a) Diamond and graphite are allotropes of carbon. What is meant by an allotrope?
(b) Explain way graphite can be used as a lubricant while diamond cannot.
Answer:
a)
- These are two or more forms of the same element existing under standard condition
b)
- Graphite atoms are bounded by covalent bonds to form layers which are in turn held by weak vander waal
- These are two or more forms of the same element existing under standard condition
b)
- Graphite atoms are bounded by covalent bonds to form layers which are in turn held by weak vander waal
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in an experiment, soap solution was added to three separate samples of water. The table below shows the volumes of the soap solutions required to form lather with #1000cm^3# of each sample of water before and after boiling.
a) Which water sample is likely to be soft? Explain.
(b) Name the cause of change in the volume of soap solution used in sample III 
