Water 2.2

In this section you will learn everything about the water, about its composition, polarity, hydrogen bonds and what makes water so unique in terms of its physical properties. You will also have the chance to look at how solubility of a substance determines the method of transportation in the blood. 

Key concepts

Learn and test your biological vocabulary for 2.2 Water using these flashcards.

Essentials

These slides summarise the essential understanding and skills in this topic. 
They contain short explanations in text and images - good revision for all students.

Read the slides and look up any words or details you find difficult to understand.

Summary

Summary list for 2.2 Water 

  • Hydrogen bonds form between polar water molecules.
  • This force give water special properties, e.g. cohesiveness, adhesiveness, thermal
    and solvent properties.
  • Glucose, amino acids and salts are hydrophilic while cholesterol and fats are hydrophobic.
  • Compare the thermal properties of water with those of methane and explain how this affects its use a as a coolant in sweat.
  • Compare the solubility of glucose, amino acids, cholesterol, fats, oxygen and sodium chloride in water and link this to the way they are transported.
  • Explain benefits of water properties to living organisms (Transparency and density not required).
  • Evaluate how significant hydrogen bonding is in the properties of water

Mindmaps

These diagram summaries cover the main sections of topic 2.2 Water
Study them and draw your own list or concept map from memory.

 

Exam style questions

Exam style question about hydrogen bonding

Understanding the way in which hydrogen bonding affects water molecules is an important skill from this topic.

Answer the question below on a piece of paper, then check your answer against the model answer below.

Outline the properties of water which result from hydrogen bonding between water molecules  [4]

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Click the + icon to see a model answer.

Extra exam question

More questions coming soon.

Test yourself

This is a self marking quiz containing questions covering the topic outlined above.
Try the questions to check your understanding.


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Just for fun

Everyone needs a bit of fun while they revise. Try this Water wordshoot revision game. Can you reach the leader board?