Complete the sentences. 1 Has the postman been? Yes, (see, come). 2 Have the children gone to school? - id1841427420230607 от SharagaXD 07.06.2023 22:26

Question

Другие предметы: Complete the sentences. 1 Has the postman been? Yes, (see, come). 2 Have the children gone to school? Yes, (see, leave ) 3 Has dad cleaned the car? Yes, (watch, do) 4 Has the telephone engineer repaired the line yet? Yes, (watch, do) 5 Is it 10 o clock yet? Yes, (hear, clock strike ten) 6 Is Tom still here? No, (see, go) 7 Has Tom done his homework? Yes, (watch, do)

SharagaXD · Accepted Answer

а) ZnO + 2HNO3 = Zn(NO3)2 + H2O ZnO + 2H+ + 2NO3− = Zn2+ + 2NO3− + H2O ZnO + 2H + = Zn 2+ + H2O б) 2Al + 3H2SO4(разб) = Al2(SO4)3 + 3H3↑ 2Al0 + 6H+ + 3SO42 − = 2Al3+ + 3SO42 − + 3H20↑ 2Al0 + 6H+ = 2Al3+ + 3H20↑ в) 2HNO3 + CuSO4 = Cu(NO3)2 + H2SO4 2H+ + 2NO3− + Cu2 −+ SO42− = Cu2 −+ 2NO3− + 2H+ + SO42− Реакция не идет так как в результате: 1) не образуется вода, 2)не выделяется газ, и 3) не выпадает осадок. г) 2HCl + FeS = FeCl2 + H2S↑ 2H+ + 2Cl− + FeS = Fe2+ + 2Cl− + H2S↑ 2H+ + FeS = H2↑ д) 3H2SO4...

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