Vietnam: What are xem bóng đá trực tiếp trên youtube newest 2nd mid-semester question papers and answers for 12th-grade Chemistry in xem bóng đá trực tiếp trên youtube 2024-2025 school year?
What are xem bóng đá trực tiếp trên youtube newest 2nd mid-semester question papers and answers for 12th-grade Chemistryin xem bóng đá trực tiếp trên youtube 2024-2025 school year?
Students may refer to xem bóng đá trực tiếp trên youtube followingnewest 2nd mid-semester question papers and answersfor 12th-grade Chemistryin xem bóng đá trực tiếp trên youtube 2024-2025 school year:
Department of Education and Training .....
2nd mid-semester question papersfor 12th-grade Chemistry
Subject:12th-grade Chemistry
Time: 45 minutes
Given xem bóng đá trực tiếp trên youtube atomic mass of some elements: H = 1, C =12, N = 14, O = 16, Na = 23, Mg = 24, S = 32, Cl = 35.5, K = 39, Ca = 40, Ba = 137, Cu = 64, Ag = 108.
Question 1: Which of xem bóng đá trực tiếp trên youtube following chemical equations can only be performed by electrolysis?
Question 2: Add 200 ml of 1M NaOH solution to 120 ml of 1M Ca(HCO3)2 solution, obtaining a grams of solid substance. xem bóng đá trực tiếp trên youtube value of a is closest to which of xem bóng đá trực tiếp trên youtube following values?
A. 11.8.
B. 23.5.
C. 19.7.
D. 9.7.
Question 3: Add 100 ml of 0.3M Ba(OH)2 solution to 50 ml of Al2(SO4)3 xM solution, resulting in 8.55 grams of precipitate. Then, add an additional 100 ml of 0.4M Ba(OH)2 solution to xem bóng đá trực tiếp trên youtube reaction container, resulting in 18.8475 grams of precipitate. xem bóng đá trực tiếp trên youtube value of x is
A. 0.45.
B. 0.5.
C. 0.3.
D. 0.6.
Question 4: Add 3.8 grams of a salt mixture M2CO3 and MHCO3 (M is an alkali metal) to an excess 2M H2SO4 solution, releasing 0.496 liters of gas (at standard conditions). M is
A. K.
B. Li.
C. Rb.
D. Na.
Question 5: Add m grams of a mixture G consisting of Na, Al, Fe to excess water, obtaining 4.48 liters of gas (at standard conditions). On xem bóng đá trực tiếp trên youtube other hand, add m grams of xem bóng đá trực tiếp trên youtube above G to a surplus NaOH solution, obtaining 7.84 liters of gas (at standard conditions) and solution X, solid Y. Completely dissolve Y in excess HNO3, obtaining 10.08 liters of NO2 (at standard conditions, sole reduction product). xem bóng đá trực tiếp trên youtube value of m is
A. 23.9.
B. 47.8.
C. 16.1.
D. 32.2.
Question 6: Among xem bóng đá trực tiếp trên youtube following statements:
(1) Li has a body-centered cubic lattice structure, used in xem bóng đá trực tiếp trên youtube production of ultralight alloys.
(2) NaOH is used for manufacturing artificial fibers.
(3) CaO dissolves in water without releasing heat, dolomite ore has xem bóng đá trực tiếp trên youtube formula MgCO3.CaCO3.
(4) Heating both temporary and permanent hard water results in a precipitate.
(5) Na2CO3 is applied to treat stomach ailments.
xem bóng đá trực tiếp trên youtube incorrect statements are
A. (1), (2), (5).
B. (3), (4), (5).
C. (1), (2), (4).
D. (3), (5).
Question 7: xem bóng đá trực tiếp trên youtube method of molten electrolysis is used to produce metals
A. of moderate activity like Fe, Zn.
B. of high activity like Ca, Na.
C. all metals like Cu, Na, Fe, Al.
D. of low activity like Ag, Au.
Question 8: Absorb 11.2 liters of CO2 (at standard conditions) into a solution containing only 25.9 grams of Ca(OH)2, obtaining a grams of solid Y. xem bóng đá trực tiếp trên youtube value of a is
A. 15 grams.
B. 10 grams.
C. 20 grams.
D. 35 grams.
Question 9: Which of xem bóng đá trực tiếp trên youtube following substances is used in: medicine (casting), sculpting,...?
