... cuộc đời.” 5, F + BaCl2 G + H 6, H + AgNO3 AgCl + IBài 4: A 1, Fe2O3 FeCl2 B2, FeS2 B C D B S 3, CuSO 4 B C D Cu“H c không bi t chán, d y ng i không bi t m i”ọ ế...
... dụ 43 . Đáp án C.Phản ứng điều chế SO2 từ quặng, đặt x là khối lợng quặng tính theo lí thuyết :4FeS2 + 11O2 2Fe2O3 + 8SO2 4. 120(g) → 8. 22 ,4 (lÝt)x? ← 4, 48 → x = 4. 120 .4, 48 8.22 ,4 ... KClO 4 Ví dụ 49 .Đốt cháy hoàn toàn 0,05 mol một axit hữu cơ X mạch hở đợc 4, 4 gam CO2 và 1 ,8 gamH2OXác định công thức phân tử của X.A. C3H6O2B. CH2O2C. C2H 4 O2D. C 4 H 8 O 4 Ví ... 46 (g)Ví dụ 48 . Đáp án CĐặt công thức của X là KxClyOzmO = 32.6722 240 0 = 0,96 (g)mrắn = 245 − 0,96 = 1 ,49 (g) → mKali = 1 ,49 .52,35100 = 0, 78 (g)mCl = 1 ,49 − 0, 78 = 0,71 (g)Ta...
... CuSO 4 + H2OB, Cu + ? CuSO 4 + ? + SO2C, C uSO 4 + ? FeSO 4 + ?D, AlCl + ? Al2(SO 4 )3 + ?E , Fe + ? FeCl3 G, Na + ? NaOH + H2H, CuO + ? CuSO 4 + ?I, ? + ? CuSO 4 + ... + ?I, ? + ? CuSO 4 + FeSO 4 K, Fe3O 4 +? Al2O3 + ?L, CH 4 + ? CO2 + ?N, Al + ? Al2O3M, ? + O2 P2O5P, H2O H2 + ?Q KMnO 4 K2MnO 4 + ? + ?Bài 2: 1, FeS2 ... FeS2 + O2 A + B2, A + O2 C 3, C + D Axit E 4, E + Cu F + A + D5 A + D Axit G Bài 3: 1, A + O2 B + C2, B + O2 D3, D + E F 4, D + BaCl2 E + G + H“H c không bi t chán, d y...
... tall and fat. He has short curly hair. He is sociable, generous, kind and helpful. He lives at 8H To Hien Thanh street, Ho Chi Minh city with his mother, father and two younger brother. 11. Mrs Jackson said to Tim “ you should study harder”⇒ Mrs Jackson said to Tim He should study harder12. Mrs Jackson said to Tim “ Please wait for me outside my office”⇒ Mrs Jackson said to Tim to wait for her outside her office13.Teacher said to the students. “Open the books, please.”⇒Teacher said to the students to open the books ... Apperance : tall, fat, short curly hairCharacters : sociable, generous, kind, helpfulAddress : 8H To Hien Thanh street, Ho Chi Minh cityFamily : mother, father and two younger brothers Ôn ... Trai yard from 16 – 19 on November. The person to contact is Nguyen Thanh Phuong of class 9A. 4. “Do you remember me?”⇒Your boy friend asked me to remember him 5. “ Do you miss your old friends?”⇒His...
... nhóm nên : pQ = pR + 8 ( 5 )Từ (3) , (4) , ( 5) ta có : x’pR + (5- x’)( pR + 8) = 48 ⇔ 5pR – 8x’ = 8 ⇔ 88 '5Rxp+= x’ 1 2 3 4 pR3,2 4 ,8 6 ,4 8 ( O ) pQ không xác ... hiđrat bị tách ra : 226 ,4 – 52,1 = 1 74, 3 gamVì số mol hiđrat = số mol muối khan nên : 395, 4 1 74, 32 96 18 2 96R n R=+ + + 44 2,2R-3137,4x +21206 ,4 = 0 ⇔ R = 7,1n − 48 Đề cho R là kim loại ... 1 ,86 lần.l) F chứa 5 ,88 % về khối lượng là H còn lại là của S. F nặng hơn khí hiđro 17 lần.m) G có 3,7% H; 44 ,44 % C; 51 ,86 % O. G có khối lượng mol phân tử bằng Al.n) H có 28, 57% Mg; 14, 285 %...
... (4) ………… we like. It is (5) ……………………….for shops and school and things like that, and the neighbors are very friendly. Test 3I- Choose the correct answer: 1. They’ll arrive………Monday, 14 ... A. your self B. it self C. themselves 3. You should……………… up early. A. gets B. getting C. get 4. I often play soccer ………… Sunday afternoon. A. in B. at C. onII- Put the verbs in the correct ... book at the moment. ……………………………… 3. Mr. Brown used to (swim) when he was young. ……………………………… 4. Kate hates (read) Doremcns. ……………………………… III- Read the passangr and answer the questions:...
... the height of the monument to 93 meters. The statue was completed in 188 4 in France, and then transported to America in 188 6. Tourists can visit the statue from 9.30 am to 5 pm daily expect ... candies. T / F 4. Mrs Robinson wants some marigold T / F *********************** GOOD CLUCK TO YOU*************************ĐÁP ÁN I. ( 3PTS)1. B 2.C 3. C 4. C 5. A 6. B 7. C 8. C 9.B 10. D ... planted along the street.3. A new dress was made for lan yesterday THE TEXT : ENGLISH 8 ( voøng 4 )TIME : 45 MUNITES * ĐỀI. Choose the best answer by circling A, B, C or D ( 3,5pts)1. Would...