- Arts & Culture 5961
- Business & Economics 690
- Computers 317
- Dictionaries & Encyclopedias 82
- Education & Science 76777
- Abstracts 252
- Astrology 4
- Astronomy 1
- Biology 8
- Chemistry 2651
- Coursework 15867
- Culture 9
- Diplomas 411
- Drawings 575
- Ecology 6
- Economy 82
- English 78
- Ethics, Aesthetics 3
- For Education Students 17627
- Foreign Languages 11
- Geography 3
- Geology 1
- History 89
- Maps & Atlases 5
- Mathematics 13871
- Musical Literature 2
- Pedagogics 19
- Philosophy 23
- Physics 14962
- Political Science 5
- Practical Work 101
- Psychology 60
- Religion 4
- Russian and culture of speech 8
- School Textbooks 7
- Sexology 42
- Sociology 9
- Summaries, Cribs 87
- Test Answers 154
- Tests 9246
- Textbooks for Colleges and Universities 32
- Theses 24
- To Help Graduate Students 14
- To Help the Entrant 37
- Vetting 364
- Works 13
- Информатика 10
- Engineering 3060
- Fiction 696
- House, Family & Entertainment 106
- Law 133
- Website Promotion 71
Solution of the variant 17 KR №1 - chemisty Shimanovich
Uploaded: 04.08.2020
Content: Вариант 17.RAR 125,52 kB
200 $ | the discount is | 15% |
show all discounts | ||
1 $ | the discount is | 1% |
Seller will give you a gift certificate in the amount of
Product description
The decision of the test No. 1 of option 17 of the collection of chemistry Shimanovich I.E.
(designed in Microsoft Word)
Tasks:
17. Upon interaction of 3.24 g of a trivalent metal with an acid, 4.03 liters of hydrogen (NU) are released. Calculate the equivalent, molar and atomic mass of the metal.
37. Write down the electronic formulas of atoms of elements with serial numbers 24 and 33, taking into account that the first has a "dip" of one 4s-electron to the 3d-sublevel. What is the maximum spin of d-electrons for atoms of the first and p-electrons for atoms of the second elements?
57. The atomic masses of elements in the periodic table are continuously increasing, while the properties of simple bodies change periodically. How can this be explained? Give a motivated answer.
77. What electrons of the boron atom are involved in the formation of covalent bonds? How does the valence bond method (VS) explain the symmetric triangular shape of the BF3 molecule?
97. The reaction of ammonia combustion is expressed by the thermochemical equation:
4NH3 (g) + 3O2 (g) = 2N2 (g) + 6H20 (g); H = -1530.28 kJ.
Calculate the heat of formation of NH3 (g). Answer: -46.19 kJ / mol.
117. Based on the standard heats of formation and the absolute standard entropies of the corresponding "substances, calculate the Gо298 of the reaction proceeding according to the equation:
C2H4 (g) + 3O2 (g) = 2CO2 (g) + 2H2O (g)
Is this reaction possible under standard conditions? Answer: -1331.21 kJ
137. The equilibrium constant of the homogeneous system N2 + 3H2 2NH3 at a certain temperature is equal to 0.1. The equilibrium concentrations of hydrogen and ammonia are 0.2 and 0.08 mol / l, respectively. Calculate the equilibrium and initial nitrogen concentration. Answer: [N2] p = 8 mol / l; [N2] ref = 8.04 mol / l.
157. Mixed 300 g of a 20% solution and 500 g of a 40% NaCl solution. What is the percentage of the resulting solution? Answer: 32.5%.
177. How many grams of urea (NH2) 2CO should be dissolved in 250 g of water to raise the boiling point by 0.26 °? Ebullioscopic water constant 0.52 °. Answer: 7.5 g
197. Make molecular and ion-molecular equations of interaction reactions in solutions between:
a) H2SO4 and Ba (OH) 2;
b) FeCl3 and NH4OH;
c) CH3COONa and HCl.
217. Make up the ionic-molecular and molecular equations for the hydrolysis of a salt, the solution of which has:
a) alkaline reaction;
b) acid reaction
Feedback
0Period | |||
1 month | 3 months | 12 months | |
0 | 0 | 0 | |
0 | 0 | 0 |