The Periodic Table - Student Copy
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YISHUN INNOVA JUNIOR COLLEGE
2021 JC2 H2 CHEMISTRY
THE PERIODIC TABLE (FOUNDATION)
ACJC/2020/I/26
1
Which compound dissolves in water to give a solution with the lowest pH?
A
SO
3
C
P
4
O
10
B
MgC
l
2
D
A
l
2
O
3
ACJC/2020/I/27
2
The melting points of five consecutive elements in Period 3 are represented in the diagram
below.
simple molecular
giant metallic lattice
giant molecular
A
E
&
L
G, H
&
J
none
B
L
E
,
G
,
H
&
J
none
C
E
&
L
G
&
H
J
D
L
E
,
G
&
H
J
DHS/2020/I/7
3
Which one of the following sets of solid substances includes a giant metallic structure, a
giant ionic lattice structure and a simple molecular structure?
A
Sr, A
l
2
O
3
,
I
2
B
Be, A
l
C
l
3
, SO
3
C
A
l
, C, SiO
2
D
Ni, BeC
l
2
,
SiC
l
4
DHS/2020/I/14
4
X
,
Y
and
Z
are elements in Period 3. The results of some experiments carried out with
compounds of these elements are shown.
element
result of adding the oxide
of the element to H
2
O(l)
result of adding the chloride
of the element to H
2
O(l)
X
no reaction
hydrolyses
Y
forms hydroxide
dissolves
Z
forms acid
hydrolyses
Which statement is correct?
A
The melting
point of the oxide of
X
is the highest among all Period 3 oxides.
B
Chloride of
Y
is a liquid at 20
C.
C
Z
could be either phosphorus or sulfur.
D
The electrical conductivity increases from
X
to
Z
.
RI/2020/I/5
5
Oxides of elements Mg, A
l
, Si and P are separately added to water and the pH of their
resultant mixtures are measured.
Which graph shows the correct trends when the melting points of these elements are
plotted against the pH of the resultant mixtures?
A
B
C
D
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RI/2020/I/7
6
The graph shows the second ionisation energies of six consecutive elements with atomic
numbers less than 20.
Which statements are correct?
1
V could be helium.
2
W reacts more vigorously than X with water.
3
Y has a higher electrical conductivity than Z.
A
1, 2 and 3
C
1 and 3 only
B
1 and 2 only
D
2 and 3 only
NYJC/2020/III/3
7
(a)
There are three types of atomic radii listed in the
Data Booklet
: metallic, covalent and
van der Waals.
(i)
Explain what is meant by
‘covalent radius of chlorine’.
[1]
(ii)
The diagram below represents two chlorine molecules. Label on the diagram
the covalent radius
and
van der Waals radius of chlorine.
[1]
(iii)
The atomic radius of argon is described in the
Data Booklet
as the van der
Waals radius. Suggest, with a reason, how the van der Waals radius of chlorine
might compare with the van der Waals radius of argon.
[1]
(iv)
Suggest why argon does not have a covalent radius.
[1]
(b) X
,
Y
and
Z
are elements in Period 3. Data about the reactions of the oxides of
X
,
Y
and
Z
are given in the table below.
Reaction
Reagent added to oxide
Observation
1
HCl(aq)
Only oxide of
X
dissolves.
2
NaOH(aq)
Only oxides of
X
and
Z
dissolve.
3
H
2
O(l)
Oxides
X
and
Y
do not dissolve. Green
solution obtained when Universal Indicator
is added.
(i)
Based on the observation for each reaction, complete the following blanks by
stating all the possible identities of the relevant element(s).
Reaction Deduction
1
X
can be
…………………………………
2
X
and
Z
can be
…………………………
3
X
and
Y
can be
…………………………
[3]
(ii)
Identify
X
and
Y
, and hence explain the observation for reaction 3.
[3]
(c)
The chlorides of the elements, sodium to phosphorus, dissolve or react with water.
(i)
In the table below, state the variation in pH of the solutions obtained when one
mole of each of these chlorides is separately added to 1 dm
3
of water.
NaC
l
MgC
l
2
AlC
l
3
PC
l
5
pH of a 1 mol dm
−3
solution
[1]
(ii)
Explain the pH of the resultant solutions when MgC
l
2
and
PC
l
5
are added
to
excess water separately. Support your answer with relevant equations, showing
state symbols.
[3]
RI/2020/II/5c
8
(a)
Aluminium oxide and phosphorus pentachloride are compounds of Period 3 elements.
