Module 4 Additional Science

These cards are quick, easy and simple revision notes for Module 4 Additonal Science OCR 21st century Science GCSE.

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  • Created by: Sophie
  • Created on: 09-05-11 19:40




Define Homeostasis

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Maintaining a constant internal enviroment.

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In the nucleus of an atom it contains:

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Protons and Neutrons.

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The formula for speed is:

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Speed = Distance/Time

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Strenuous Exercise



The effects of Strenuous Exercise are:

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Strenuous Exercise

Temperature increases - When you exercise you generate heat, so your temperature increases.

Water content - During exercise more water is lost in sweat through the skin as you get hotter and more water vapour is lost from your lungs as your breathing rate increases.

Salt levels - sweat contains salt, so if you sweat a lot the level in your body will decrease.

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Line Spectrums



When heated, what colour flames are produced for Lithium, Sodium and Potassium?

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Line Spectrums


Lithium - produces a red flame

Sodium - produces a yellow/orange flame

Potassium -  produces a lilac flame

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Distannce - time graphs


The gradient for a distance time graph equals...

Flat sections are....

Downhill sections mean...

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Distance - time graphs



..when it's stopped's coming back toward its starting point

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Define Diffusion

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Diffusion is the passive overall movement of particles from a region of their higher concentration to a region of their lower concentration.

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State symbols


What physical state do these state symbols tell you there in?

(s)   (l)    (g)   (aq)

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State symbols


(s) - Solid

(l) - Liquid

(g) - Gas

(aq) - Dissolved in water

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Velocity - time graphs


The gradiet for a Velocity - time graph equals....

Flat sections represent...

Downhill sections are...

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Velocity - time graphs



...steady speed


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Define Osmosis:

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Osmosis is the overall movement of water from a dilute to a more concentrated solution through a partially permeable membrane.

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Really good apart from some spelling mistakes

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