Name: Structures and Properties – Unit 2 Test SCH4U
1.
Explain how knowledge of atomic theory and/or molecular structures can contribute to a better
(or worse) life on Earth. In your answer describe 2 points about one specific example from the unit (you may use your RAT as an example or another). (3 marks)
2.
The Structure shown is that of delicious beta-carotene (a compound found in carrots). A clever scientist is thinking that they would like to modify carotene to make a conductive polymer!
(secretly she wants to make a Cloak of Invisibility). Would it be possible for a polymer of carotene to conduct electricity? In your answer state and draw the mechanism by which this could (or could not) occur. Refer to a similar example from the course. Note – you do not have to create a carotene polymer in your answer! (3 marks)
3.
Your teacher wants to make a perfume using cyclohexane as the solvent. Teacher has 3 compounds he wants to dissolve into the cyclohexane; methoxy propane, butanoic acid and butanol. Tell teacher which would dissolve in cyclohexane the best and which would dissolve the least. In your answer be sure to draw at least 2 of the compounds and explain your answer.
(4 marks)

Name: Structures and Properties – Unit 2 Test SCH4U
NF
3
1.
Fill in the following table comparing these 2 compounds: (6 marks)
Name Polar
Molecule?
H-Bond? London
Force
Higher MP? Dissolve in water?
BF
3
Proper Lewis
Structure
2.
The charge on an ion of nickel can be either +2 or +3
Draw the electron configuration for each ion and briefly explain each. (4 marks)
3.
The first Ionization energy of Period 3 increases as you go across the period, with some exceptions. Predict an atom that would have a lower than expected ionization energy and explain based on its electron configuration. (2 marks)

Name: Structures and Properties – Unit 2 Test SCH4U
4.
A Student collects data on 4 different types of solids. Use your knowledge to fill in the missing squares. In the explanation square, explain any ONE of the 2 properties (give your rationale for what you said) 8 marks
Substance Type of Solid Relative Explanation Conduct electricity as solid
Melting Point
NaCl
(s)
Cu
(s)
1.
Which of the following did the Bohr model of the atom help explain? a.
Nuclear structure d. Atomic spectra b.
Structure of the electron c.
Wave property of the atom e. Structure of the alpha particle
2.
Which of the following is an example of a covalent network solid? a.
Sodium, Na
(s) b.
Sucrose, C
12
H
22
O
11 c. Graphite, C
(s) d. Magnesium fluoride, MgF
2(s)
3.
Which of the following electron configurations is impossible for an atom, regardless of whether it is in the ground state or an excited state? a.
1s b.
1s 2
2 2s
2s 1
2 2p
2p
3
1 d. 1s 3 2s 1 2p 4 e. 1s 2 2s 1 2p 3 c.
1s 2 2s 2 2p 6
4.
Which of the following molecules does NOT have a linear shape? a.
HCl d. OCS b.
CO
2 c.
XeF
2 e. BeF
2

Name: Structures and Properties – Unit 2 Test SCH4U
5.
Which of the following electron configurations shows a transition metal atom? a.
1S 2 2s 2 2p 5 d. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 3 b.
1s 2 2s 2 2p 6 3s 2 3p 1 c.
1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 1 e. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 3 4s 2
6.
A substance has a melting point of 1850 O C and a boiling point of 2700 O C is insoluble in water and is a good insulator of electricity. The substance is most likely a.
An ionic solid b.
A polar covalent solid d. A covalent network solid e. A nonpolar covalent solid c.
A metallic crystal
7.
For Titanium a.
Sketch the ground state electron configuration (2 marks) b.
Pick an electron in the ‘d’ subshell of titanium and give the 4 Numerical quantum number “address” of its location. (eg. n, l, m l
, m s
) 4 marks

Name: Structures and Properties – Unit 2 Test SCH4U
8.
Fill in the following table of history: (1 marks each square = 6 marks)
Scientist Key Experiment he did or explained
Brief Explanation of Results
Planck
Gold Foil
Experiment
Einstein
9.
Draw Lewis Structures for each of the following and identify the base shape. Show any resonance structures. (3 marks each) a.
Cl0
3
1c. PF
5 b.
SO
2
Extra: Answer only when done the rest of the test and you have checked it over:
1.
Some people like to name things – name 11 of the 12 unnamed formulae on this test