(i)
Aluminium oxide dissolves in excess NaOH(aq) to form a colourless solution.
Write an equation to show the dissolution of aluminium oxide in excess
NaOH(aq).
[1]
(ii)
On adding phosphorus pentachloride to water, dense white fumes are observed.
Write an equation for the reaction and state the pH of the resultant solution
formed.
[2]
YISHUN INNOVA JUNIOR COLLEGE
2021 JC2 H2 CHEMISTRY
THE PERIODIC TABLE (ADVANCED)
VJC/2020/I/7
9
The graph below shows the variation in the boiling point for 8 consecutive elements in the
Periodic Table, all with atomic number less than 21.
Which statements are correct?
1
The chloride of E reacts with aqueous sodium hydroxide to give a precipitate
which is soluble in excess sodium hydroxide.
2
The oxide of F is neutral in aqueous solution.
3
The oxide of K dissolves readily in water to give a strongly alkaline solution.
A
1, 2 and 3
C
1 only
B
1 and 2 only
D
2 and 3 only
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NJC/2020/I/8
10
The graph below shows the variation in the enthalpy change of vaporisation,
ΔH
Ɵ
vap
for 8
consecutive elements in the Periodic Table, all with atomic number ≤ 20.
What can be deduced from the above graph?
A
The oxide of
A
reacts with excess aqueous sodium hydroxide to form a soluble
complex.
B
The chlorides become less acidic from
A
to
C
.
C
The electrical conductivity decreases from
C
to
F
.
D
The pH of the solution containing the oxides of
G
and oxides of
H
is less than 7.
NJC/2020/II/1c
11 (a)
(i)
A metal chloride
A
, has the formula MC
l
x
. When 3.0
×
10
−
3
mol of sodium
hydroxide is reacted completely with 1.0
×
10
−
3
mol of
A
, 0.078g of a white
precipitate,
B
is formed. When
B
is heated, water is lost, leaving a white residue
C
.
C
is of high melting point and is not soluble in water.
Deduce the identities of
A
,
B
and
C
.
[3]
(ii)
Compound
C,
Na
2
O and SO
3
are separately added to acid and alkali. Write
equations, with state symbols, for possible reactions that occur.
[3]
Related Questions
Which solution has the greatest conductivity?
0.1 M HCl
0.1 M CH3OH
0.1 M CH3COOH
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Choose
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using the image, explain the structure and formation of hydrated ions.
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For the chemical reaction
HCN(aq) + KOH (аq)
H,O(1) + KCN(aq)
write the net ionic equation, including the phases.
net ionic equation:
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help
國山T@
9
lacBool
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1. MgO(s)+2 HCl(aq)->MgCl2(aq)+H2O(l) H1=
2. Mg(s)+2HCl(aq)->MgCl2(aq)+H2(g) H2=
3. H2(g)+1/2 O2(g)->H2O(l) H3=
4. Mg(s)+1/2 O2(g)->MgO(s) H4=
enthalpy for formation of water:
2H2(g)+O2 (g)-> 2H2O(l) H=-572kJ
arrow_forward
1/T (K-¹)
2 N₂O5(g) → 4NO2(g) + O₂(g)
K(S-¹)
4.87 x 10-3
1.50 x 10-³
4.98 x 10-4
1.35 x 10-4
3.46 x 10-5
7.87 x 10-7
T (K)
338
0.0030
328
0.0030
318
0.0031
308
0.0032
298
0.0034
273
6.0037
The data in the table above provide the temperature dependence of the rate constant for the reaction
shown. Complete the table with required information to 2 significant figures each.
- a=-12571.42
In K, no units
5.3
- 6.5
7.6
8.9
Carefully construct a neat and well labelled graph/plot of In K (y-axis) versus 1/T (x-axis) in the appropriate
quadrant (s), using EXCEL or the template below; then determine the slope and activation energy, Ea for the given
reaction. Recall that the Arrhenius Equation is represented in a more useful form as In K= In A- (Ea/RT) & R=
8.31 x 10-³ kJ/mol-K. Determine by calculation, the value of Ea in kj/mole given that, slope = -E/R
slope:
- Ca = slope & - Ga=
€ag
Ea=-(-12571.42) x (8.3) x 10 Rg/mol-K)
Ea=104.47 kj/md
10.3
- 14.1
Y = (-14.1)-(-5.3) = -8.8
x = (0.0037) -…
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Which has the highest boling point to the lowest?1. 0.16 m K2S2. 0.17 m CoCl23. 0.14 m Al(CH3COO)34. 0.46 m Urea(nonelectrolyte)
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What is the XNaOH in an aqueous solution prepared by dissolving 8.00 g of NaOH in 100.0 g of H2O?
