Welcome to your Chemistry - Trakia Uni
1. What is electronegativity?
2. The electrons in a nonpolar covalent bond are:
3. Hydrogen bonding would be seen in a sample of which of the following substances
4. Select the ionic compound
5. Select the substance with intermolecular hydrogen bonds
6. What is the chemical character of \[K_2O\]
7. Which of the series below contains only acids?
8. What is the chemical character of H2CO3?
9. Select the strong electrolyte
10. Which of the series below contains only bases
11. What are the products of reaction Na + HCl →?
12. What is the formula of the compound whose name is Fe (III) carbonate?
13. What is the name of the compound whose formula is \[MgSO_4\] ?
14. pH is a concentration unit used to measure the concentration of
15. What does a catalyst do?
16. Endothermic reaction is
17. Select the correct name for the following compound \[C_6H_5OH\]
18. Which of the following is a methylene group
19. Phenol is a derivative of an
20. Alkenes have the general formula
21. How many σ and π bonds are there in the H-C ≡ C-H
22. Which of the statements given concerning chemical bonding is false?
23. Select the compound with polar covalent bonds between the atoms
24. Select the compound with covalent bonds
25. What is the oxidation number of iron in the compound whose formula is Fe2O3 ?
26. What is the oxidation number of sulfur in the compound whose formula is H2SO3 ?
27. What is the chemical character of \[SO_3\]?
28. What is the chemical character of \[Al_2O_3\]?
29. Which of the series below contains only metals ?
30. Which of the series below contains only nonmetals ?
31. What is the chemical character of \[Al(OH)_3\] ?
32. What is the product of reaction \[Na + H_2\] →?
33. What are the products of reaction \[Zn + CuSO_4\] ?
34. What is the product of reaction \[K + Cl_2\] ?
35. Which of the following does NaOH react with
36. What is the formula of the compound whose name is aluminum sulfate ?
37. Which statement is correct?
38. Which statement is correct?
39. Which one of the following changes would cause the system below to shift left?
Consider the following equilibrium system
CaCO3(s) CaO(s) + CO(g)
40. Select the name of the compound shown below
41. The correct systematic name of the hydrocarbon with the condensed structural formula is
42. The general formula of an alkane is
43. Compounds with the \[– OH\] group attached to a saturated alkane – like carbon are known as
44. Acetone is prepared by oxidation of
45. Ethanal is prepared by oxidation of
46. The systematic name for acetone is
47. This amino acid is called
48. What type of covalent bonds link the amino acids in a protein?
49. The peptide bond is formed by reaction between
50. Carbohydrates may contain the functional groups
51. The disaccharide sucrose is composed of the mono saccharides is composed of the mono saccharides
52. Which of the following substance is a pentose?
53. Which two mono saccharides will be formed by hydrolytic cleavage of sucrose?
54. What is electronegativity?
55. The electrons in a nonpolar covalent bond are
56. Hydrogen bonding would be seen in a sample of which of the following substances
57. Select the ionic compound
58. What is the chemical character of \[K_2O\]?
59. What is the chemical character of \[SO_3\]?
60. Which of the series below contains only acids?
61. What is the chemical character of \[H_2CO_3]\?
62. Which of the series below contains only bases
63. What are the products of reaction Na + HCl →?
64. What is the formula of the compound whose name is Fe (III) carbonate?
65. What are the products of reaction \[Zn + CuSO_4\]?
66. What is the product of reaction \[K + Cl_2\]?
67. Which of the following does NaOH react with:
68. What is the formula of the compound whose name is aluminum sulfate?
69. Which statement is correct?
70. Which statement is correct?
71. Select one strong acid among the following
72. Oxidation of aldehydes with Tollens' reagent
73. Select the name of the given compound
74. The correct systematic name of the hydrocarbon with the condensed structural formula is:
75. The general formula of an alkane is
76. The substance with formula \[C_6H_{12}\] is called:
77. Compounds with the – OH group attached to a saturated alkane – like carbon are known as
78. Express the esterification reaction:
79. Ethanal is prepared by oxidation of
80. The systematic name for acetone is
81. This amino acid is called
82. What type of covalent bonds link the amino acids in a protein?
83. The peptide bond is formed by reaction between
84. Write the structures of the following compounds:
85. The disaccharide sucrose is composed of the mono saccharides
86. Which of the following substance is a pentose?
87. Which two mono saccharides will be formed by hydrolytic cleavage of sucrose?
88. Which of the following has a positive charge? onn (d) electron
89. Rutherford carried out experiments in which a beam of alpha particles was directed at a thin piece of metal foil. From these experiments he concluded that:
90. The neutral atoms of all of the isotopes of the same element have
91. What is the atomic weight of a hypothetical element consisting of two isotopes, one with mass = 64.23 amu (26.0%), and one with mass = 65.32 amu?
92. Which of the responses contains all the statements that are consistent with the Bohr theory of the atom (and no others)?
(1) An electron can remain in a particular orbit as long as it continually absorbs radiation of a definite frequency.
(2) The lowest energy orbits are those closest to the nucleus.
(3) An electron can jump from the K shell (n = 1 major energy level) to the M shell (n = 3 major energy level) by emitting radiation of a definite frequency.
93. The Heisenberg Principle states that _____________.
94. Which statement about the four quantum numbers which describe electrons in atoms is incorrect?
95. Which atomic orbital is spherical in shape? (Note: you should know and be able to recognize the shapes of the s orbital, px, py, and pz orbitals, and dxy, dyz, dxz, dx2-y2 and dz2 orbitals.)
96. When mercuric oxide is heated it breaks down to mercury and oxygen as follows:
HgO → Hg + O2
What is the oxidation number of mercury in mercuric oxide?
97. Oxygen in a compound has an oxidation number of -2. One of the exceptions to this rule is when oxygen
98. What is the oxidation number of chlorine?
99. An electrochemical cell generally consists of a cathode and an anode. Which of the following statements is correct with respect to the cathode?
1oo. When equilibrium is reached inside the two half-cells of the electrochemical cells, what is the net voltage across the electrodes?
101. Which of the following is not a generally used electrolyte in the salt bridges used to connect the two half-cells of an electrochemical cell?
102. Which of the following statements is correct regarding Electrochemical cells?
103. Which of the following factors does not affect the electrode potential of an electrode?
104. Why are the saturated solutions of electrolytes for the salt bridge prepared in agar-agar jelly or gelatin?
105. Which of the following is not a characteristic feature of a salt bridge?
106. Which of the following statements regarding primary cells is false?
107. What is the observation when the opposing external applied potential to an electrochemical cell is greater than the cell’s potential?
108. What is the composition of aqua regia?
109. What is the preferred electrode when it is not allowed to take part in the chemical reaction?
110. A chemical bond formation that involves the complete transfer of electrons between atoms is
111. Formation of a compound through ionic bond ______ the ionization energy of the metal ion.
112. Electron gain enthalpy may be ________
113. Ionic bonds easily form when electron when ionization energy of the metallic atom is _____ comparatively.
