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YISHUN INNOVA JUNIOR COLLEGE 2021 JC2 H2 CHEMISTRY
CHEMICAL BONDING (FOUNDATION) NYJC/2020/I/3 1 In which pair do the species have different shapes from each other? A
BeCl
2
and CO
2
B
BH
4
–
and NH
4
+
C
OF
2
and SCl
2
D
PH
3
and SO
3
NYJC/2020/I/4 2 Liquids X
and Y
do not react with one another. They have identical boiling points. When a particular volume of X
is shaken with a similar volume of Y
, they form a liquid mixture Z
. The average intermolecular forces in liquid Z
are stronger than the average of the forces in X
and the forces in Y
. Which deductions from this information are correct? 1 The mixing of X
and Y
is exothermic. 2 The vapour pressure of liquid Z
will be less than that of either liquid X
or liquid Y
at the same temperature. 3 The boiling point of liquid Z
will be lower than that of either liquid X
or liquid Y
at the same pressure. A
1, 2 and 3 B
1 and 2 only C
2 and 3 only
D
1 only
SAJC/2020/I/5
3 Which species contain a dative (co-ordinate) bond?
1 CO 2 CO
3
2−
3 N
2
H
4
4 N
2
O
4
A 2, 3 and 4 B 1 and 2 only C 1 and 4 only D 3 and 4 only SAJC/2020/I/18
4 Which bond angles are present in sulfonamide? 1 105° 2 107° 3 109.5° 4 120° A 2, 3 and 4 B 2 and 3 only
C 1 and 3 only D 1 only TJC/2020/I/7 5 Which of the following cannot be explained by hydrogen bonding? A The difference in the boiling points between water and ammonia. B The difference in volatility between pentan-2-ol and octan-2-ol. C The difference in boiling point between 2-nitrophenol and 4-nitrophenol. D The difference in the relative molecular mass of ethanoic acid molecules in benzene and in water. NYJC/2020/I/4 6 Element E
has a high melting point of 1287 °C and conducts electricity. The chloride of E
has a melting point of 399 o
C, does not conduct electricity in solid or liquid state, and is soluble in benzene. Which of the following could be element E
? A Beryllium
B Carbon C Copper D
Lithium ACJC/2020/II/1c 7 (c) A diagonal relationship is said to exist between certain pairs of diagonally adjacent elements in the second and third Periods. The elements and their compounds in these pairs are observed to share similar properties. An example of such a pair is beryllium and aluminium. (i) Draw the dot-and-cross diagram for A
l
C
l
3
and state the C
l
−
A
l
−
C
l
bond angle.
Dot-and-cross diagram of A
l
C
l
3
[1] Bond angle: ……………………………….
[1] (ii) Unlike A
l
C
l
3
which dimerises to form A
l
2
C
l
6
, BeC
l
2
polymerises and exists as long chains in the solid state. Draw a section of one chain with three BeC
l
2
monomers, showing clearly the bonding within the chain. [1] (iii) With a small amount of water, BeC
l
2
hydrolyses in the same manner as A
l
C
l
3
. Write an equation for the hydrolysis of BeC
l
2
. DHS/2020/II/3d 8 (d) The bond angle in CO
2
is 180 º. The bond angle in SO
2
is approximately 120 º. Explain the difference in the two bond angles given above. [1] EJC/2020/II/1a-c 9 (a) Nitrogen can form a few hydrides such as NH
3
and N
2
H
4
. The boiling points of these two hydrides are given in Table 1.1. Table 1.1 compound boiling point / ºC NH
3
−
33 N
2
H
4 114 Provide two
explanations for why N
2
H
4
has a higher boiling point than NH
3. [2]
(b) When NH
3
is reacted with BF
3
in the gaseous phase, a white solid of NH
3
BF
3
is formed. (i) Draw a dot-and-cross diagram to show the bonding within NH
3
BF
3
and state the shape about the nitrogen atom. [2] (ii) State the type of reaction that NH
3
has undergone with BF
3
, and explain why it is possible. [2] (c) Both NH
3
and PH
3
have trigonal pyramidal shape, but the bond angles in NH
3
are 107º while those in PH
3
are 94º. By considering the electronegativities of the central atoms, suggest why this is so. [2] HCI/2020/II/5b 10 (b) Sidewalks in many cities are paved with Noxer blocks, which are cement mortar coated with TiO
2
to a thickness of 5 to 7 mm. The photocatalytic properties of TiO
2
enables it to remove pollutants from the air, particularly nitrogen dioxide, NO
2
, and nitrogen monoxide, NO, both of which are radicals. (i) Draw a dot-and-cross diagram to show the bonding in NO
2
. [1] (ii) The bond angle in NO2 is experimentally observed to be 135
o
. Apply the principles of the VSEPR theory to account for this observation. [2] NYJC/2020/II/1c 11 (c) Lead(II) ethanoate, Pb(CH
3
COO)
2
, also known as sugar of lead
is a white crystalline solid which is soluble in water and has a sweet taste. Ancient Romans used sweeteners that contained lead(II) ethanoate to sweeten wine or preserve fruit. Lead(II) ethanoate is no longer used in the production of sweeteners because of its recognised toxicity. Draw simple diagrams to show how a water molecule can be attached to a lead(II) cation, and to an ethanoate anion. Label each diagram to show the type of interaction involved. [3]
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Related Questions
Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling
point, choose 2 next to the substance with the next highest boiling point, and so on.
