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Form 4 Chemistry Paper 1 Sample Revision Questions With Answers

a).State the Gay Lussac’s Law.
b). Ethene reacts with oxygen according to the equation:
$C_2H_(4(g)) + 3O_(2(g)) → 2CO_(2 (g)) + 2H_2O_(g)$
$15.0 cm^3$ of ethene were mixed with $50.0 cm^3$ of oxygen and the mixture was sparked to complete the reaction. If all the volumes were
measured at a pressure of one atmosphere and $25^o C$ . Calculate the volume of the resulting gaseous mixture.

(3m 35s)

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Answer Text:
a).When gases react, they do so in volumes that bear a simple whole number ratio to one another and to the volumes of the product if gaseous, at constant temperature and pressure.
b).1 mole = $15 cm^3$
⸫ $CO_2$ formed = $30 cm^3$ , $H_2 O$ = $30 cm^3$ ,
Resulting gaseous mixture is $60cm^3$ + $5cm^3$ = $65cm^3$