Third 4.5 Weeks Chemistry Test

THIRD 4.5 WEEKS CHEMISTRY TEST

1. Does CaCl2 or Cl2 have the highest melting point?

2. Explain why.

A bond formed when atoms share pairs of electrons is a ______.
H-H has a bond energy of 436 kJ/mol. H-C has a bond energy of 418 kJ/mol. Which bond has a longer bond length?

Describe the bond character for the following bonds. Use the electronegativity values that are given: Na=0.9, F=4.0, C=2.5, H=2.1, P=2.1, O=3.5

Na-F
C-H

For the following, list the oxidation numbers for the following elements in the molecular compounds.

Fe2O3
H2O

Name the following compounds both ways:

9,10. P2O5

11,12. SF6

For the following, draw the Lewis structure:

13,14.. Carbon monoxide.

15,16,17.. Sulfur trioxide. Consider resonance.

18,19,20. Chemical analysis of citric acid shows that it contains 37.51% C, 4.20% H, and 58.29% O. What is its empirical formula?

21,22. What is the molecular formula of paradichlorobenzene, and ingredient in moth balls that has a molar mass of 147.00 g/mol and an empirical formula of C3ClH2 ?

23,24.. Determine the shape and appropriate bond angles for a compound that has a central nitrogen atom with a double bond to an oxygen atom and single bonds to a second oxygen atom and a chlorine atom.

25,26,27. Write the chemical formula, structural formula, and organic structure for nonane.

28,29,30. Threonine is an amino acid used in protein synthesis . Identify the functional groups in threonine and determine the molecular formula and molar mass.

Translate the following word equations into balanced formula equations.

31. nitrogen dioxide + water  nitric acid + nitrogen monoxide

32. silicon tetrachloride + water  silicon dioxide + hydrochloric acid

Balance the following equations:

33. CaH2 + H2O  Ca(OH)2 + H2

34. Fe + Cl2  FeCl3

Answer the following questions for the following reaction:

Al2O3 + 3H2SO4  Al2(SO4)3 + 3H2O

35. How many moles of Al2(SO4)3 would be produced if 6 moles of H2SO4 reacted with an excess of Al2O3?

36. How many moles are required to make 2 moles of H2O?

37,38. If 588.0 moles of Al2O3 react with an excess of H2SO4 how many moles of each of the products will be produced?

39,40. Write the balanced chemical equation for the synthesis of the antacid magnesium oxide from magnesium metal and oxygen gas.

41,42. Write the balanced chemical equation for the synthesis of the pollutant nitrogen dioxide from nitrogen monoxide and oxygen gas.

43,44. Write a balanced chemical equation for the reaction that will occur if the following ingredients are mixed together: Pb (s) , PbCl2 (aq), Zn (s), ZnCl2 (aq)

45. Predict which metal would be the best choice as a container for concentrated acid.

a. Sn b. Mn c. Pt

Predict whether the following reactions are possible:

46. Ni + MgSO4  NiSO4 + Mg

47. 6 Li + Al2SO4  3 Li2SO4 + 2 Al

48. Draw the Lewis structure for Ozone.

49. Draw the Lewis structure for Carbon (II) oxide.

50. Draw the structural formula for diethyl ether.

EXTRA CREDIT:

51. What gives diamond its strength and hardness?

52. Draw the organic structure for nonanol.

53. Draw the organic structure for benzoic acid.

54. Draw the structural formula for a fatty acid with the formula C9H19COOH. (Hint: Not a ring, and it is an organic acid.)

Table 7-7 Activity Series

Li react with Ag

Rb cold water and acids, Pt mostly unreactive

K replacing hydrogen Au

Ba ------

Ca F2

Na Cl2

------Br2

Mg I2

Al reacts with acids or steam, but ------

Mn usually not liquid water, to replace

Zn hydrogen

------

Sn all react with acids, but

Pb not water to replace

H2 hydrogen

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