chemical symbol,
substance
chemical formula
boiling point
or Lewis structure
H
H
H
..
Н — С — С — О — С —Н
А
(Choose one)
н н
H
Ar
(Choose one)
Cr
(Choose one)
H
H -
С — Н
..
:N –0- H
(Choose one)
|
Н — С — Н
H
- Z -
- C
arrow_forward
Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling
point, choose 2 next to the substance with the next highest boiling point, and so on.
substance
A
B
с
D
chemical symbol,
chemical formula
or Lewis structure
HgCl₂
H₂
HC1
..
H-0-0-H
boiling point
(Choose one)
(Choose one)
(Choose one) v
(Choose one)
X
S
arrow_forward
For each compound in the table below, decide whether there would be any hydrogen-bonding force between molecules of the compound, or between molecules
of the compound and molecules of water.
name
acetic acid
ammonia
compound
dibromomethane.
formula or Lewis
structure
H :O:
| ||
H-C-C-0-H
1
H
ΝΗ,
CH₂Br₂
Between
molecules of the
compound?
O yes
O no
10000
O yes
O no
hydrogen-bonding force
O yes
O no
Between molecules of
the compound and
molecules of water?
O yes
O no
O yes
O no
O yes
O no
X
3
arrow_forward
Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the
highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on.
chemical symbol,
chemical formula
or Lewis structure
substance
boiling point
A.
He
(Choose one) e
ala
B.
Fe
(Choose one) e
Ar
H–C=N:
(Choose one) e
H –C=C– H
(Choose one) e
Explanation
Check
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80
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DD
esc
F7
FB
F10
11
F3
F4
F5
F9
F1
F2
@
%23
$
%
&
1
7
8
< cO
arrow_forward
Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling point, choose 2 next to
the substance with the next highest boiling point, and so on.
chemical symbol,
chemical formula
or Lewis structure
substance
boiling point
A
Н— С- Н
(Choose one)
H
(Choose one)
Nb Cls
B
1 (highest)
H-N H
2
H
3
: Cl :
4 (lowest)
: Cl –C -
(Choose one) v
D
: Cl :
Submit Assign
Continue
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For each compound in the table below, decide whether there would be any hydrogen-bonding force between molecules of the compound, or between molecules
of the compound and molecules of water.
name
formic acid
compound
dibromomethane
acetic acid
formula or Lewis
structure
:0:
||
H-C-O-H
CH₂Br₂
H :0:
| ||
H-C-C-O-H
H
Between
molecules of the
compound?
00
00
yes
no
yes
no
yes
hydrogen-bonding force
no
Between molecules of
the compound and
molecules of water?
00
00
yes
no
yes
no
yes
no
X
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Name:
Worksheet 1
Molecular Geometry & Polarity
For each of the molecules or ions below, (1) draw Lewis dot structure (Remember the Octet
Rule), predict (2) molecular geometry and (3) polarity based on VSEPR theory, then indicate
(4) types of Intermolecular Forces.
Molecule
Electron Dot Structure
Molecular
Molecular
Intermolecular
or ion
Geometry
Polarity
Forces
CH;Br
N13
H2S
CS2
SO2
CO3 2
OF2
AsCl3
NH41
arrow_forward
4. Fez(HPO4)3
iron (III) hydrogen phosphate
shape at the P =
type of molecule =
5. CH;CH2CH2CN
all 4 carbons are bonded to each other in a row, N has a multiple bond
(butanenitrile) See Examples of Organic Molecules in Chapter 10
shape at the C bonded to the N =
type of molecule =
6. CH;CH2CH2OH
all 3 carbons are bonded to each other in a row (1-propanol)
shape at the O =
type of molecule =
arrow_forward
Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling
point, choose 2 next to the substance with the next highest boiling point, and so on.
chemical symbol,
substance
chemical formula
boiling point
or Lewis structure
А
Nb Clg
(Choose one)
H
H -
С — Н
В
(Choose one)
H
Н — N— H
-
C
(Choose one)
H
: Cl:
: Cl
С — СІ :
(Choose one)
|
: Cl :
:Z - I
arrow_forward
Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling
point, choose 2 next to the substance with the next highest boiling point, and so on.
chemical symbol,
chemical formula
or Lewis structure
substance
boiling point
dh
A
NO
(Choose one) 0
:0: H
H C-C-– H
(Choose one) 8
H.
