A gas company investigates a small leak from a methane pipe. Fig. 1 shows the dot-and-cross arrangement for methane. Dots and crosses represent outer-shell ...
Question 1 Report
A gas company investigates a small leak from a methane pipe. Fig. 1 shows the dot-and-cross arrangement for methane. Dots and crosses represent outer-shell electrons from different atoms.
(a) Complete the formula for methane: C__H4. [1]
(b) What is the number of covalent bonds in one methane molecule? [1]
(c) Give two safety actions the engineer should take if a methane leak is suspected. [2]
(d) Suggest why methane does not conduct electricity. [2]
Answer Details
(a) 1 [1] (b) 4 [1] (c) any two: turn off gas supply [1]; keep away flames/sparks [1]; ventilate the area [1]; contact the gas supplier [1] (d) it has no ions [1]; it has no delocalised/mobile electrons [1]
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