Chapter 7 and 8 chemistry 0.0 / 5 ? Chemistrychapter 7 and 8ASOCR Created by: sianxxxxxxxxxCreated on: 17-08-20 09:15 What is 1st ionisation energy energy required to remove one e- from each atom in one mole of gaseous atoms of an element to form one mole of gaseous 1+ ions 1 of 23 factors of 1st ionisation energy atomic radius-increase distance between nucleus and outer e- decreases nuclear attraction ; nuclear charge-increase protons in nucleus increase attraction between nucleus and outer e- ; electron shielding-inner e- repel outer e-, decrease attraction 2 of 23 trend across a period 1st ionisation energy increases, nuclear charge increases, same shell so similar shielding, nuclear attraction increases, nuclear radius decreases, 3 of 23 trend down a group 1st ionisation energy decreases, atomic radius increases, more inner shells so shielding increases, nuclear attraction on outer e- decreases 4 of 23 what is peridodicity the trends of the periodic table 5 of 23 what is 2nd ionisation energy energy required to remove one e- from each ion in one mole of gaseous 1+ ions of an element to form one mole of gaseous 2+ ions 6 of 23 what it can predict number of e- in outer shell, group, identity, electrons with the largest IE are the shell closest to the nucleus 7 of 23 trends in group 2 down the group, increase reactivity, decrease IE, solubility increases down group, increase alkalinity 8 of 23 name 3 reactions with group 2 elements react with H20 to form an alkaline hydroxide, react with dilute acids to form salt and H2, react with O2 to form metal oxides 9 of 23 group 2 in redox reactions they are reducing agents 10 of 23 other group 2 reaction observations they are bases and oxides react with water, releasing OH-, hydroxides are slightly soluble in H2O, form solid ppt 11 of 23 uses of group 2 elements Ca(OH)2 is used as lime to increase soil PH, Mg(OH)2 is used in antacids for indigestion 12 of 23 halogens most reactive non metal group, diatomic at room temperature,oxidising agents, gas,gas,liquid,solid,N/A 13 of 23 what is disproportionation redox in which the same element is oxidised and reduced 14 of 23 halogens and water chlorine turns green, bromine turns orange, iodine turns brown 15 of 23 halogens and cyclohexane chlorine turns green, bromine turns orange, iodine turns violet 16 of 23 test for halide ions Ag+(aq) + X-(aq) -> AgX(s) 17 of 23 test for carbonate dilute nitric acid, effervescence, lime water, white precipitate 18 of 23 test for sulfate barium ions, form white precipitate 19 of 23 test for halides silver ions, halide ions, form precipitate, add ammonia to test solubility, chloride turns white, bromide turns cream, iodide turns yellow 20 of 23 non metal properties and structure giant covalent lattice, high mp and bp, insoluble, non conductors of electricity except carbon forms 21 of 23 metallic bonding delocalised e-, strong electrostatic attraction between cations and delocalised e-, fixed position to maintain structure, moile 22 of 23 giant metallic lattice strong metallic bonds, high electrical conductivity both solid and liquid, high mp and bp, dont dissolve, do react 23 of 23
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