Water and Hydrogen Questions and Answers
QUESTION 1.
Use the information shown in the diagram below to answer the questions that follow.
i) Explain why it is important to pass the hydrogen gas for some time before
lighting it at point Z. (1mk)
ii) Write an equation for the reaction that takes place when hydrogen burns at
point Z.
ANSWER
i) If ignited immediately explosion would occur because it would still be
mixed with air.
ii) 2H2(g) + O2(g) 2H2O (g)
QUESTION 2.
The order of reactivity of metal p, R and T starting with the most reactive is
R.T.P. By using a tick (√) to indicate no reaction, complete the table below to
show what happens when the metals of each are added to solutions containing
ions of metal P, R and T.
ANSWER
QUESTION 3.
In an experiment, soap solution was added to three separate samples of water.
The table below shows the volumes of soap solution required to form a lather with
100cm3
of each sample of water before and after boiling.
a) Which water sample is likely to be soft? Explain. (2mks)
b) Explain the change in the volume of soap solution used in sample III
ANSWER
a) Sample II: because the volume of soap used is less i.e. 3.0 cm3 and
remains the same after boiling.
b) Sample III is temporarily had water because after boiling it became soft. The volume of soap changed from 10.6 to 3.0 cm3
QUESTION 4.
Study the diagram below and answer the questions that follow.
Write an equation for each of the two reactions that take place in the experiment
represented by the diagram above.
2HCl(aq) + Zn(s) → ZnCl2(aq) + H2
2H2(g) + O2(g) → 2H2O (g)
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