Molar mass of NaOH is 40.00 g/mol. Molar mass of water is 18.02 g/mol.
0.0800
0.0741
0.0348
0.0360
arrow_forward
Seawater contains an average of 1.08 x 103 ppm of Na* and 270 ppm of SO42. Calculate
the molar concentrations of Na* and SO,2 given that the average density of seawater is
1.02 g/mL.
a. [Na*]= 9.74 x 102 M, [SO4?]= 7.82 x 103 M
O b. [Na*]= 7.49 x 102 M, [SO4?]= 8.27 x 103 M
c. [Na*]= 2.87 x 102 M, [SO,2)= 4.79 x 103 M
O d. [Na*]= 4.79 x 102 M, [SO,2]= 2.87 x 103 M
O e. None of these
arrow_forward
Give one example each of a solid solution, a liquid solution, and a gaseous solution.Solid solution:
copper granite pizza bronze
Liquid solution:
salt water mercury Italian salad dressing vegetable soup
Gaseous solution:
fog oxygen air helium
arrow_forward
Sea water contains an average of 1.08 x103ppm of Na+ Calculate the * pNa sea water. (Na= 23)
arrow_forward
Step by step full solution
arrow_forward
Which one of the following solutions would be expected to have the highest electrical conductivity?
Select one:
a. 0.70 M KNO3(aq)
O b. 0.50 M Ca(NO3)2(aq)
O c. 0.60 M NazSO4(aq)
d. 0.40 M KPO.(aq)
e. 0.70 M CH,COOH(aq)
arrow_forward
Choose the substance that is classified correctly?
O NaF is a basic salt in aqueous solution
O AICI, is a neutral salt in aqueous solution
O FeBrz is basic salt in aqueous solution
O KCI is an acidic salt in aqueous solution
arrow_forward
Part 1
An aqueous solution is prepared in which 0.00192 mol Ni(NO3)2 and 0.353 mol NH3 are dissolved in a total volume of 1.00 L.
Classify the species present in the resulting solution according to their relative amounts. K, for Ni(NH3),2* is equal to 5.5 x 10°.
lons in Solution (2 items) (Drag and drop into the appropriate area below)
Ni(NH3l62*
Ni(H;O),*
Calculate the concentration of Ni(H,O),2* ions at equilibrium in the solution formed.
0.00192
M
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- For the chemical reaction HCN(aq) + KOH (аq) H,O(1) + KCN(aq) write the net ionic equation, including the phases. net ionic equation: about us careers privacy policy terms of use contact us help 國山T@ 9 lacBoolarrow_forward1. MgO(s)+2 HCl(aq)->MgCl2(aq)+H2O(l) H1= 2. Mg(s)+2HCl(aq)->MgCl2(aq)+H2(g) H2= 3. H2(g)+1/2 O2(g)->H2O(l) H3= 4. Mg(s)+1/2 O2(g)->MgO(s) H4= enthalpy for formation of water: 2H2(g)+O2 (g)-> 2H2O(l) H=-572kJarrow_forward1/T (K-¹) 2 N₂O5(g) → 4NO2(g) + O₂(g) K(S-¹) 4.87 x 10-3 1.50 x 10-³ 4.98 x 10-4 1.35 x 10-4 3.46 x 10-5 7.87 x 10-7 T (K) 338 0.0030 328 0.0030 318 0.0031 308 0.0032 298 0.0034 273 6.0037 The data in the table above provide the temperature dependence of the rate constant for the reaction shown. Complete the table with required information to 2 significant figures each. - a=-12571.42 In K, no units 5.3 - 6.5 7.6 8.9 Carefully construct a neat and well labelled graph/plot of In K (y-axis) versus 1/T (x-axis) in the appropriate quadrant (s), using EXCEL or the template below; then determine the slope and activation energy, Ea for the given reaction. Recall that the Arrhenius Equation is represented in a more useful form as In K= In A- (Ea/RT) & R= 8.31 x 10-³ kJ/mol-K. Determine by calculation, the value of Ea in kj/mole given that, slope = -E/R slope: - Ca = slope & - Ga= €ag Ea=-(-12571.42) x (8.3) x 10 Rg/mol-K) Ea=104.47 kj/md 10.3 - 14.1 Y = (-14.1)-(-5.3) = -8.8 x = (0.0037) -…arrow_forward
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