Ammonia Acid Worksheet With Answers Page 26
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49(a)
When liquids A and B are mixed a chemical reaction takes place.
(i)
This reaction is exothermic.
Complete the sentence below using a word or phrase from the box.
decrease
increase
stay the same
During the reaction the temperature of the mixture will ...................................... .
(1)
(ii)
When the glue sets it forms a giant covalent structure.
Draw a ring around one property that you would expect the set glue to have.
good conductor of electricity
low melting point
high melting point
(1)
(b)
The time taken for the glue to set at different temperatures is given in the table below.
Temperature in °C
Time taken for the glue to set
20
3 days
60
6 hours
90
1 hour
(i)
Complete the sentences below using words or phrases from the box.
decrease
increase
stay the same
When the temperature is increased the time taken for the glue to set
......................................................................................................................... .
When the temperature is increased the rate of the setting reaction
......................................................................................................................... .
(2)
Page 26 of 49
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