2021 普通化学(长春师范大学) 最新满分章节测试答案

文章目录[隐藏]

【作业】Chapter 1 Stoichiometric relationships Chapter 1 自学作业
Chater3：Periodicity chapter 3 Test
Chapter 4： Chemical bonding and structure chapter 4 Test

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本课程起止时间为:2021-03-05到2021-07-15
本篇答案更新状态:已完结

【作业】Chapter 1 Stoichiometric relationships Chapter 1 自学作业

1、问题:请用英语解释下列概念的含义： 1.chemical compounds 2.stoichiometric coeficients 3.Mixtures 4. homogeneous mixture 5. heterogeneous mixture
评分规则: 【评分指导：概念界定准确，语言使用简洁、准确，通畅。得分标准：每个小题6分，其中概念界定无误得3分，英语语言使用合理得3分
】

2、问题:举例说明 empirical formula and molecular formula 的区别
评分规则: 【要求英文陈述，讲解清晰，举例准确
】

3、问题:give example to show your understanding of following concept1.Reactants can be either limiting or excess, 2.The experimental yield can be different from the theoretical yield.3.Avogadro’s law enables the mole ratio of reacting gases to be determinedfrom volumes of the gases.4.The molar volume of an ideal gas is a constant at specified temperature andpressure.5. The molar concentration of a solution is determined by the amount of soluteand the volume of solution.6. A standard solution is one of known concentration.
评分规则: 【英文作答
】

4、问题: A weak acid has a molar mass of 162 g mol–1. Analysis of a 0.8821 g sample showed the composition by mass is 0.0220 g H, 0.3374 g P, and the remainder was O. Determine its empirical and molecularformulas.
评分规则: 【参考答案请查阅教材27-32页
】

5、问题:An antacid tablet with a mass of 0.300 g and containing NaHCO3 was added to 25.00 cm3 of 0.125 mol dm–3 hydrochloric acid. After the reaction was complete, the excess hydrochloric acid required 3.50 cm3 of 0.200 mol dm–3 NaOH to reach the equivalence point in a titration. Calculate the percentage of NaHCO3 in the tablet.
评分规则: 【答案参考教材51页
】

Chater3：Periodicity chapter 3 Test

1、问题:The first four ionization energies for a particular element are 738, 1450, 7730, and 10 550 kJ mol–1 respectively. Deduce the group number of the element.
选项：
A:1
B:2
C:3
D:4
答案: 【2】

2、问题:Determine the total number of electrons in d orbitals in a single iodine atom.
选项：
A:5
B:10
C:15
D:20
答案: 【20】

3、问题: Identify the excited state (i.e. not a ground state) in the following electron configurations.
选项：
A: [Ne] 3s23p3
B:[Ne] 3s23p34s1
C: [Ne] 3s23p64s1
D: [Ne] 3s23p63d14s2
答案: 【[Ne] 3s23p34s1 】

4、问题: Emission and absorption spectra both provide evidence for
选项：
A:the existence of neutrons
B:the existence of isotopes
C:the existence of atomic energy levels
D:the nuclear model of the atom
答案: 【the existence of atomic energy levels】

5、问题:Identify which of the following provide evidence to support the Bohr model of the hydrogen atom?I The energy of the lines in the emission spectra of atomic hydrogen.II The energy of the missing lines in the absorption spectra of helium as seen from the sun. III The relative intensity of the different spectral lines in the emission spectrum of atomic hydrogen.
选项：
A: I only
B:II only
C:I and II
D:I and III
答案: 【 I only 】

6、问题:Which of the following elements would be expected to be paramagnetic?
选项：
A:Ca B Zn C He D Mn
B:Zn C He D Mn
C:He D Mn
D:Mn
答案: 【Mn】

7、问题:Identify the species which cannot act as a ligand:
选项：
A:H2O B CO C CH4 D Cl–
B:CO C CH4 D Cl–
C:CH4 D Cl–