A. CaSO4.
B. CaSO4.H2O.
C. CaSO4.2H2O.
D. BaCl2.H2O.
Question 10: Add 50ml of solution X containing: K2SO4 0.2M and Na2CO3 0.2M to an excess BaCl2 solution, obtaining a grams of solid Y. xem bóng đá trực tiếp trên youtube value of a is closest to which of xem bóng đá trực tiếp trên youtube following values?
A. 4.15 grams.
B. 2.93 grams.
C. 3.4 grams.
D. 3.9 grams.
Question 11: To reduce Fe3+ ions in Fe2(SO4)3 solution, which metal can be used
A. Mg.
B. Ba.
C. Na.
D. Ag.
Question 12: Which substance undergoes both thermal decomposition and possesses amphoteric properties
A. Al2O3.
B. CaCO3.
C. Na2CO3.
D. NaHCO3.
Question 13: Impure Ag containing impurities of Cu. Which reagent can be used to remove Cu to obtain pure Ag?
A. Excess HCl solution.
B. Concentrated, hot excess HNO3.
C. Limited AgNO3 solution.
D. Excess AgNO3 solution.
Question 14: When electrolyzing a CuSO4 solution (with inert electrodes), at xem bóng đá trực tiếp trên youtube anode (A) occurs
Question 15: Find xem bóng đá trực tiếp trên youtube wrong statement?
Question 16: xem bóng đá trực tiếp trên youtube substance used to soften all types of hard water is
A. Na2CO3 and CaO (quicklime).
B. Na2CO3 and Ca(OH)2 (slaked lime).
C. Na2CO3 and Na3PO4.
D. NaOH (caustic soda) and Ca(OH)2.
Question 17: Heating 200 grams of a mixture X consisting of Na2CO3 and NaHCO3 until xem bóng đá trực tiếp trên youtube mass is constant, reducing xem bóng đá trực tiếp trên youtube solid mass by 62 grams. xem bóng đá trực tiếp trên youtube mass percentages of each substance in X are respectively
A. 37% and 63%.
B. 21% and 79%.
C. 42% and 58%.
D. 16% and 84%.
Question 18: A correct statement about xem bóng đá trực tiếp trên youtube application of alkali metals and metal compounds of group IA is
A. NaOH is used to refine aluminum ore.
B. Li is used for manufacturing solar cells.
C. Cs is used to produce ultralight alloys.
D. Na2CO3 is used for soap making.
Question 19: Which of xem bóng đá trực tiếp trên youtube following reactions does not occur under normal conditions?
A. CaO + H2O.
B. Al + NaOH solution.
C. Be + H2O.
D. Ba + H2O.
Question 20: Add 17.04 grams of a mixture X consisting of Ca, MgO, Na2O completely reacting with 360 ml of 2M HCl solution (just enough) obtaining solution Y. xem bóng đá trực tiếp trên youtube mass (grams) of NaCl present in Y is
A. 4.68.
B. 8.775.
C. 15.21.
D. 14.04.
Question 21: Among xem bóng đá trực tiếp trên youtube following metals: Na, Mg, Be, Fe, Ba, K, Sr, Ca. xem bóng đá trực tiếp trên youtube number of metals that react vigorously with water under normal conditions is
A. 5.
B. 4.
C. 6.
D. 3.
Question 22: Which of xem bóng đá trực tiếp trên youtube following substances is also known as slaked lime?
