adminO Level Chemistry Tuition Singapore/Chemistry O Level Tuition/Tutor
Chapter 7 – Covalent and Metallic Bonding
1. A covalent bonding is bond formed by sharing of electrons between atoms
2. A single covalent bond consists of one shared pair of electrons
3. A double covalent bond consists of two shared pair or electrons.
4. A molecule is formed when two or more atoms are joined together by covalent bonds.
5. In a molecule, each atom has the electronic configuration of a noble gas.
From : O Level Chemistry Tutor
adminO-Level Singapore/O-Level/Physics and Chemistry Tuition/Physics Tutor
Energy, Work and Power – Key Concepts
1 Work done W by a constant force F is given by the product of the force F and the distance s moved in the direction of the force
ie W = F x s
2. SI unit for work done is joule – J
3. No work done when the direction of the applied force and the direction of in which the object moves are perpendicular to one another.
4. Kinematic energy KE = 1/2 x mass x velocity ^2
5. Potential energy PE = mass x g x height
6. Power = work done / time
From O Level Physics Tutor
adminO-Level Singapore/O-Level/Pure Physics Tuition/Physics Tutor
Energy, Work and Power – Key Concepts
1 Work done W by a constant force F is given by the product of the force F and the distance s moved in the direction of the force
ie W = F x s
2. SI unit for work done is joule – J
3. No work done when the direction of the applied force and the direction of in which the object moves are perpendicular to one another.
4. Kinematic energy KE = 1/2 x mass x velocity ^2
5. Potential energy PE = mass x g x height
6. Power = work done / time
From O Level Physics Tutor
adminO-Level Additional Mathematics Tuition Singapore
Please be inform that 2013 Add Math Tuition Schedule is posted on the website under the tag Class Schedule
O-Level Additional Mathematics Tutor
adminO Level E Maths Tuition Singapore/Tuition O Level E Maths/Tutor
Please be inform 2013 E Maths schedule has been posted on the class schedule.
From O-Level Elementary Mathematics Singapore Tutor
adminA-Level Physics Tuition Singapore/H2 Physics Tuition/JC Physics Tutor
2012 A Level MCQ Ans
1A 2A 3D 4D 5D 6C 7C 8B 9B 10B
11A 12B 13A 14D 15C 16A 17D 18C 19B 20B
21A 22B 23D 24D 25A 26B 27A 28C 29A 30A
31D 32A 33B 34D 35C 36A 37C 38C 39D 40C
From A level tutor
adminA-Level Chemistry Tuition Singapore/H2 Chemistry Tuition/JC Chemistry Tutor
Hi Rachel
Q14 JJC 09/3
No of protons in X + 84 = 115
No of protons in X = 115 – 84 = 31
Atomic number of X = 31
Hence X is Ga
Ans (B)
Q19 NJC 09/2
X and Xn+ has the same no of protons as they are the same element.
Xn+ has fewer electrons than X.
Xn+ is smaller than X due to higher effective nuclear charge (same nuclear charge since same no. of protons but weaker shielding effect).
Xn+ and X have different number of electrons and hence different electronic configuration.
Ans (C)
Q21 HCI 09/5 H1
Discuss on Monday
Q22 NYJC 09/4
Discuss on Monday
Q24 AJC 09/3
N: 1s2 2s22p3
In GaN, N is N3-
Therefore 3 more electrons added to 2p orbital.
Ans (D)
Q28 SAJC 09/4
Element X is in Group III while element Y is in Group VI. Hence the formula formed between X and Y is X2Y3.
Ans (B)
Q37 NJC 09/10 H1
Second I.E. is energy taken in to remove the 2nd outermost electron from one mole of gaseous singly charged cation to form one mole of gaseous doubly charged cation.
Ans (B)
From A Level Tutor
adminA-Level Chemistry Tuition Singapore/H2 Chemistry Tuition/JC Chemistry Tutor
Hi All A-Level/JC/H2/H1 Chemistry Students
Qns : Why is gibbs free energy = 0 for phase change reactions?
Ans : During a phase change, there is an equilibrium between the two phases. The two phases can interchange and hence delta G is zero at equilibrium
From A level Tutors
adminA-Level Economics Tuition Singapore/H2/H1 Economics Tuition
New class!
J2 Economics class for 2013 students will start on 15th Dec 2012 Saturday 7.30pm to 9.30pm
Call 98639633 or 96790479 to register
From A Level admin
adminA-Level Chemistry Tuition Singapore/H2 Chemistry Tuition/JC Chemistry Tutor
Hi All A-Level/JC/H2/H1 Chemistry Students
FAQ : Why alkanes and alkenes are less dense than water?
Alkanes and alkenes have idid whereas water has hydrogen bonding. Stronger inter molecular forces and tighter packing causes water to be more dense.
From A level tutor
adminA-Level Chemistry Tuition Singapore/H2 Chemistry Tuition/JC Chemistry Tutor
Hi All A-Level/JC/H2/H1 Chemistry Students
FAQ : Why alkanes and alkenes are less dense than water?
Alkanes and alkenes have idid whereas water has hydrogen bonding. Stronger inter molecular forces and tighter packing causes water to be more dense.
From A level tutor
adminA-Level Maths Tuition Singapore/H2 Maths Tuition/JC Maths Tut
Hi All
Your hard work will be reflected in your result
All the Best
From A Level Mathematics Tutor
adminA-Level Chemistry Tuition Singapore/H2 Chemistry Tuition/JC Chemistry Tutor
Hi All A-Level/JC/H2/H1 Chemistry Students
Continue to work hard and stay focus for the coming papers
See you on 23 Nov or 24 Nov or 25 Nov for P1 preparation
All the best
From A level Chemistry Tutors
adminA-Level Physics Tuition Singapore/H2 Physics Tuition/JC Physics Tutor
Hi All A-Level/JC/H2/H1 Physics Students
Topics which are absent in Paper 2
Kinematics
Dynamics
Circular Motion
Gravitational Fields
Electric Fields
Superposition
Alternating Currents
Quantum Physics
Laser and Semiconductors
All the best for your P3
adminA-Level Tuition Singapore/GP Tuition/General Paper Tutor
Hi GP Tuition students
All the Best for the coming GP on Monday 5 Nov 2012
From A Level GP Tutor
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