Bonding, Structure and Periodicity Assessed hw - AS LEVEL...

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Paddington Academy 1 AS LEVEL CHEMISTRY 1.2.2 BONDING AND STRUCTURE 1.3.1 PERIODICITY ASSESSED HOMEWORK Answer all questions Max 90 marks Name …………………………………………………………….. Mark ……../90 …… .... % Grade ………
Paddington Academy 2 1. Magnesium fluoride, MgF 2 , has ionic bonding. (i) How does ionic bonding hold particles in MgF 2 together? ......................................................................................................................... ......................................................................................................................... [2] (ii) Draw a ' dot-and-cross ’ diagram for magnesium fluoride, MgF 2 . Show outer electron shells only. [2] (iii) Magnesium fluoride is produced when magnesium reacts with fluorine. Complete the half-equations below to show the formation of the ions in magnesium fluoride in this reaction. Mg .................... .................... F 2 .................... .................... [2] (iv) A student found that magnesium fluoride has different electrical conductivities when solid and when dissolved in water. Explain these two observations. ......................................................................................................................... ......................................................................................................................... ......................................................................................................................... ......................................................................................................................... [2] [Total 8 marks]
Paddington Academy 3 2. The ions present in Ca(OH) 2 are Ca 2+ and OH . Draw a ‘dot -and- cross’ diagram of Ca(OH) 2 . Show outer electron shells only. [Total 2 marks] 3. Limestone contains the ionic compound, CaCO 3 . Limestone decomposes when it is heated strongly, forming an ionic compound, CaO and a covalent compound, CO 2 . CaCO 3 (s) CaO(s) CO 2 (g) (a) State what is meant by ionic bonding . ......................................................................................................................... ......................................................................................................................... [1] (b) Draw ‘ dot and cross ’ diagrams to show the bonding in CaO and CO 2 . Show outer electron shells only. CaO CO 2 [3] (c) Complete the electronic configuration in terms of sub-shells for calcium in CaO. 1s 2 .................................................................................................................... [1] [Total 5 marks]
Paddington Academy 4 4. Chemists have developed models for bonding and structure. These models are used to explain different properties of metals and non-metals. (i) Draw a labelled diagram to show the currently accepted model for metallic bonding . [2] (ii) What feature of this model allows metals to conduct electricity? ......................................................................................................................... ......................................................................................................................... [1] [Total 3 marks] 5. Fluorine, F 2 , has covalent bonding. (i) State what is meant by a covalent bond. ......................................................................................................................... ......................................................................................................................... [2] (ii) Draw a ' dot-and-cross ' diagram to show the covalent bonding in fluorine. Show outer electron shells only.

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