EASY
Upper Secondary: IGCSE
IMPORTANT
Earn 100

For one of the examples of diffusion, draw a diagram showing the particles before and after diffusion has taken place.

Important Questions on States of Matter

EASY
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 1 - States of Matter>Q>Q 3
A gas is in a sealed container. How do you think the pressure will change if the container is cooled? Explain your answer. 
 
EASY
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 1 - States of Matter>Q>Q 5
Why does the scent of perfume spread? 
 
EASY
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 1 - States of Matter>Q>Q 5
Why does the scent of perfume wear off faster in warm weather than in cold? 
 
EASY
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 1 - States of Matter>Q>Q 6
Of all gases, hydrogen diffuses fastest at any given temperature. What can you tell from this?
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 1 - States of Matter>Q>Q 7

Look at the glass tube below. Suppose it was warmed a little in an oven, before the experiment. Do you think that would change the result? If so, how? 
      

                                                The particles in hydrogen chloride gas are twice as heavy as those in ammonia gas.
• Cotton wool soaked in ammonia solution is put into one end of a long tube (at A below). It gives off ammonia gas. 
• At the same time, cotton wool soaked in hydrochloric acid is put into the other end of the tube (at B). It gives off hydrogen chloride gas. 
• The gases diffuse along the tube. White smoke forms where they meet: 

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