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0 1 This question is about structure and bonding. 0 1 . 1 FIGURE 1 shows part of the structure of calcium oxide (CaO). 0 2 . 9 Explain why fluorine is a gas at room temperature. Use the following words in your answer: metal

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2009618- QUESTIONSHEET 1 Calcium carbonate reacts with (c) Explain why the line on your graph does ..IGCSE CHEMISTRY RATES OF Explain why calcium is vital to bone health Calcium helps to makenstrong bones, optimizes bone mass, and can help to minimize the risk of osteoporosis.

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CHEMISTRY 0620/31

3 The table shows some properties of the Group I metals. boiling point /ºC melting point /ºC density in g/cm3 metal lithium 0.53 181 1342 sodium 98 883 potassium 0.86 63 760 rubidium 1.53 39 686 caesium 29 669 (a) (i) Describe the trend in boiling points of the Group I metals.

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