AQA Jan 2011 Paper 1 Q1

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section a answer all questions in the spaces provided do not write outside the box a water can be found as ice water and steam the following diagram shows the arrangement of some of the water molecules in a crystal of ice with reference to the structure shown above give one reason why ice is less dense than water mark b water and methane have similar relative molecular masses and both contain the element hydrogen the table below gives some information about water and methane mr melting point k h o ch b i state the strongest type of intermolecular force holding the water molecules together in the ice crystal mark b ii state the strongest type of intermolecular force in methane mark wmp jan chem do not write outside the box b iii give one reason why the melting point of ice is higher than the melting point of methane mark c a molecule of h o can react with an h ion to form an h o ion c i draw and name the shape of the h o ion include any lone pairs of electrons shape of the h o ion name of shape marks c ii suggest a value for the bond angle in the h o ion mark c iii identify one molecule with the same number of atoms the same number of electrons and the same shape as the h o ion mark d water can also form the hydroxide ion state the number of lone pairs of electrons in the hydroxide ion mark turn over wmp jan chem

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