试判断下列反应的ΔrSθm是大于零还是小于零:(1)Zn(s)+2HCl(aq)→ZnCl(aq)+H2(g)(2)CaCO3(s)→CaO(s)+CO2(g)(3)NH3(g)+HCl(g)→NH4Cl(s)(4)CuO(s)+H2(g)→Cu(s)+H2O(l)相关知识点: 试题来源: 解析 (1)ΔrSθm=-285.1J·mol-1·K-1>0(2)ΔrSθm=160.2J·mol-1·K-...
Linear sweep voltammetry was conducted in 0.1 M aq. KOH solution (oxygen saturated). The scan rate and rotation speed were 5 mV s−1 and 1600 r.p.m., respectively. A constant potential of 0.3 V (vs. Ag/AgCl) was applied on the Pt ring. The percentage of HO2 and ...
(1) Zn(s) + 2HCl(aq) ZnCl2(aq) + H2(g) (2) CaCO3(s) CaO(s) + CO2(g) (3) NH3(g) + HCl(g) NH4Cl(s) (4)CuO(s) + H2(g) Cu(s) + H2O(l)相关知识点: 试题来源: 解析 解: 反应(1)、(2) 均有气体产生,为气体分子数增加的反应, r S...
题目不用热力学数据定性判断下列反应的是大于零还是小于零。 (1)Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g) (2)CaCO3(s)→CaO(s)+CO2(g) (3)NH3(g)+HCl(g)→NH4Cl(s) (4)CuO(s)+H2(g)→+Cu(s)+H2O(l) 相关知识点: 试题来源: 解析
A.Zn+2HCl=ZnCl2+H2↑属于放热反应△H<0,气体体积增大△S>0,故A正确;B.2H2+O2=2H2O属于放热反应△H<0,气体体积减小△S<0,故B错误;C.CaCO3=CaO+CO2↑属于吸热反应△H>0,气体体积增大△S>0,故C错误;D.2NH4Cl(s)+Ca(OH)2(s)═2NH
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(1)zn(s)+2hcl(aq)→zncl 2 (aq)+h 2 (g) (2)caco 3 (s)→cao(s)+co 2 (g) (3)nh 3 (g)+hcl(g)→nh 4 cl(s) (4)cuo(s)+h 2 (g)→+cu(s)+h 2 o(l) 查看答案 更多"不用热力学数据定性判断下列反应的是大于零还是小于零. (1)zn(s)+2hcl(aq)→zncl2(aq)+h2(g) (...
Furthermore, a Zn(s)|Zn2+(aq)|Cu(s)system was tested to indicate that the states of the Zn electrode could be observed in real time for charging... CW Pao,JL Chen,JF Lee,... - 《Journal of Synchrotron Radiation》 被引量: 0发表: 2021年 ...
写出下列反应的标准平衡常数表达式。(1) Zn(s)+2H^+(aq)=Zn^(2+)=(aq)+H_2(g)(2) AgCl(s)+2NH_3(aq)=Ag(NH_3)
B. Zn(s)+HCl(aq)═ZnCl2(aq)+H2(g),使用纯锌比粗锌反应速率快 C. 对于反应H2(g)+I2(g)?2HI(g),恒温恒容充入Ne,容器内压强增大,V正、V逆 均增大 D. 对于反应2SO2(g)+O2(g)═2SO3(g)当升高温度V正、V逆 都加快 试题答案 分析 A.固体量的多少不影响化学反应速率;B.原电池能加快化学...