:0:
H-C-N– H
(Choose one) e
N2
(Choose one) e
D
Check
Explanation
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ill LLC. All Rights Reserved. Terms of Use I Privacy Center / Accessibility
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4.
Y U I
D
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Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest
boiling point, choose 2 next to the substance with the next highest boiling point, and so on.
chemical symbol,
substance
chemical formula
boiling point
or Lewis structure
Ar
(Choose one)
A
В
Cr
(Choose one) v
H
H.
H.
H - C - C - ) - C
H
(Choose one)
|
H
H
H.
H
H - C -H
D
:N
- O - H
(Choose one) ♥
Н—С — Н
?
:0 :
:
arrow_forward
compound
hydrogen-bonding force
Between
Between molecules of
formula or Lewis
molecules of the
the compound and
molecules of water?
name
structure
compound?
H
H
O yes
yes
ethane
Н — с —с — н
no
no
H
H
H
H
yes
çi:
yes
N-chloromethylamine
Н—с —N
no
no
H
yes
yes
iodomethane
CH,I
no
no
O O
O O
:ö:
arrow_forward
Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling
point, choose 2 next to the substance with the next highest boiling point, and so on.
chemical symbol,
chemical formula
or Lewis structure
substance
boiling point
A
H,
(Choose one) v
HgCl,
(Choose one) ♥
B
HCl
(Choose one) v
D
Н— О
О — Н
(Choose one) ♥
(Choose one)
1 (highest)
2
3
4 (lowest)
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For each compound in the table below, decide whether there would be any hydrogen-bonding force between molecules of the compound, or between molecules
of the compound and molecules of water.
compound
hydrogen-bonding force
Between
molecules of the
compound?
Between molecules of
the compound and
molecules of water?
formula or Lewis
name
structure
O yes
O yes
formaldehyde
CH,O
O no
O no
H.
O yes
O yes
methanol
н -с —ӧ—н
O no
O no
H.
N- C:
O yes
O no
O yes
O no
N-chloromethylamine
Н-С
H.
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Below is the structure for sorafenib (C21H16ClF3N4O3). This type of structure is called a line drawing. Most carbon atoms are represented by the vertices of the line drawing and many hydrogens are not shown, but you should be able to determine where they should be based on the octet rule for carbon
draw the intermolecular interaction between three water molecules and the circled region of the molecule
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35. Which of the following does have the highest boiling point?
molar masses: C = 12.01 g/ mole, S = 32.07 g/ mole, O = 16.00 g/ mole, H = 1.008 g/mole, I = 126.9 g/mole, Cl = 35.45 g/mole
electronegativities:
C = 2.5, H = 2.1, O = 3.5, Cl = 3.0, S= 2.8 , I = 2.3
a.COb.HClc.I2d.SO2
arrow_forward
2
4
5
6
7
For each compound in the table below, decide whether there would be any hydrogen-bonding force between molecules of the compound, or between molecules
of the compound and molecules of water.
compound
hydrogen-bonding force
formula or Lewis
Between
molecules of the
name
Between molecules of
structure
the compound and
molecules of water?
compound?
yes
yes
hydrogen iodide
HI
no
no
yes
yes
NH3
ammonia
no
no
н :0:
н
yes
yes
Н—с —с-о — н
no
acetic acid
no
Н
?
x 5
Submit
2019 McGraw-Hill Education. All Rights Reserved Terms o
Continue
MacBook Pro
F.O
F8
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You come across a bottle in the stock room labeled CHCl3
a.Draw the Lewis dot structure of the molecule
b.Identify the molecular geometry of the molecule
c.dentify if the molecule is polar or non-polar.
d.Do you expect this molecule to interact more with water (H2O) or methane (CH4)?Explain why.
arrow_forward
Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling
point, choose 2 next to the substance with the next highest boiling point, and so on.
substance
A
B
C
D
chemical symbol,
chemical formula
or Lewis structure
HCI
H₂
H-0-0-H
6-6.
