Chemistry OCR Higher C4 0.0 / 5 ? ChemistryAtomsThe Periodic TableGCSEOCR Created by: LavleenGillCreated on: 20-03-17 21:01 Mass of a Proton? 1 1 of 31 Charge of a proton? +1 2 of 31 What is protons equal to? The atomic number 3 of 31 Mass of a Neutron? 1 4 of 31 Charge of a Neutron? 0 5 of 31 How to calculate the amount of Neutrons? Mass number - atomic number. 6 of 31 Mass of an Electron? 0 7 of 31 Charge of an Electron? -1 8 of 31 What is the Electrons in an element equal to? The atomic number if its not ion. 9 of 31 What is an isotope? Different number of neutrons. 10 of 31 `What is ionic bonding? (3 things) Transfer of electrons. Involves metal and non-metal. High electrostatic forces. 11 of 31 When can ionic compounds conduct electricity? In solution or when molten because ions are free to move. 12 of 31 What is covalent bonding? (3 things) Sharing electrons. Two non metals. Strong covalent bonds. 13 of 31 Why do simple covalent structures have a low melting point? Due to weak intermolecular forces which take little energy to overcome. 14 of 31 What is metallic bonding? Positive metal ions. De-localised electrons that are free to move. 15 of 31 Why do metals have a really high melting? Strong attraction between metal ions and delocalised electrons. 16 of 31 Why can metals conduct electricity? De-localised electrons can move 17 of 31 What is Group 1 reactivity? (Alkali metals) Increases down the group because distance between nucleus and outer shell electron increases, so attraction decreases - electron is more easily lost. 18 of 31 What happens when you mix a group 1 metal with water? +formula. Forms group 1 metal hydroxide -> hydrogen . Formula: 2K + 2H^2O --> 2KOH + H^2 19 of 31 Group 1 flame test colours? Lithium - Red , Sodium - Orange , Potassium - Lilac. 20 of 31 Group 7 reactivity? (halogens) Decreases down the group because number of electrons increases, which repel other electrons - more difficult to gain an electron. 21 of 31 Group 7 appearances? Chlorine - Pale green gas , Bromine - Orange liquid , Iodine - Purple solid. 22 of 31 What are the properties of transition metals? Catalysts, Coloured Compounds, Malleable (hammer into shape), Ductile (can draw into a wire). 23 of 31 What is the word equation for transition metal carbonates? Metal carbonate -> Metal oxide + Carbon dioxide. 24 of 31 What are the transition metal precipitates when sodium hydroxide is added? Copper - Cu^2+ - Blue , Iron (II) - Fe^2+ - Green , Iron (III) - Fe^3+ - Orange/Brown. 25 of 31 What are the 3 stages in purification? Sedimentation, Filteration, Chlorination. 26 of 31 How purification occurs? Sedimentation of particles - bits drop to the bottom , Filteration of very fine particles using sand , Chlorination - Kills microbes. 27 of 31 Testing for sulfate ions in water? Add barium chloride - positive test = white precipitate 28 of 31 Testing for chloride ions in water? Add silver nitrate - White precipitate 29 of 31 Testing for bromide ions in water? Add silver nitrate - Cream precipitate 30 of 31 Testing for iodide ions in water? Add silver nitrate - Yellow precipitate. 31 of 31
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