Test n° 5
Text :
Acid rain is a result of air pollution, when any type of fuel is burnt, The smoke that comes from a fire or the fumes that came out of a car exhaust, don’t just contain the sooty grey particles that you can see; they also contain lots of invisible gases that can be even more harmful to the environment.
Power stations, factories and cars all burn fuels and therefore they all produce polluting gases. Some of these gases (especially nitrogen oxides and sulphure dioxide) react with the tiny droplets of water in clouds to form sulphuric and nitric acids. The rain from these clouds then fall as very weak acid- this is why it is known as “acid rain”.
Acid rain is measured using a scale called”PH”. The lower a substance is ph the more acidic it is. Pure water has a PH of 7.0. Normal rain is slightly acidic because carbon dioxide dissolves into it, so it has a PH of about 5.5.
If man continues to produce chemical wastes, he will soon destroy the entire planet.
different chemicals are produced.
Questions
1)Answer the following questions according to the text .
a) What can cause acid rain? b) What’s the consequence of gas burning?
c)How can you measure the pureness of water ?
d)Is water which has a ph of 4.3 acidic ? Justify your answer.
2) Give the text a suitable title.
3) Match a word from A with its appropriate synonyms or definition in B.
A B
1)exhaust
2)harmful
3)fuel
4)scale
5)slightly
6)cloud a)not very much, only a little .
b)A range of measurement in a particular system .
c)a white or grey mass of very small drops of water in the sky .
d)gases or steam produced by an engine as it works .
e) Causing harm, damage or problems, having bad effects.
f)a substance such as oil; gas coal or wood that produces heat or power when it is burnt .
1( ) 2( ) 3( ) 4( ) 5( ) 6( )
4)Match words with opposites .
Words : 1)tiny 2)harmful 3)weak 4)pure
Opposites : a)strong b)big c)contaminated d)harmless
1( ) 2( ) 3( ) 4( )
5)Fill in the gaps with one of the words given below .
Can – burn – gases – pollution – will – rain
Very strong acids …1.. burn if they touch your skin and …2.. even destroy ****ls. Acid …3.. is much, much weaker than this, never acidic enough to …4.. your skin .
6) Reorder the sentences into a coherent paragraph.
a) O is the most acidic and 14 is the most alkaline.
b) Acidity is measured using a scale of PH scale.
c) Something with a PH value of 7 is called neutral.
d) This scale goes from O to 14.