PERIODIC TABLE AND ENERGY 2
- Created by: GummyBear
- Created on: 14-03-17 17:24
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- PERIODIC TABLE AND ENERGY
- GROUP 2
- Magnesium and steam - gas released that when lit has a orange flame (hydrogen), bright white flame and white powder left
- Mg(s) + H2o (g) = MgO (s) +H2 (g)
- Magnesium and hydrochloric acid- fizzing and increase in temperature of test tube, squeaky pop when gas lit (hydrogen), magnesium fully dissolved to colourless solution
- Mg(s) +2HCL(aq) = MgCL2 (aq) + H2 (g)
- Magnesium and Oxygen - very intense bright white light, white powder left of MgO
- 2Mg (s) + O2 (g) = 2MgO (s)
- REACTIVITY INCREASES DOWN GROUP - distance between nucleus and outermost electron increases, electrons added to new shells, increased shielding, nuclear charge increases but is outweighed, outer electrons lode more easily
- GROUP 2 OXIDES - react with water to form hydroxide, sparingly soluble, solubility increases down the group, pH increases
- MgO (s) + H2O (l) = Mg(OH)2 (aq)
- pH 8/9 - medicinal milk and magnesium to neutralise excess stomach acid
- Mg (OH)2(aq) + 2HCL(aq) = MgCL2 (aq) + 2H2O(l)
- pH 8/9 - medicinal milk and magnesium to neutralise excess stomach acid
- CaO(s) + H20(l) = Ca (OH)2 (aq)
- slaked lime to neutralise acidic soil
- CaCO3 = chalk and antacid remedies
- CaCO3(s) + 2HCL(aq) = CaCL2 (aq) + H2O(l) + CO2 (g)
- Ca(OH)2 (aq) + 2HCL (aq) = CaCL2 (aq) + 2H2O (l)
- MgO (s) + H2O (l) = Mg(OH)2 (aq)
- Magnesium and steam - gas released that when lit has a orange flame (hydrogen), bright white flame and white powder left
- OXIDATION NUMBERS
- RULES
- 1 - the sum of all the oxidation numbers a neutral compound is 0
- 2 - the oxidation number of an atom of an element is 0
- 3 - in compounds, Hydrogen is always +1, in metal hydrides it is -1
- 4 - in comp, Oxygen is always -2, in peroxides it is -1
- 5 - the oxidation number of a simple ion is equal to the charge on the ion
- 6 - the sum of oxidation numbers in a molecular ion is equal to the charge on the ion
- OXIDATION = LOSS OF ELECTRONS AND INCREASE IN OXIDATION NUMBER
- REDUCTION = GAIN OF ELECTRONS AND DECREASE IN OXIDATION NUMBER
- Oxidation states
- Use of roman numerals to represent oxidation states - roman numeral is placed after the element it refers to
- RULES
- GROUP 2
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