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4. Practice: Chemical reactions are generally classified into five groups, defined below. Balance each equation, using the Gizmo for help. The only thing you are adding is coefficients. Example: CH4 + 2O2 ? CO2 + 2H2O Be sure to use a different font color so it shows up. Hint...sometimes the equation might already be balanced and not need any coefficients. You can just leave those blank. (Hint there are 2 of them below.) Combination (or synthesis) – two or more elements combine to form a compound. 1. H2 + Br2 ? HBr 2. Na2O + H2O ? NaOH 3. H2 + N2 ? NH3 Decomposition – a compound breaks down into elements and/or simpler compounds. 4. MClO3 ? MCl + O2 5. H2O2 ? H2O + O2 6. H2CO3 ? H2O + CO2 Combustion – a fuel reacts with oxygen to release carbon dioxide, water, and heat. 7. CH4(g) + O2 ? CO2 + H2O 8. C3H8 + O2 ? CO2 + H2O 9. C10H8 + O2 ? CO2 + H2O Single replacement – an element replaces another element in a compound. 10. HCl + Zn ? ZnCl2 + H2 11. F2 + FeI3 ? I2 + FeF3 12. Zn + Fe(NO3)2 ? Zn(NO3)2 + Fe Double replacement – two compounds switch parts with one another. 13. CuCl2 + AgNO3 ? Cu(NO3)2 + AgCl 14. K3PO4 + SrCl2 ? Sr3(PO4)2 + KCl 15. Fe(NO3)2 + Na3PO4 ? Fe3(PO4)2 + NaNO3

          4. Practice: Chemical reactions are generally classified into five groups, defined below. Balance each equation, using the Gizmo for help. The only thing you are adding is coefficients. Example: CH4 + 2O2 ? CO2 + 2H2O Be sure to use a different font color so it shows up. Hint...sometimes the equation might already be balanced and not need any coefficients. You can just leave those blank. (Hint there are 2 of them below.) Combination (or synthesis) – two or more elements combine to form a compound. 1. H2 + Br2 ? HBr 2. Na2O + H2O ? NaOH 3. H2 + N2 ? NH3 Decomposition – a compound breaks down into elements and/or simpler compounds. 4. MClO3 ? MCl + O2 5. H2O2 ? H2O + O2 6. H2CO3 ? H2O + CO2 Combustion – a fuel reacts with oxygen to release carbon dioxide, water, and heat. 7. CH4(g) + O2 ? CO2 + H2O 8. C3H8 + O2 ? CO2 + H2O 9. C10H8 + O2 ? CO2 + H2O Single replacement – an element replaces another element in a compound. 10. HCl + Zn ? ZnCl2 + H2 11. F2 + FeI3 ? I2 + FeF3 12. Zn + Fe(NO3)2 ? Zn(NO3)2 + Fe Double replacement – two compounds switch parts with one another. 13. CuCl2 + AgNO3 ? Cu(NO3)2 + AgCl 14. K3PO4 + SrCl2 ? Sr3(PO4)2 + KCl 15. Fe(NO3)2 + Na3PO4 ? Fe3(PO4)2 + NaNO3

4. Practice: Chemical reactions are generally classified into five groups, defined below. Balance each equation, using the Gizmo for help. The only thing you are adding is coefficients. Example: CH4 + 2O2 ? CO2 + 2H2O Be sure to use a different font color so it shows up. Hint...sometimes the equation might already be balanced and not need any coefficients. You can just leave those blank. (Hint there are 2 of them below.) Combination (or synthesis) – two or more elements combine to form a compound. 1. H2 + Br2 ? HBr 2. Na2O + H2O ? NaOH 3. H2 + N2 ? NH3 Decomposition – a compound breaks down into elements and/or simpler compounds. 4. MClO3 ? MCl + O2 5. H2O2 ? H2O + O2 6. H2CO3 ? H2O + CO2 Combustion – a fuel reacts with oxygen to release carbon dioxide, water, and heat. 7. CH4(g) + O2 ? CO2 + H2O 8. C3H8 + O2 ? CO2 + H2O 9. C10H8 + O2 ? CO2 + H2O Single replacement – an element replaces another element in a compound. 10. HCl + Zn ? ZnCl2 + H2 11. F2 + FeI3 ? I2 + FeF3 12. Zn + Fe(NO3)2 ? Zn(NO3)2 + Fe Double replacement – two compounds switch parts with one another. 13. CuCl2 + AgNO3 ? Cu(NO3)2 + AgCl 14. K3PO4 + SrCl2 ? Sr3(PO4)2 + KCl 15. Fe(NO3)2 + Na3PO4 ? Fe3(PO4)2 + NaNO3

Added by Raquel C.

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