Chemical Changes - Reactivity of metals 0.0 / 5 ? ChemistryChemical patterns and reactivity seriesGCSEAQA Created by: cat.reviserCreated on: 17-01-18 17:58 Oxidation and Reduction Oxidation reactions - a substance often gains oxygen. Reduction reactions - a substance often loses oxygen. Oxidation and reduction always occur together. Metals react with oxygen to form metal oxides. Metal oxides can be reduced by removing oxygen. 1 of 6 The Reactivity Series When metals react, their atoms lose electrons to form positive metal ions. Some metals lose electrons more easily than others. A metal is more reactive if it loses electrons more easily. The reactivity series puts metals in order of reactivity. Metals react with acids to produce metal salts and hydrogen. 2 of 6 The Reactivity Series Potassium, K Sodium, Na Calcium, Ca Magnesium, Mg Aluminium, Al Carbon, C Zinc, Zn Iron, Fe Tin, Sn Lead, Pb Hydrogen, H Copper, Cu Silver, Ag Gold, Au Platinum, Pt 3 of 6 Displacement Reactions Displacement reaction - A more reactive metal will displace a less reactive metal from a solution of its salt. 4 of 6 Extraction of Metals Extraction of a metal depends on how reactive it is. Unreactive metals exist as elements at the Earth's surface. Most metals are found as metal oxides, or as compounds that can be easily changed into metal oxides. Metals that are less reactive than carbon can be extracted from their oxides by heating with carbon. 5 of 6 Losing or Gaining Electrons Not all reduction and oxidation reactions involve oxygen. Scientists use: Oxidation is the loss of electrons. Reduction is the gain of electrons. Oxidation Is Loss Reduction Is Gain OILRIG 6 of 6
Comments
No comments have yet been made