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“atm”单位的废除,研究化学反应平衡常数,首先要研究K,K与标准态选择有关,教科书中对此并未统一,使学生学习显得混乱。为此,笔者从标准态选择入手,讨论了K与其它实验平衡常数的关系。 相似文献
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《中学生数理化(高中版)》2016,(8)
<正>一、平衡常数K的类型和定义1.实验平衡常数(又称经验平衡常数)。实验平衡常数是通过物理方法或化学方法测定后经计算得到的。实验证明:对于任何可逆反应aA+bB===gG+hH。在一定温度下达到平衡时,各生成物平衡浓度系数次幂的乘积与反应物平衡浓度系数次幂的乘积之 相似文献
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电导法是测定弱电解质平衡常数多种方法中的一种,它具有实验过程简单、实验结果准确等特点。本文用电导法测定了醋酸在298K的离解平衡常数,实验值为1.70×10-5,与理论值1.75×10-5接近。 相似文献
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基于2021年山东高考题第20题中物质的量分数平衡常数Kx的提出,剖析了一个可逆反应分别在恒温恒容、恒温恒压条件时,Kx与浓度平衡常数Kc、压强平衡常数Kp的关联,并由此得出Kx的影响因素。在具体问题情境下,选择合适的商(Q)与平衡常数(K)解决问题,有助于提升学生分析问题、解决问题的能力,发展变化观念与平衡思想的素养。 相似文献
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本文通过模拟经验平衡常数K与标准平衡常数K^σ，标准吉氏自由能变化△G^σ，标准焓变△H^σ及标准熵变△S^σ等热力学关系，导出了理想溶液反应及理想气体反应的ACT热力学表达式。 相似文献
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一、理解化学平衡常数的含义,能够利用平衡常数进行简单的计算
化学平衡常数是指在一定温度下,当一个可逆反应达到平衡时生成物浓度系数次幂之积与反应物浓度系数次幂之积的比值,又简称为平衡常数,符号为K．如化学反应。 相似文献
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本文根据氧化还原反应的一般理论模式,(1)讨论了在一般准确度条件下的准确滴定条件,即对平衡常数K的要求;(2)推导出终点误差(TE)与△E(计量点电位Esp与终点电位Eep的差)和平衡常数K的关系式。在此基础上讨论了在一般准确度条件下,K所必须满足的准确滴定条件与△E、n(电子转移数)之间的关系及当n_1≠n_2、Esp不在实跃范围中部时,Eep在计量点前、后K所必须满足条件的差异,为指示剂的选择提供了依据。 相似文献
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计算了以水为溶剂,过氧化氢氧化苯酚羟基化合成苯二酚的反应体系的反应焓变、吉布斯自由能变和反应的平衡常数。结果表明,生成邻苯二酚、对苯二酚的反应均为放热反应;反应在298K-368K范围内是热力学上可自发进行的反应;反应的平衡常数很大,理论上反应的平衡转化率很大。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献