A. CaOCl2.
B. CaCO3.
C. CaO.
D. Ca(OH)2.
Question 23: Salt X when dissolved in water forms a neutral medium solution, X could be
A. Na2CO3.
B. NaCl.
C. Ca(HCO3)2.
D. KHSO4.
Question 24: Pass excess CO gas through mixture X consisting of: CuO, Fe2O3, Al2O3, MgO heated until completely reacted, obtaining solid mixture Y. Y consists of
A. Cu, Fe, Al, MgO.
B. Cu, Fe, Al2O3, MgO.
C. Cu, Fe2O3, Al2O3, MgO.
D. Cu, Fe, Al, Mg.
Question 25: Select xem bóng đá trực tiếp trên youtube correct statement?
A. In industry, water bleaching is produced by electrolysis of NaOH solution.
B. In industry, Al is produced by electrolysis of molten AlCl3.
C. Carbonate salts of alkali and alkaline earth metals are decomposed by heat.
D. In industry, NaOH is produced by electrolysis of saturated brine with a diaphragm.
Question 26: xem bóng đá trực tiếp trên youtube reaction explaining xem bóng đá trực tiếp trên youtube erosion of limestone by rainwater (containing CO2) is
A. CaCO3 + CO2 + H2O ⇌ Ca(HCO3)2.
B. Ca(HCO3)2 → CaCO3 + CO2 + H2O.
C. CaCO3 + CO2 + H2O → Ca(HCO3)2.
D. CaO + H2O → Ca(OH)2.
Question 27: Heat mixture G consisting of: 7.2 grams of Mg and 4.8 grams of S in a sealed container (without air). After a while, obtaining solid X. Add X to an excess HCl solution obtaining gas mixture Y and solid Z. Completely combust Y and Z (with excess O2) then pass xem bóng đá trực tiếp trên youtube entire combustion product slowly through excess limewater noting xem bóng đá trực tiếp trên youtube change in solution mass is
A. decreased by 5.1 grams.
B. increased by 8.4 grams.
C. decreased by 3.0 grams.
D. increased by 15 grams.
Question 28: Add 240ml of 2M NaOH to 150 ml of 1M AlCl3 obtaining a grams of solid. xem bóng đá trực tiếp trên youtube value of a is
A. 11.7.
B. 9.36.
C. 12.48.
D. 2.34.
Question 29: Which series of metals can be produced by electrolysis of solutions?
A. Ni, Cu, Fe, Na.
B. Fe, Cu, Mg, Ag.
C. Cu, Ag, Pb, Fe.
D. Mg, Fe, Zn, Na.
Question 30: Among alkali and alkaline earth metals, xem bóng đá trực tiếp trên youtube metal with xem bóng đá trực tiếp trên youtube lowest melting temperature is
A. Cs.
B. Li.
C. Ba.
D. Be.
ANSWERS AND DETAILED SOLUTIONS
Question 1. D
Question 2. A
Question 3. A
Question 4. C
Question 5. C
Question 6. D
(3) is incorrect because CaO dissolves in water with xem bóng đá trực tiếp trên youtube release of significant heat.
(5) is incorrect because NaHCO3 is used to treat excessive stomach acid.
Question 7. B
xem bóng đá trực tiếp trên youtube molten electrolysis method is used to produce metals of high activity such as Na, Ca.
Question 8. C
Question 9. B
Nitered gypsum: CaSO4.H2O is used in medicine (casting), sculpting, etc.
Question 10. A
Question 11. A
Question 12. D
Question 13. D
Question 14. B
Question 15. B
Using just enough lime softens only temporary hard water.
Question 16. C
Question 17. D
Question 18. A
B is incorrect because Cs is used for manufacturing solar cells.
C is incorrect because Li is used for making ultralight alloys.
D is incorrect because NaOH is used for soap making.
Question 19. C
Be does not react with water under normal conditions.
Question 20. D
Question 21. A
Metals that react vigorously with water under normal conditions include: Na, Ba, K, Sr, Ca.
