Website môn học: Hóa học vô cơ 1

Write on this Google Doc  or email me at hanv@hus.edu.vn if you have any comment, enquiry or suggestion for CHE1077 Course

Điểm bài kiểm tra số 1

Một số bài tập trắc nghiệm

Lecture Notes

Bài kiểm tra cuối kỳ, Fall 2019

Question 1. Write balanced chemical equations for the following chemical reactions

a)  H2O2 + SO2 + H+ 

b) CO32- + Fe3+ + H2O

c)  F-  + Al3+  

d) B2H6 +  NaH

Question 2. Explain the trends in the boiling point and bond energy of NH3, PH3, AsH3.

Question 3. Using VSEPR, predict the molecular shape of BCl3, SO2Cl2, POCl3, PCl5.

Question 4. Draw the MO diagram of O2. Compare the bond lengths in O2, O2-, and O22-.

Question 5. Explain the trend in the acidity of HOCl, HClO2, HClO3, HClO4.

Question 6. Explain the reverse trends in solubility (g/100 g H2O at 20 °C) of alkaline earth metal hydroxides and sulfates.

Question 7. Describe the bonding in B2H6. Briefly explain the difference in bond lengths of B–Hterminal (1.19 Å) and B–Hbridging (1.31 Å).

Question 8. Explain why white phosphorus is highly reactive.

Question 9. While burning in oxygen, lithium forms the oxide Li2O but sodium forms the peroxide Na2O2. Explain why.

Question 10. CO, Cl2, O3 and H2 can be prepared from HCOOH, HCl, O2 and Zn, respectively. Write balanced chemical equations for each of the processes.

Question 11. Briefly give plausible reason why N(CH3)3 molecule posseses trigonal pyramidal geometries while N(SiH3)3 is trigonal planar.

Question 12. Briefly give plausible reason why the HOH bond angle in H2O is 104.5° while the HSH bond angle in H2S is close to 90°.

-----***-----

Một số bài tập ví dụ

Hydrogen

1. Explain why hydrogen is not placed with the alkali metals in the periodic table.

2. Explain why hydrogen is not placed with the halogens in the periodic table.

3. Explain why hydrogen gas is comparatively unreactive.

4. Is the reaction of dihydrogen with dinitrogen to produce ammonia entropy or enthalpy driven? Do not consult

data tables. Explain your reasoning.

5. Write chemical equations for the reaction between

(a) tungsten(VI) oxide, WO3, and dihydrogen with heating

(b) hydrogen gas and chlorine gas

(c) aluminum metal and dilute hydrochloric acid

6. Write chemical equations for the reaction of

(a) potassium hydrogen carbonate on heating

(b) ethyne, HC‚CH, with dihydrogen

(c) lead(IV) oxide with hydrogen gas on heating

(d) calcium hydride and water

7. What is the major difference between ionic and covalent hydrides in terms of physical properties?

8. Discuss the three types of covalent hydrides. classify the following hydrogen compounds: (a) BaH2, (b) SiH4, (c) NH3, (d) AsH3, (e) PdH0.9, (f) HI

9. Which of the following elements is likely to form an ionic, metallic, or covalent hydride or no stable hydride:

(a) chromium; (b) silver; (c) phosphorus; (d) potassium?

10. Predict which of the following hydrides is a gas or a solid: (a) HCl; (b) NaH. Give your reason in each case.

11. If the hydrogen bond between a pair of hydrogen and fluorine atoms is the strongest hydrogen bond, why does water

have a much higher melting point than hydrogen fluoride?

12. What are the two properties of hydrogen that are crucial to the existence of life?

13. Predict which of the following hydrides is likely to be strongly hydrogen bonded and so deduce the likely phases

of each of the hydrides at room temperature: (a) H2O2; (b) P2H4; (c) N2H4; (d) B2H6.

14. Write balanced chemical equations for the air oxidation of (a) B2H6; (b) PbH4; (c) BiH3.

15. Write balanced chemical equations for three major industrial preparations of hydrogen gas. Propose two different reactions that would be convenient for the preparation of hydrogen in the laboratory

16. Describe the expected physical properties of water in the absence of hydrogen bonding.

17. Which hydrogen bond would you expect to be stronger, S–H…O or O–H…S? Why?