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thuha1404
2 năm trước
Thổi rất chậm 2,24 lít (đktc) một hỗn hợp khí gồm CO và H2 qua một ống sứ đựng hỗn hợp Al O2 3 , CuO , 3 4 Fe O , 2 3 Fe O có khối lượng là 24 gam dư đang được đun nóng. Tính khối lượng chất rắn còn lại trong ống sứ sau khi phản ứng xảy ra.
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Các câu hỏi liên quan

Fill in the gaps with the right forms of the verbs in brackets to complete the following English sentences in Present Tenses: Simple, Continuous or Perfect. 92. I ________________ to Radio City. (be) 93. I think the director ________________ the town. (leave) 94. I ________________ my office. (paint) 95. We ________________ her since she arrived to our city. (know) 96. I ________________ your name. (forget) 97. He ________________ the door. (close) 98. He ________________ it since we left him. (do) 99. I ________________ him my last penny. (give) 100. This order ________________ to many misunderstandings. (lead) 101. He ________________ his name on my book. (write) 102. She ________________ a new umbrella. (buy) 103. He ________________ my exercise over and over. (look) 104. I ________________ those books very cheaply. (buy) 105. He ________________ for two months. (work) 106. She ________________ a new job. (find) 107. He ________________ very well. (speak) 108. The children ________________ the whole pudding. (eat) 109. You ________________ many detective stories. (read) 110. Our team ________________ the first prize. (win) 111. My little daughter ________________ her finger with a knife. (cut) 112. I ________________ (watch) seven films this week! 113. Julie ________________ (be) at the office since 6am. 114. The writer ________________ (deserve) this award for a long time. 115. Anne ________________ all her clothes. At the moment she ________________ a dress for herself. (make, make) 116. What’s that smell? Something ________________ in the kitchen. (burn) 117. I hate living in Seattle because it always ________________ there (RAIN). 118. I am sorry I can't hear what you ________________ because everyone ________________ so loudly (SAY, TALK) 119. Jack ________________ about his adventures in Tibet (CURRENTLY WRITE) 120. ________________ to come over for dinner tonight ? (YOU WANT) 121. The delicious chocolate is ________________ by a firm in Switzerland (MAKE) 122. Look, I ________________ two tickets for the circus (HAVE) 123. Look, I ________________ two tickets for the circus (HOLD)

Fill in the gaps with the right forms of the verbs in brackets to complete the following English sentences in Present Tenses: Simple, Continuous or Perfect. 56. He ________________ (see) the film 'The King's Speech' about six times. 57. We ________________ (paint) our living room. I think it looks a lot better. 58. She ________________ (take) French lessons lately. 59. It ________________ (not/rain) for three hours! Only about one hour. 60. Lucy ________________ (leave) . 61. How many times ________________ (you/visit) Scotland? 62. I ________________ (call) John for hours and hours and he hasn't answered. I'm really angry with him! 63. I ________________ (be) in London for three years. 64. We ________________ (know) James for ages. 65. It's really smelly in here. ________________ (somebody/smoke)? 66. How much petrol ________________ (she/buy)? 67. She ________________ (eat) chocolate all morning, so she feels sick. 68. I ________________ (paint) my house all day, but it's not finished yet. 69. ________________ (you/buy) your train ticket yet? 70. The kitchen is a complete mess! What ________________ (the children/do)? 71. Julie ________________ (learn) to drive for six years! 72. Amanda ________________ (already/have) lunch, so she'll meet us later. 73. How much coffee ________________ (she/drink) this morning? 74. Simon ________________ (write) three books. 75. I ________________ (do) everything I needed to do today! Hurray! 76. It ________________ (not/rain) all summer, so the garden is dead. 77. I ________________ (read) your book. Here it is, thank you. 78. She ________________ (forget) how to get to my house. 79. I ________________ (work) in the garden all day and I need a rest. 80. David feels great these days. He ________________ (get) up early lately. 81. We ________________ (always/hate) rush hour traffic. 82. Recently, I ________________ (study) a lot. My exams are in a few weeks. 83. We ________________ (write) this book for months and months. 84. I ________________ (always/love) chocolate. 85. I ________________ (want) to go back to university for a long time. 86. What's that delicious smell? ________________ (you/cook)? 87. They ________________ London this month. (leave) 88. He ________________ a lot of English papers. (bring) 89. She ________________ me about it. (tell) 90. I ________________ a long letter from father this week. (get) 91. She (just) ________________ ; she will speak to you in a minute. (come)

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