1. Who fully explains the essence of isomerism? *A butlerov b bersellius

13-variant

1. Determine the amount of substance in 500 g of CuSO4 * 5H2O?

A) 3 mol; B) 4 mol; C) 1 mol; *D) 2 mol;
2. Find the mass gr of 12.04 * 1023 NH3 molecules?
*A) 34 gr; B) 30 gr; C) 28 gr; D) 17 gr;
3. Define the answer given by heterogeneous compounds?
A) sulfuric acid, alcohol, oil;
B) alcohol, pepsi, oil, turbid water;
*C) turbid water, pepsi, oil, milk;
D) vodka, air, oil, sulfuric acid;
4. How many liters (n.sh.l) of gas are released from the reaction of a sufficient amount of HCl acid with 28 g of Fe?
A) 22.4L H2;* B) 11.2L H2;
C) 44.8L H2; D) 5.6L H2;
5. In which row are only pure substances listed?
1) diamond, graphite; 2) oil, ozone; 3) bronze, silver; 4) o*ygen; 5) gold, carbine;
A) 1,2,3 B) 1,3,4 C) 1,3,5 *D) 1,4,5
6. Who introduced the concept of chemical symbol to science?
*A) Berselius 1813; B) Dalton 1803;
C) Lamonosov 1748; D) Kekule 1857
7. What is the most common metal in the Earth's crust?
A) Fe;* B) Al; C) Cu; D) Au;
8. Who determined the bonds between carbon?
A) Kekule and Kolbe *B) Kekule and Cooper
C) Frankled and Kekule D) Zinin and Cooper
9. Find the mass of FeCl3 formed when 1.5 mol of Fe and 1.5 mol of Cl2 react?
*A) 162.5 gr FeCl3; B) 325 gr FeCl3;
C) 81.25 gr FeCl3; D) 120 gr FeCl3;
10. (CN) 2 + 4H2O = HOOC-COOH + 2NH3 Who carried out this reaction?
A) Kekule 1857 B) Bertlo 1845
*C) Vyoller 1824 D) Zinin 1842
11. Atom-molecule-……….-body?
a) * matter b) radius c) object d) oxygen
12. What is composing of atom?
a) * proton, electron, neutron
b) molecule, electron
c) matter, proton d)molecule, neutron
13. Find simple matters?
a) * Na, K, Mg b) CO₂, CO, K c) H₂, Cl₂, NH₂OH d) K, Mg, SO₂
14. How many classes of an organic matter?
a) * salt, NaOH, H2SO4, o*ide b) salt, NaOH
c) hydrogen, o*ygen, salt d)natrium, o*ide
15. What period and gproup is o*ygen placed?
a) 6-group, 3-period b) * 6-group, 2-period
c) 7-group, 2-period d) 6-group, 4-period
16. What is H₂O?
a) simple matter b) *compound matter c) alloy d) clear matter

17. What occurrence which is not change the composition?

a) chemical b) * physical c) biological d) physic-chemical
18. How many states of matters?
a) *gas, liquid, solid b) gas, solid
c) liquid, gas d) solid, liquid
19. What is composition of ozone?
a) *3 oxygen b) 1 oxygen c) 1 oxygen, 1 N d) 2 N, 1 oxygen
20. What is NaO?
a) a salt b) clear matter
c) *oxide d) acid
21. cool
A. sovuq B. issiq C. iliq *D. salqin
22. harvest
A. meva * B. hosil C.don D.urug`
23. corn
A. jo`xorilar B. hosil * C.don D.urug`
24. squirrel
A. tulki B. bo`ri *C. olmaxon D. qush
25. gather
A. yig`ilish *B. yig`moq C. to`plangan D. yig`ilgan
26. nut
A. meva B. don * C. yong`oq D. urug`

27. … wasn’t built in a day .

A) knowledge B) truth *c) Rome d) Canada
28. … is thicker than water . A) blood B) honesty C) absence D) milk
29. … makes the heart grow fonder . A) blood B) honesty * C) absence D) milk
30. … is power .
A) truth * B) knowledge
C) Rome D) milk