mod quangcuong347 giúp em với 1.Viết phương trình hóa học thực hiện chuỗi chuyển hóa sau: a. CaCO3 → CaO → Ca(OH)2 → CaCO3 → CaSO4 b.CaO → CaCO3→ CaO → Ca(OH)2 → CaCO3→ CaSO4 c. FeS2 →SO2 → Na2SO3 → Na2SO4 → NaCl. d.S →SO2 → SO3 → H2SO4 → Na2SO4 → BaSO4 e.SO2 → Na2SO3 → NaCl → NaOH → Na2CO3. f. Mg(NO3)2→ Mg(OH)2 →MgO→ MgSO4 → MgCl2 g.Cu→ CuO →CuCl2→ Cu(OH)2 →CuO→ Cu→ CuSO4. h.Fe →FeCl2 →Fe(NO3)2→ Fe(OH)2 → FeO → FeSO4. i.Fe → FeCl3 →Fe(OH)3→ Fe2O3 →Fe2(SO4)3 → FeCl3. k.Al →AlCl3 → Al(OH)3 → Al2(SO4)3 →Al l.FeCl2 → Fe(OH)2 → Fe(OH)3 → FeCl3 → FeCl2 m.Al2O3 →Al→ AlCl3 → NaCl → NaOH → Cu(OH)2. 2. Bằng phương pháp hóa học hãy nhận biết các dung dịch sau: a.H2SO4,HCl, HNO3 b. NaOH, HCl, Na2SO4, NaNO3 c.Ba(OH)2,Ca(OH)2, NaNO3, NaCl. d.KCl, K2SO4, K2CO3, KNO3. e. H2SO4; HCl; NaOH. f. MgCl2, FeCl3, AlCl3

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Conditional sentences /TYPE 2 (if + past simple / would +infinitive) 2. Complete the sentences with the verbs in brackets in the correct forms. 1. What --------------------(you /do) if you --------------------(witness ) a car accident? 2. I ----------------------(go) to see the doctor if I -------------------(be) you. 3. If the government -----------------------(find ) good solutions , there-------------------------(not/ be ) so much unemployment. 4. If I ----------------------(be ) you , I -----------------------(not/ quit ) my job! 5. If so many students ---------------------( not / be ) absent for illness, we -------------------------(not / change) the date of the exam. 6. How --------------------------( you/ feel) if you -------------(win ) the lottery? 7. What --------------------------- (your father / do ) if he -----------------(be) fired? 8. If Laura ----------------------(take) part in “The Voice “ , she-------------------------------------( probably / win) !!! 9. If Mum -------------------- (stop) smoking , she ----------------------(feel) much better. 10. Many of us -------------------------(get) better school results if we------------------------(not / spend ) so much time on social networks!! 11. If our maths teacher --------------------(not / work) so much , he --------------------------(be) more relaxed and less strict with us!! 12. If we -----------------------(not/ live) in the capital , our life --------------------------------(be) far less stressful !! 13. If I -----------------(win) the lottery, I ------------------------(buy) a large house in the countryside and I ---------------------(stop) working! 14. If I -------------------------(be) a politician, I ----------------------------(reduce) all the taxes!!! 15. If I ------------------( feel) that tired , I ------------------ (go) on holidays. 16. What ------------------------(you / do) if you --------------------(find) a wallet full of money in the street? 17. We ----------------------( ask) the police to have a look on our house if we ------------------------(leave ) it for a long period. 18. “Mike, if you -----------------------(go) to bed earlier , you -------------------------------(not / feel) so exhausted now!! 19. If you ------------------(make) too much noise in the evening , the neighbours next door ------------------------(complain)! 20. We -------------------(send) our pen friends e-mails if we----------------(know) their addresses!