Question 22. D
Slaked lime: Ca(OH)2.
Question 23. B
NaCl is a salt formed from a strong metal and a strong acid radical, so it creates a neutral medium solution when dissolved in water.
Question 24. B
Question 25. D
A is incorrect because, in industry, water bleach is produced by electrolysis of NaCl solution without a diaphragm.
B is incorrect because, in industry, Al is produced by electrolysis of molten Al2O3.
C is incorrect because carbonate salts of alkali metals are not decomposed by heat.
Question 26. C
Question 27. C
Question 28. B
Question 29. C
xem bóng đá trực tiếp trên youtube solution electrolysis method is used to produce metals with moderate and weak reducing properties.
A, B, and D are incorrect because Na, Mg are not produced by xem bóng đá trực tiếp trên youtube solution electrolysis method.
Question 30. A
Among alkali metals and alkaline earth metals, Cs has xem bóng đá trực tiếp trên youtube lowest melting point (29°C).
Note: Information is for reference purposes only!
What are xem bóng đá trực tiếp trên youtube newest 2nd mid-semester question papers and answers for 12th-grade Chemistry in xem bóng đá trực tiếp trên youtube 2024-2025 school year? (Image from xem bóng đá trực tiếp trên youtube Internet)
What are xem bóng đá trực tiếp trên youtube requirements regarding xem bóng đá trực tiếp trên youtube education content for 12th-grade Chemistry in Vietnam?
According to Article 30 of xem bóng đá trực tiếp trên youtubeEducation Law 2019regulating xem bóng đá trực tiếp trên youtube requirements regarding xem bóng đá trực tiếp trên youtube education content for 12th-grade Chemistry in Vietnam:
Requirements on contents and methods of general education
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2. Requirements on xem bóng đá trực tiếp trên youtube contents of general education at each level are regulated as follows:
a) Primary education must guarantee students xem bóng đá trực tiếp trên youtube foundation for comprehensive development of physical and emotional health, social skills, simple and necessary knowledge about nature, society and human being; with social moral awareness; with basic skills in listening, reading, speaking, writing and calculating; with habits of physical exercise and hygiene; and with initial understanding of singing, dancing, music and arts;
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According to xem bóng đá trực tiếp trên youtube applicable general education program, how doesChemistry benefit students in Vietnam?
Under Section 1 of xem bóng đá trực tiếp trên youtube General Education Program forChemistry issued withCircular 32/2018/TT-BGDDT:
Characteristics of xem bóng đá trực tiếp trên youtube Subject
Chemistry is a science in xem bóng đá trực tiếp trên youtube field of natural sciences, studying xem bóng đá trực tiếp trên youtube composition, structure, properties, and transformations of elements and compounds.
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In xem bóng đá trực tiếp trên youtube general education program, Chemistry is a subject within xem bóng đá trực tiếp trên youtube group of natural sciences at xem bóng đá trực tiếp trên youtube upper secondary level, chosen by students based on their career orientation, interests, and abilities. Chemistry helps students acquire core knowledge of chemistry and apply this knowledge in life, while also interrelating with multiple educational fields. Alongside Mathematics, Physics, Biology, Informatics, and Technology, Chemistry contributes to promoting STEM education, a trend valued in many countries worldwide.
xem bóng đá trực tiếp trên youtube content of Chemistry is designed into topics that ensure xem bóng đá trực tiếp trên youtube consolidation of content strands, development of knowledge and practical skills formed at xem bóng đá trực tiếp trên youtube lower educational level, while also helping students gain deeper understanding of xem bóng đá trực tiếp trên youtube foundational knowledge of chemistry, to serve as a basis for studying, working, and researching.
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Thus,according to xem bóng đá trực tiếp trên youtube new program characteristics, Chemistry helps students acquire core knowledge of chemistry and apply this knowledge in life, while also interrelating with multiple educational fields.
