试题与答案

溃疡病急性穿孔的典型体征是A.腹式呼吸基本消失B.腹部压痛最显著的部位C.腹肌强直呈

题型:单项选择题

题目:

溃疡病急性穿孔的典型体征是

A.腹式呼吸基本消失
B.腹部压痛最显著的部位
C.腹肌强直呈板状
D.右下腹柔软,无压痛
E.腹胀,肠鸣音消失

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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工业上通常在恒容密闭容器中采用CO(g)和H2 (g)反应催化合成甲醇CH3OH(g):

(1)已知:① 2CO(g) + O2 (g) = 2CO2 (g) ΔH =" -566.0" kJ·mol-1

② 2H2(g) + O2 (g) ="2" H2O (g) ΔH =" -398.0" kJ·mol-1

③2CH3OH(g) +3O2 (g) =2CO2 (g) +4 H2O(g) ΔH =" -1104.0" kJ·mol-1

则CO(g)与H2(g)合成CH3OH(g)的热化学方程式是_______________。

(2)据研究,反应过程中起催化作用的为CuO,反应体系中含少量CO2有利于维持催化剂CuO的量不变,原因是:_______________________________ (用化学方程式表示)。

(3)判断反应达到平衡状态的依据是(填字母序号,下同)__________。

A. 混合气体的密度不变

B. 混合气体的平均相对分子质量不变

C. CH3OH(g)、CO(g)、H2(g)的浓度都不再发生变化

D.生成CH3OH(g)的速率与消耗CO(g)的速率相等

(4)下表所列数据是反应在不同温度下的化学平衡常数(K)。

温度250℃300℃350℃
K2.0410.2500.012
某温度下,将2molCO(g)和6mol H2(g)充入2L的密闭容器中,充分反应后,达到平衡时测得c(CO)=0.5mol/L,则CO(g)的转化率为________,此时的温度为__________。

(5)要提高CO(g)的转化率,可以采取的措施是__________。

A. 升高温度         B. 加入催化剂         C. 增加CO(g)的浓度

D. 加入H2(g)加压    E. 分离出甲醇         F.加入惰性气体加压

(6)一定条件下,在容积相同的三个密闭容器中,按不同方式投入反应物,保持恒温、恒容,测得反应达到平衡时的有关数据如下:

容器
反应物投入量1molCO  2molH21molCH3OH2molCH3OH
平衡数据CH3OH的浓度(mol/L)c 1c 2c 3
反应的能量变化的绝对值(kJ)abc
体系压强(Pa)P1P2P3
反应物转化率α1α2α3
下列说法正确的是__________。

A. 2c1>c3             B.  a+b=129         C.  2p2<p3          D. α13<1

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