below)
A longitudinal wave is when each particle moves backwards and fowards in the…

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INTERFERENCE

When two waves meet, their effects can add up, this is called interference.
Constructive Interference: When they arrive in step they reinforce each other,
adding up their amplitudes
Destructive Interference: When they arrive out of step they cancel each other
out as the peak of one can meet the…

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Analogue Signals

In AM, the amplitude of the carrier wave is changed by the input signal. In FM, the input
signal causes the frequency of the carrier wave to change. Both these signals vary in
exactly the same way as the information it is carrying and can have almost any…

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Measured using a universal indicator
When dissolved in water, acidic compounds produce aqueous hydrogen ions.
When dissolved in water, alkali compounds produce hydroxide ions.

N F State at Room
a o Temp
m r
e m
u
l
a
e

t
o

R
e
m
e
m
b
e
r…

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Hydrochloric Acid HCl Gas

C
o
m
m
o
n

A
l
k
a
l
i
s

Sodium Hydroxide NaOH -

Potassium KOH -
Hydroxide

Magnesium Mg(OH)2 -
Hydroxide

Calcium Hydroxide Ca(OH)2 -




Neutralisation

When an acid and a base are mixed together in the correct amounts, they cancel
each…

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Oxygen O2




Chemical Synthesis

Reactants react to produce products and the greater the reactants used, the
greater the product formed. You can calculate the percentage yield:
Percentage Yield = Actual yield/Theoretical yield x 100
This shows how much you produced compared to what you expected.

Stages to Chemical Synthesis

1.…

Page 10

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1. Write down the equation

CaCO3 -> CaO + CO2

2. Work out the formula mass of each substance

40+12+(3x16) -> (40+16) + (12+(2x16))

3. Check total mass for both equals up

100->56+44

4. You can then write the ratio, ignoring carbon dioxide as the question does not
mention it…

Comments

Sanjeeda Jalil

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This was really useful as I have an exam tomorrow.

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