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Year 10 Chemistry Revision Can you use numbers of electrons, protons and neutrons to identify atoms and ions? Can you draw electron shell diagrams for atoms? Can you draw electron shell diagrams for ionic compounds? Can you identify o Precipitation reactions o Decomposition reactions o Replacement (displacement) reactions Can you balance equations? Can you name ionic compounds? Can you identify oxidation and reduction reactions? Can you explain a galvanic cell? Can you define exothermic and endothermic reactions in terms of o H o Activation energy Can you identify groups and periods in the periodic table, and use them to predict the ions that will form? Protons Neutrons Electrons Diagram Charge Positive charges: + 12 13 10 Negative charges : - -------------------------- Overall charge This Atom Is - Positive charges: + 8 8 6 Negative charges : - -------------------------- Overall charge This Atom Is - Positive charges: + 18 20 18 Negative charges : - -------------------------- Overall charge This Atom Is - Explain, using electron shell diagrams, showing movement of electrons : 1. When you react sodium with chlorine, you get NaCl 2. When you react sodium with oxygen, you get Na2O 3. When you react magnesium with chlorine, you get MgCl2 4. When you react magnesium with oxygen, you get MgO State whether the following are decomposition reactions, replacement reactions or precipitation reactions and write them as symbol equations (including states) 1. Copper + Zinc chloride → Copper chloride + Zinc 2. Copper nitrate + Iron sulfate → Copper sulfate + Iron nitrate 3. Zinc carbonate → zinc oxide + carbon dioxide 4. Lead iodide + Magnesium hydroxide → Lead hydroxide + Magnesium iodide 5. Copper carbonate → copper oxide + carbon dioxide 6. Nickel + Silver nitrate → silver + nickel nitrate Balance the following chemical equations Na + O2 → Na2O2 N2 + O2 → N2O5 H2 + O2 → H2O2 Na + O2 → Na2O N2 + H2 → NH3 K + B2O3 → K2O + B C6H6 + O2 → CO2 + H2O NH4OH + H3PO4 → (NH4)3PO4 + H2O Examine the following replacement reactions. Identify which metal is being oxidized and which is being reduced. 1. Copper + Zinc chloride → Copper chloride + Zinc 2. Nickel + Silver nitrate → silver + nickel nitrate 3. Gold hydroxide + Magnesium → Gold + Magnesium hydroxide Examine the following galvanic cell. The arrow shows the direction of flow of electrons. 1. In each half cell, describe in words and an equation what is occurring and whether it is oxidation or reduction. 2. Why would the cell not work if both metals were zinc? 3. How would you pick two metals that would give a large current to use in your cell? Fill in the following table showing names and formulae of ionic compounds that would form. NO3- CO32- Cl- O2- + Na Mg2+ NH4+ Al3+ Use a periodic table to write out the formulae of all the ionic compounds that would form from: 1. Group 2 metals and oxygen 2. Group 1 metals and fluorine 3. Group 3 metals and chlorine 4. Aluminium and group 5 non-metals Examine the following energy diagram. Label the following on the diagram: 1. Products 2. Reactants 3. Activation energy 4. H 5. Is this an endothermic or exothermic reaction?
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