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The complete combustion of butane is represented by a C4H10 + b O2 → c CO2 + d H2O. Which sequence gives a, b, c and d as the smallest whole-number coefficients?
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Iron pyrite is roasted according to FeS2 + O2 → Fe2O3 + SO2. Which is the correctly balanced equation using the smallest whole-number coefficients?
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Sodium thiosulfate reacts with hydrochloric acid as shown: Na2S2O3 + HCl → NaCl + SO2 + S + H2O. Which sequence gives the smallest whole-number coefficients in the order shown?
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Calcium nitride reacts with water according to Ca3N2 + H2O → Ca(OH)2 + NH3. Which sequence gives the coefficients of Ca3N2, H2O, Ca(OH)2 and NH3 after balancing?
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Ammonia is oxidised to nitrogen monoxide and water: NH3 + O2 → NO + H2O. Which is the correctly balanced equation?
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Phosphorus is manufactured using the equation Ca3(PO4)2 + SiO2 + C → P4 + CaSiO3 + CO. Which sequence gives the smallest whole-number coefficients in the order shown?
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In acidic solution, the ionic equation is MnO4− + H+ + Fe2+ → Mn2+ + Fe3+ + H2O. Which sequence gives the smallest whole-number coefficients in the order shown while balancing both atoms and charge?
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Copper reacts with concentrated nitric acid according to Cu + HNO3 → Cu(NO3)2 + NO2 + H2O. Which equation is correctly balanced using the smallest whole-number coefficients?
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The particle models in the figure represent the six substances in reaction A + B → C + D + E + F. Which sequence gives the smallest whole-number coefficients for A, B, C, D, E and F, respectively?
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The molecular models in the figure show reaction A + B → C + D. Which sequence gives the smallest whole-number coefficients for A, B, C and D, respectively?
