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16. He actively participated in the game. 17. Mary works hard as a student. 18. My father drives carefully. 19. He cycles quite slowly. 20. That girl performs attractively. 16. He was 17. Mary is 18. My father isn’t 19. He is 20. That girl is
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5 Cân bằng phương trình phản ứng 1) MgCl2 + 2KOH → Mg(OH)2 + 2KCl 2) Cu(OH)2 + 2HCl → CuCl2 + 2H2O 3) Cu(OH)2 + H2SO4 → CuSO4 + 2H2O 4) FeO + 2HCl → FeCl2 + H2O 5) Fe2O3 + 3H2SO4 → Fe2 (SO4)3 + 3H2O 6) Cu(NO3)2 + 2NaOH → Cu(OH)2 + 2NaNO3 7) 4P + 5O2 → 2P2O5 8) N2 + O2 → 2NO 9) 2NO + O2 → 2NO2 10) 4NO2 + O2 + 2H2O → 4HNO3 11) 2SO2 + O2 → 2SO3 12) N2O5 + H2O → 2HNO3 13) Al2(SO4)3 + 6AgNO3 → 2Al(NO3)3 + 3Ag2SO4 14) Al2 (SO4)3 + 6NaOH → 2Al(OH)3 + 3Na2SO4 15) CaO + CO2 → CaCO3 16) CaO + H2O → Ca(OH)2 17) CaCO3 + H2O + CO2 → Ca(HCO3)2 18) 2Na + H3PO4 → Na2HPO4 + H2 19) 6Na + 2H3PO4 → 2Na3PO4 + 3H2 20) 2Na + 2H3PO4 → 2NaH2PO4 + H2 21) 2C2H2 + 5O2 → 4CO2 + 2H2O 22) 2C4H10 + 13O2 → 8CO2 + 10H2O 23) C2H2 + 2Br2 → C2H2Br4 24) 2 C6H5OH + 2Na → 2C6H5ONa + H2 25) CH3COOH+ Na2CO3 → CH3COONa + H2O + CO2 26) CH3COOH + NaOH → CH3COONa + H2O 27) Ca(OH)2 + 2HBr → CaBr2 + 2H2O 28) Ca(OH)2 + 2HCl → CaCl2 + 2H2O 29) Ca(OH)2 + H2SO4 → CaSO4 + 2 H2O 30) Ca(OH)2 + Na2CO3 → CaCO3 + 2NaOH 31) Na2S + H2SO4 → Na2SO4 + H2S 32) Na2S + 2HCl → 2NaCl + H2S

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