Chemistry > As Level Question Papers > OCR AS Level Chemistry B (Salters) H033/02 Chemistry in depth QUESTION PAPER May 2022 – Afternoon (All)

OCR AS Level Chemistry B (Salters) H033/02 Chemistry in depth QUESTION PAPER May 2022 – Afternoon

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1 The element magnesium is an important Group 2 metal. Its presence in distant stars has been shown using atomic emission spectra. (a) (i) The atomic emission spectrum of an element shows a series o... f coloured lines on a black background. Describe how the appearance of the absorption spectrum of the element is similar to and different from its emission spectrum. Similar ............................................................................................................................... ........................................................................................................................................... Different ............................................................................................................................. ........................................................................................................................................... [2] (ii) What evidence for the structure of atoms is provided by atomic spectra? ........................................................................................................................................... ...................................................................................................................................... [1] (b) Ionisation enthalpies have also been used to develop theories about atomic structure. (i) Write an equation for the reaction that represents the first ionisation enthalpy of magnesium. Include state symbols. [2] (ii) The first ionisation enthalpies of the elements of Period 3 show a general increase across the period. Explain this increase. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [3] 3 [Show More]

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