Sm0260 Chemistry for Life Science

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  • Topic: Electron, Electron configuration, Atom
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Faculty of Science

Undergraduate Modular Scheme

Session 2010/2011

Semester 1

Level 3

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MODULE:SM0260: Chemistry for Life Sciences
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DATE:17 January 2011
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TIME:14.00 – 16.00

Instructions to Candidates

This paper contains THIRTY FOUR questions in TWO sections: Section A and Section B
Section A:Answer ALL THIRTY multiple choice questions on the MCQ answer sheet provided using a soft pencil
Each question correctly answered receives 2 marks
Ensure that your student ID number is recorded correctly on the MCQ answer sheet
Section B:Answer ALL FOUR questions in the answer book provided
Each question carries 10 marks

CANDIDATES ARE PERMITTED TO BRING ONE APPROVED CALCULATOR INTO THIS EXAMINATION: from either Casio FX83 or Casio FX85 series (with any suffix), FX115MS, FX570ES or FX991ES

Invigilators are under instruction to remove any other calculators

Number of Pages: 1 – 11
SECTION A

Answer ALL THIRTY questions from this section

1.If you move one element to the right on the periodic table which ONE of the following is always TRUE?

A.an extra electron is added to a previously empty orbital
B.the charge on the atom increases by 1
C.the number of neutrons increases by 1
D.the number of protons increases by 1
E.all of the above

2.Which ONE of the following best describes what happens when an electron moves to a lower energy shell?

A.the nucleus decays
B.a quantum of energy is emitted
C.a quantum of energy is absorbed
D.a negative ions forms
E.a positive ion forms

3.Which ONE of the following shows the set of quantum numbers for an electron in a 2p orbital?

A.n = 1, l = 0, ml = 0, ms =½
B.n = 2, l = 0, ml = 0, ms =½
C.n = 2, l = 1, ml = 0, ms = -½
D.n = 2, l = 1, ml = ½, ms = -½
E.n = 3, l = 1, ml = 1, ms = -½

4.A triple bond between carbon atoms will consist of which type(s) of bond?

A.three σ bonds
B.one σ and two π bonds
C.two σ and one π bond
D.three π bonds
E.any of the above combinations

5.Which ONE of the following statements is TRUE about a set of sp3 orbitals?

A.there are 4 orbitals
B.they have angles of 120º between them
C.they are set up to participate in double bonds
D.each orbital contains 2 nodes
E.each orbital is entirely of one phase

Continued...
6.Which ONE of the following is TRUE of methane (CH4)?

A.it contains -bonds
B.it is tetrahedral
C.it contains no molecular orbitals
D.the C is sp2 hybridised
E.the C and H are both sp3 hybridised

7.Which ONE of the following statements is TRUE of a covalent bond?

A.it will only form between hybridised orbitals
B.it consists of four electrons in a molecular orbital
C.it forms from the overlap of atomic orbitals
D.it always contains between two and four electrons
E.it involves the overlap of atomic nuclei

8.Which ONE of the following statements best describes the O atom in water?

A.it has a charge of -2
B.it has a charge of +2
C.it is a radical
D.it has an incomplete valence shell
E.it is sp3 hybridised

9.Which ONE of the following statements best defines an atom’s electronegativity?

A.the magnitude of its positive charge
B.its affinity for outer shell electrons
C.the size of its electron cloud
D.the number of bonds which it can form
E.the magnitude of its nuclear charge

10.Which ONE of the following groups exerts an inductively electron donating effect (+I)?

A.-Br
B.-OH
C.-NO2
D.-N(CH3)3+
E.-C2H5

Continued...
11.Which ONE of the following solvents would be expected to have...
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