10-variant Fill in the gap

11-variant

1. How many grams of calcium o*ide and how many (n.sh.l) liters of carbon dio*ide are formed when 0.25 mol of CaCO3 is decomposed?

A) 16gr CaO, 11.2l CO2;* B) 14gr CaO, 5.6 CO2;
C) 28gr CaO, 11.2l CO2; D) 56gr CO, 22.4l CO2
2. Select the row where the amphoteric o*ides are listed?
A) BeO, CaO, MgO; B) BaO, ZnO, K2O;
*C) BeO, ZnO, Fe2O3; D) Na2O, FeO, BaO;
3. Calculate the volume and mass of 0.25 mol of CO2?
A) 22.4l, 11gr; B) 11.2l, 22gr;
C) 5.6l, 22gr;*D) 5.6l, 11gr
4. How many grams of Mg (OH) 2 are formed when 80 g of MgO reacts with water?
*A) 116gr; B) 40gr; C) 50gr; D) 120gr;
5. In 1842, which scientist synthesized aniline from nitrobenzene?
A) Kolbe B) Bersellius
*C) Zinin D) Butlerov
6. ,, Find the line that correctly describes the concept of molecules?
A) A comple* substance consisting of atoms of two elements, one of which is o*ygen;
*B) The smallest particle that retains the substance and its properties;
C) A chemically indivisible particle;
D) Answers A and B give the correct answer;
7. Who first introduced the law of conservation of mass?
A) J. Dalton in 1803,*B) Lamonosov in 1748,
C) Cavendish in 1766 D) J. Priestley in 1774
8. Who introduced the term isomerism to science?
A) Butlerov 1861 *B) Bersellius 1830
C) Bertlo 1854 D) Kekule 1857
9. How many liters (n.sh, l) of gas are released when 250 g of CaCO3 with a 30% additive is decomposed?
A) 22.4 l CO; B) 33.6 l CO2;
*C) 39.2 l CO2; D) 44.8 l CO2;
10. Identify the properties of the substance?
1) density; 2) nuclear charge; 3) electronic floors; 4) boiling and liquefaction temperatures; 5) isotopes; 6) rang; 7) atomic mass; 8) aggregate condition;
A) 2,3,5,7 B) 1,3,4,6 *C) 1,4,6,8 8 D) 1,2,3,4
11. A single * atom is 9.3*10-23 What is the atomic weight of * ?
A)35g/mol B)64g/mol C)27g/mol
* D) 56 g/mol E)31g/mol
12. 2.4*l022 Z molecules weigh 2.4 g. What is the weight of 1 mole of Z molecules?
A)95g/mol *B) 60 g/mol C)74g/mol D)66g/mol
13. 0.05 mol *203 weighs 5.1 g. Calculate the atomic weight of *. (O = 16 g/mol)
*A) 27 g/mol B)34g/mol C)73g/mol D)58g/mol
14.19.2 g of *2H8C03 has 0.4 mol of * atom. Find the atomic weight of * ? A)22g/mol B)26g/mol *C) 14 g/mol D)34g/mol
15. 1.88 grams of *2O contains 1.56 grams of *. Calculate a) the molecular weight of *20 b) the atomic weight of *.
*A) 94 g/mol, 39g/mol B)68g/mol,31g/mol C)85g/mol,35g/mol
D)45g/mol,55g/mol
16. 1.02 g of Y203 contain 0.015 mol of 02 molecules. What is the atomic weight of Y? A)35g B)19g *C) 27g D)45g
17. Molecular weight of *3Y4 is 40 g and 10 % of it by weight is Y. What is the atomic weight of * ?
A)20g *B) 12g C)17g D)23g
18. One mole of a compound contains 1 mol of * and 3 mol of Y and its molecular weight is 80 g. If the atomic weight of * is twice the atomic weight of Y, what arc the atomic weights of * and Y ?
A)*=35,Y=18; *B) *=32, Y=16; C)*=45,Y=26; D)*=44,Y=14
19.When 44 g of *20 are placed in a container which has 44 g of C02, the number of molecules becomes twice the initial number of molecules.What is atomic weight of * A)19g; B)21g; *C) 14g; D)17g;
20. What weight of mercury is found in 1 ton of an ore which is 35 % cinnabar, HgS?
A)271.9kg; B)285kg; C)275.3kg;
*D) 301.7kg;