【简答题】(10分)计算填空: (1)(2分)1mol某金属单质与足量的H 2 SO 4 反应,放出1.5molH 2 (标况下)并转化为具有Ne原子的电子层结构的离子,则该金属在周期表的位置 。 (2)(6 分)已知在2L的容器中进行下列可逆反应,各物质的有关数据如下: _ aA (g)+ bB (g) 2C(g) 起始物质的量(mol): ...
【单选题】It's necessary us English every day.
【简答题】(9分 ) (1)已知在 2L的容器中进行下列可逆反应,各物质的有关数据如下: aA (g)+ bB (g) 2C(g) 起始物质的量(mol): 3 2 0 2s末物质的量浓度(mol/L): 0.9 0.8 0.4 则① a = ,b = ; ② 2S内B的反应速率= 。 (2) 1 mol NO 2 和1mol C...
【简答题】(15分)Ⅰ.在一个容积固定为2L的密闭容器中,发生反应:aA (g) + bB(g) pC(g) △H=?反应情况记录如下表: 时间/(min) n(A)/( mol) n(B)/( mol) n(C)/( mol) 0 1 3 0 第2 min 0.8 2.6 0.4 第4 min 0.4 1.8 1.2 第6 min 0.4 1.8 1.2 第8 min 0.1 2.0 1.8 第9 min...
【简答题】A.It's another possible use for seawater. B.It's necessary for growing vegetables in hot climates. C.It's used to cool water used for irrigation. D.It's the primary use for the electricity in the Unit...
【简答题】(1)(6 分)已知在2L的容器中进行下列可逆反应,各物质的有关数据如下 : aA (g)+ bB (g) 2C(g) 起始物质的量(mol): 3 2 0 2s末物质的量浓度(mol/L): 0.9 0.8 0.4 则①a= ,b= ; ②2S内B的反应速率= 。 (2)(4分)由碳棒,铁片和200mL 1.5mol/L的稀硫酸组成的原电池中...
【多选题】导致经济危机爆发的资本主义矛盾及其具体表现有( )
D.
生产无限扩大趋势同劳动人民有支付能力需求相对缩小之间的矛盾
E.
个别企业内部生产有组织性同整个社会生产的无政府状态之间的矛盾
【单选题】Which of the following statements is True?
A.
It's necessary to do regular work in vegetable gardens.
B.
If one's garden is too large, he will fail to plant good vegetables.
C.
Vegetable gardening can help people develop a healthful hobby.
D.
Gardens in cities don't offer as many benefits as those in the countryside.
【简答题】A.It's another possible use for seawater. B.It's necessary for growing vegetables in hot climates. C.It's used for producing electricity in the US. D.It makes people comfortable in hot days.