HgCl₂
boiling point
(Choose one)
(Choose one) ✓
(Choose one) ✓
(Choose one)
X
A
arrow_forward
Which pair of molecules will show hydrogen bonding?
I. HF and NH3 II CH,Cl and HCI I. CH4 and CH3CH3 IV. CH3OH and CH,CH3
V. H2O and CH,OH
O I and V
O I and IV
O I V only
O Il and V
O I and III
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which of the following compounds can form strong hydrogen bonding with itself?
arrow_forward
compound
hydrogen-bonding force
Between
Between molecules of
formula or Lewis
the compound and
molecules of water?
name
molecules of the
structure
compound?
H :ċi:
yes
yes
N,N-
dichloromethylamine
H - C -N
|
no
no
H
yes
yes
ammonia
NH,
no
no
yes
yes
hydrogen chloride
HCl
no
no
O O
arrow_forward
c) 35°C
2. Large Molecules
Most vitamins are large molecules. For each of the molecules below, circle or highlight
the polar bonds and determine whether each molecule will be water-soluble (i.e. polar) or
fat-soluble (i.e. nonpolar).
ÇH,
ÇH,
H H
CH3
H
Hl
CH3
Vitamin A
нн
Vitamin B
H H
C O:
Vitamin C
H H
H H
H-C
Hl Č
HH
H.
CH
H.
H.C
CH3
CH,
HH
Vitamin D3
H.
H.
:O:
%3D
シー
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Match each item with the correct statement
¡¡¡· · · ·
What are bonds between
molecules called?
What is a property of
polar molecules?
What is a property of
nonpolar molecules?
What is the collective
name for intermolecular
bonding?
What is the only force of
attraction between noble
gases?
What dipole-dipole force
between H and
N, O, or F?
results
either
What makes water a
highly polar molecule?
What force is responsible
for holding polar
molecules to one another?
1.
2.
3. intermolecular
4.
5.
6.
7.
London dispersion
polar covalent bonds and
symmetrical structure
hydrophobic
9.
van der Waals forces
hydrogen bond
polar covalent bonds and
asymmetrical structure
8. intramolecular
hydrophilic
10. dipole-dipole
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- Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on. chemical symbol, chemical formula or Lewis structure substance boiling point A. He (Choose one) e ala B. Fe (Choose one) e Ar H–C=N: (Choose one) e H –C=C– H (Choose one) e Explanation Check O 2022 McGraw Hill LLC. AIl Rights Reserved. Terms of Use I Privacy Center Accessibility 23 étv 80 DI DD esc F7 FB F10 11 F3 F4 F5 F9 F1 F2 @ %23 $ % & 1 7 8 < cOarrow_forwardRank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on. chemical symbol, chemical formula or Lewis structure substance boiling point A Н— С- Н (Choose one) H (Choose one) Nb Cls B 1 (highest) H-N H 2 H 3 : Cl : 4 (lowest) : Cl –C - (Choose one) v D : Cl : Submit Assign Continue Privacy Center| Acces © 2022 McGraw Hill LLC. All Rights Reserved. Terms of Usearrow_forwardFor each compound in the table below, decide whether there would be any hydrogen-bonding force between molecules of the compound, or between molecules of the compound and molecules of water. name formic acid compound dibromomethane acetic acid formula or Lewis structure :0: || H-C-O-H CH₂Br₂ H :0: | || H-C-C-O-H H Between molecules of the compound? 00 00 yes no yes no yes hydrogen-bonding force no Between molecules of the compound and molecules of water? 00 00 yes no yes no yes no Xarrow_forward
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- Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on. chemical symbol, chemical formula or Lewis structure substance boiling point dh A NO (Choose one) 0 :0: H H C-C-– H (Choose one) 8 H. :0: H-C-N– H (Choose one) e N2 (Choose one) e D Check Explanation O 2022 McGraw ill LLC. All Rights Reserved. Terms of Use I Privacy Center / Accessibility MacBook Air %23 3 4. Y U I Darrow_forwardRank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on. chemical symbol, substance chemical formula boiling point or Lewis structure Ar (Choose one) A В Cr (Choose one) v H H. H. H - C - C - ) - C H (Choose one) | H H H. H H - C -H D :N - O - H (Choose one) ♥ Н—С — Н ? :0 : :arrow_forwardcompound hydrogen-bonding force Between Between molecules of formula or Lewis molecules of the the compound and molecules of water? name structure compound? H H O yes yes ethane Н — с —с — н no no H H H H yes çi: yes N-chloromethylamine Н—с —N no no H yes yes iodomethane CH,I no no O O O O :ö:arrow_forward
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