2002 p2, ib sh!t, pastpapers, chemia

2002 p2

2002 p2, ib sh!t, pastpapers, chemia

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IB DIPLOMA PROGRAMME
M02/420/H(2)
PROGRAMME DU DIPLíME DU BI
PROGRAMA DEL DIPLOMA DEL BI
CHEMISTRY
HIGHER LEVEL
PAPER 2
Name
Monday 20 May 2002 (afternoon)
Number
2 hours 15 minutes
INSTRUCTIONS TO CANDIDATES
Write your candidate name and number in the boxes above.
Do not open this examination paper until instructed to do so.
Section A: Answer all of Section A in the spaces provided.
Section B: Answer two questions from Section B. Write your answers in a continuation
answer booklet, and indicate the number of booklets used in the box below. Write
your name and candidate number on the front cover of the continuation answer
booklets, and attach them to this question paper using the tag provided.
At the end of the examination, indicate the numbers of the Section B questions answered in the
boxes below.
QUESTIONS ANSWERED
EXAMINER
TEAM LEADER
IBCA
SECTION A
ALL
/40
/40
/40
SECTION B
QUESTION
.........
/25
/25
/25
QUESTION
.........
/25
/25
/25
NUMBER OF CONTINUATION
BOOKLETS USED
TOTAL
TOTAL
TOTAL
.........
/90
/90
/90
222-153
10 pages
Î 2 Î
M02/420/H(2)
SECTION A
Candidates must answer
all
questions in the spaces provided.
In order to receive full credit in Section A, the method used and the steps involved in arriving at your answer
must be shown clearly. It is possible to receive partial credit but, without your supporting work, you may
receive little credit. For numerical calculations, you are expected to pay proper attention to significant figures.
1.
The following data were obtained for the reaction between gases
A
and
B
:
Experiment
Initial concentration of
reactants / mol dm
−3
Initial rate of reaction
/ mol dm min
−3
−1
A
B
1
1.0 10
−
3
2.0 10
−
×
3
3.0 10
−
×
4
2
2.0 10
−
3
2.0 10
−
×
3
3.0 10
−
×
4
3
1.0 10
−
3
4.0 10
−
×
3
1.2 10
−
×
3
(a) Define the term
overall order of reaction
.
[2]
.........................................................................
.........................................................................
(b) Deduce the order of reaction with respect to
A
and the order of reaction with respect to
B
.
[2]
.........................................................................
.........................................................................
.........................................................................
(c) Write the rate expression for the reaction between
A
and
B
.
[1]
.........................................................................
(d) Use the data from Experiment 1 to calculate the value of the rate constant for the reaction and
state its units.
[2]
.........................................................................
.........................................................................
.........................................................................
(e) The reaction between gases
A
and
B
is repeated at a pressure double that of the original.
Determine how many times faster the reaction will be when the pressure is doubled.
[1]
.........................................................................
(This question continues on the following page)
222-153
×
×
×
Î 3 Î
M02/420/H(2)
(Question 1 continued)
(f) Some solids act as
heterogeneous
catalysts in this reaction. State what is meant by the term
heterogeneous
and outline how such catalysts work.
[3]
.........................................................................
.........................................................................
.........................................................................
.........................................................................
.........................................................................
(g) State and explain how the following changes affect the rate of reaction between
A
and
B
:
(i) Using a catalyst
[2]
.....................................................................
.....................................................................
.....................................................................
(ii) Decreasing the temperature
[2]
.....................................................................
.....................................................................
.....................................................................
222-153
Turn over
Î 4 Î
M02/420/H(2)
2.
The existence of isotopes in magnesium can be shown using a mass spectrometer. The operation of
a mass spectrometer can be described in terms of five main stages. The first is evaporation and the
last is detection.
(a) After evaporation, the magnesium is then ionised. Outline how it is ionised.
[2]
.........................................................................
.........................................................................
.........................................................................
(b) State the names, in the correct order, of the other two stages, and in
each
case state the
technique used.
[4]
.........................................................................
.........................................................................
.........................................................................
.........................................................................
.........................................................................
.........................................................................
(c) The relative abundances of the three isotopes of magnesium are as follows:
24
Mg 78.6 % , Mg 10.1 % , Mg 11.3 %
25
=
26
=
.
Calculate the relative atomic mass of magnesium using these values, giving your answer to
three decimal places.
[2]
.........................................................................
.........................................................................
.........................................................................
.........................................................................
(d) Write the electronic configuration of magnesium using the spdf notation.
[1]
.........................................................................
222-153
=
Î 5 Î
M02/420/H(2)
3.
In aqueous solution, hydrochloric acid is a strong acid and ethanoic acid is a weak acid.
(a) Use the Br¾nstedÎLowry theory to state why
both
substances are classified as acids.
[1]
.........................................................................
.........................................................................
(b) Solutions of 0.1
mol dm
−
3
hydrochloric acid and 0.1
mol dm
−
3
ethanoic acid have different
electrical conductivities.
(i) State and explain which solution has the greater conductivity.
[1]
.....................................................................
.....................................................................
.....................................................................
(ii)Calculate the pH value of 0.1
mol dm
−
3
hydrochloric acid, and suggest a value for the
pH of 0.1
mol dm
−
3
ethanoic acid.
[2]
.....................................................................
.....................................................................
.....................................................................
.....................................................................
(c) Write an equation to show the reaction of ethanoic acid with water and classify
each
product
as a Br¾nstedÎLowry acid or base.
[2]
.........................................................................
.........................................................................
.........................................................................
(d) Use information from Table 16 of the Data Booklet to calculate the value of the ionisation
constant, , of ethanoic acid.
a
[1]
.........................................................................
.........................................................................
(e) Write the expression for the ionisation constant, , of ethanoic acid.
K
a
[1]
.........................................................................
.........................................................................
(This question continues on the following page)
222-153
Turn over
K
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Linki

: 3. Próbna matura 2008 -poz. rozszerz.odp.+ koment, NAUKA, Chemia - matura+studia, Arkusze maturalne, Arkusze maturalne od 2001

: 2005.05 pr, NAUKA, Chemia - matura+studia, Arkusze maturalne, Arkusze maturalne od 2001