问题
选择题
下列化学方程式书写正确的是（ ）
A．CO2+Ca（OH）2=CaCO3↓+H2O
B．4Fe+3O2═2Fe2O3
C．C+Fe2O3═Fe+CO2
D．KClO3═KCl+O3↑
答案
A、符合正确化学方程式的各个要求．
B、产物应是四氧化三铁．
C、缺少条件没有配平．
D、缺少条件未配平．
故选A
搜题请搜索小程序“爱下问搜题”
下列化学方程式书写正确的是（ ）
A．CO2+Ca（OH）2=CaCO3↓+H2O
B．4Fe+3O2═2Fe2O3
C．C+Fe2O3═Fe+CO2
D．KClO3═KCl+O3↑
A、符合正确化学方程式的各个要求．
B、产物应是四氧化三铁．
C、缺少条件没有配平．
D、缺少条件未配平．
故选A
| 根据对话内容，选用方框中适当的句子补全对话，其中有一项是多余的。 | |
| A: Hi, Tim. When did you get break from Canada? How was it? B: The day before yesterday. I only visited Montreal and Ottawa.1 ________ A: Which city did you like beller? B: 2 ________ I think ()ttawa is more beautiful than Montreal. A: And what's Montreal like? What did you think of it? B: Moritreal is more interesting than Ottawa.3 ________The things in the shops are cheap and nice. A: Which one has bett'cr nightlife? B: Oh, Montreal for sure.4 ________They say Montreal is the most interesting city in Canada.And I went to the aquarium. A: 5________ B: It was very big and there were a lot of sea animals there. A: It sounds very good. Maybe next year I will go there, too. Bye-bye. B: Bye-bye. | |
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