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SCH3U
1.
Review for Periodic Table and Reactions
October 5, 2010
An unknown gas was burned in oxygen to produce nitrogen gas and water vapour. Was
the unknown gas an element? Explain.
2. Classify each of the following as a physical or chemical change. Briefly justify your
answer.
a)
b)
c)
d)
e)
f)
g)
fermenting of grapes
formation of snowflakes
burning of gasoline
compressing of garbage
baking bread
carving wood
frying an egg
h)
i)
j)
k)
l)
m)
rusting of iron
a tree growing
a candle giving off light
digestion of food
ice melting on a hot stove
souring of milk
3. When a copper wire is heated in the presence of oxygen, a black substance is formed. Is
the black substance likely to be an element, a mixture or a compound? Explain.
4. For an ion of sulfur-32 that has a charge of 2-, state the following:
a) the atomic number
b) the mass number
d) the number of neutrons
c) the number of protons
e) the number of electrons
5. Suppose that you were presented with a sample of the element strontium (atomic number
38).
a) Predict three physical properties that would be demonstrated by strontium.
b) Compare the chemical reactivity of strontrium and barium.
Justify your answer with specific reference to atomic theory.
6. Select the answer to each question from the following key:
i)
neutron
ii) proton
iii) atom
iv)
electron
v) molecule
a) The one with the smallest mass
b) A particle which helped explain discrepancies in atomic mass and led to the
discovery of isotopes
c) The smallest part of an atom
SCH3U
Review for Periodic Table and Reactions
October 5, 2010
7. Draw a Bohr diagram showing all the particles in each of the following atoms:
a)
23
b)
Na
11
20
c)
O
8
9
9
Be
8. Complete the following chart:
Element
170
Atomic
Number
Mass
Number
Number of
Protons
Number of
Electrons
Number of
Neutrons
Hf
72
85
Kr
36
38
19
K
9. The oxygen atom contains
valence electrons.
10. The calcium atom is found is what family?
11. The atomic number for phosphorus is
12. The zinc atom has
.
protons.
13. Fill in the missing items in the following chart:
Complete
Isotope Symbol
39
Mass
Number
Atomic
Number
K+1 ion
19
Si atom
28
Kr atom
84
14
36
Total
number
of neutrons
Number of electrons in
the outermost energy
level
SCH3U
Review for Periodic Table and Reactions
October 5, 2010
14. Complete the following chart
Symbol
73
Atomic
Number
Mass
Number
Number of
Protons
Number of
Neutrons
Number of
Electrons
Ge
32
125
51
37
28
52
31
15. Use the periodic table to identify each of the following:
a) an element which has 5 electrons in each atom
b) an element which has 5 electrons in its outer energy level
c) an element for which the second energy level is completely filled
d) an element which forms ions by gaining only one electron
e) how many elements are there in the sixth period?
f) the element which has the most metallic properties
Multiple Choice
Answer the following questions by circling the correct response on the answer sheet provided. (1 mark each)
16. The subatomic particle that has the smallest mass is the
a.electron
b.proton
c. neutron
d.nucleus
17. The atomic mass of barium is due to the number of
a. neutrons and electrons in the nucleus
b. electrons in the nucleus
c. protons and neutrons in the nucleus
d. protons and electrons in the atom
18. Choose the pair of elements that will form a compound with the most ionic character
a. Li & O b. C & O c. F & F d. Cl & Br
19. In the alkali metals group, as the atomic number increases
a. the electronegativity increases
b. the electronegativity decreases
c. the atomic radius decreases
d. the electron affinity increases
20. In a neutral atom
a. the number of protons is always equal to the number of neutrons
b. the number of neutrons is always equal to the number of electrons
c. the number of protons is always equal to the number of electrons
d. the atomic number is always equal to the number of neutrons
21. Consider the equation X(g) + energy = X+ + e–. The "energy" represents
a.
electron affinity
b.
heat of sublimation
c.
ionization energy
d.
sublimation energy
SCH3U
Review for Periodic Table and Reactions
October 5, 2010
22. Electron affinity increases as you go from left to right on the periodic table because
a.
atomic radius decreases
b.
ionization energy decreases
c.
of the periodic law
d.
all of the above
23. When fluorine forms an ionic bond it tends to
a. lose electrons b. gain electrons c. share electrons d. lose protons
24. Copper (II) hydroxide is composed of
a. 2 elements, 2 atoms
b. 2 elements, 3 atoms
c. 3 elements, 4 atoms
d. 3 elements, 5 atoms
25. The IUPAC name for NO2 is
a.nitrite
b.nitrate
c.dinitrogen oxide
26. The IUPAC name for P2I4 is
a
.phosphorus iodide
c. tetraphosphorus diiodide
b.
d.
d.nitrogen dioxide
diphosphorus tetraiodide
phosphorus pentaiodide
27. Which of the following formulas does NOT represent a molecular compound?
a.
CO(g)
b.
Co(s)
c.
CO2(g) d.
CH4(g)
28. Which of these will experience dipole-dipole interactions?
a. CH4, methane
b. carbon monoxide
c. oxygen gas
d. silver nitrate
29. The name of HBrO3 (s) is
a. bromic acid
b. hydrogen perbromate
d. hydrogen bromate
c. bromous acid
30. Which of the following will form a formula unit?
a. C and F
b. C and O
c. K and F
d. K and Na
31. A compound composed of sodium, sulfur, and oxygen would be named
a.
sodium peroxide b.sulfuric acid
c.sodium sulfide
d.sodium sulfate
32. A metallic element X forms a carbonate with the formula X(CO3)2. The corresponding fluoride compound of
element X would have the formula
a.
XF4
b.
XF2
c.
X4F2
d.
X4F
33. The reaction of silver nitrate with zinc would be classified as a
a.
combustion reaction
b.synthesis reaction
c.
double displacement reaction
d.single displacement reaction
34. When baking soda is heated, sodium carbonate, water, and carbon dioxide gas are formed. This reaction can be
classified as
a.synthesis
b.combustion
c.decomposition
d.single displacement
35. Which of the following always indicates that a chemical reaction has taken place?
a.
production of a gas
b.
absorption of heat
c.
change in colour
d.
appearance of a new substance
36.
a.
b.
c.
d.
Which metal would not displace lead, Pb, in a lead nitrate, Pb(NO3)2, solution?
copper, Cu
potassium, K
lithium, Li
magnesium, Mg
True and False.
SCH3U
Review for Periodic Table and Reactions
October 5, 2010
37. ___ The radius of an ion is always larger than the atomic radius of the original atom.
38. ___Most of the metals found above hydrogen in the activity series are found as
elements in the ground.
39. __ Gold is a highly reactive metal.
40. ___ Barium hydroxide produced in a double displacement reaction will precipitate out.
41. ___ Hydrogen is in the activity series because it classifies as a metal.
42. Draw the following Lewis symbols/Lewis structures (2 marks each)
a) oxygen atom
b) chloride ion
c) hydrogen gas
d) carbon tetrafluoride
e) calcium chloride
f) sodium hydroxide
43. Predict the products and write a balanced chemical equation for the following chemical
reactions:
a) Copper wire is added to an aqueous solution of silver nitrate. (3 marks)
b) Potassium metal is added to water. (3 marks)
c) Butane, C4H10 (g), reacts with atmospheric oxygen. (4 marks)
44. Write the complete chemical, total and net ionic equations for a double displacement
reaction between calcium chloride and sodium phosphate. (8 marks)
SCH3U
Review for Periodic Table and Reactions
October 5, 2010
45. Beakers A and B are filled with substances that are liquid at room temperature. The
substance in beaker A experiences London dispersion forces. The substance in beaker B
experience dipole-dipole interactions. Compare and contrast the two force types. Which
substance will boil at a lower temperature and why? (5 marks)
46. For a science fair project, a student wants to design a simple device for removing
certain gases from polluted air. He knows that polar molecules dissolve well in water, so he
bubbles polluted air through a jug of water to remove unwanted gases. For his project, the
student uses air containing the following gases:
1. N2(g)
2. O2(g)
3. HF(g)
4. NH3(g)
5.
6.
7.
8.
CH4(g)
OCl2(g)
C3H8(g)
CH3OCH3(g)
Which gases will dissolve? (4 marks)
47. Explain how first ionization energy is related to atomic radius. (3 marks)
48. Describe what are polar covalent bonds. (3 marks)