# GCE O Level Tuition

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#### Revomal of specific gases from a mixture of gas

 Posted on January 7, 2013 at 8:30 PM comments (9773)

How do you remove a specific gas from a mixture of gases?

It is not very difficult to remove a certain from a mixture, you simply need to know how to do it from it's reactivity and nature point of view.

With regards to the GCE O levels, the most common gases that we can remove, falls under the follow categories.

1. Acidic gases - Wh...

#### Final Physics Reminders

 Posted on October 31, 2012 at 3:45 AM comments (542)

Kinetic Particle Theory

1. The air molecules move in random direction. They collide on the smoke particles in all directions with uneven forces. The smoke particles will move in the direction of the resultant force.

2. See above.

3. Standard, temperature increases, kinetic energy increases.

4. During melting, heat energy is taken in increases the potential energy of the particles. The increase in potential energy causes particles t...

#### Periodic Table Hints

 Posted on August 13, 2012 at 6:35 AM comments (311)

Everything Periodic Table

1 What are the horizontal rows and vertical column in a periodic table known as?

A: The horizontal rows are called period and the vertical column are called group.

2 What information does the group number of an element tells us?

A: It tells us the number of valence electrons that an atom has. For example, group 1 elements have 1 valence electron and group 7 elements have 7 electrons on the outer shell.

3 Wh...

#### Acids Bases and Salt Hints

 Posted on August 2, 2012 at 2:40 AM comments (231)

Everything you want to know about acids

1. What is an acid?

A: An acid is a substance that ionizes in water to produce H+ as the only positive ion.

2. What is an alkali?

A: An alkali is a substance that ionizes in water to produce OH- as the only negative ion.

3. What causes a solution to be acidic?

A: Hydrogen ions, H+.

4. What causes a solution to be alkaline?

A: Hydroxide ions, OH-.

#### Chemistry Reminders

 Posted on October 29, 2011 at 8:25 AM comments (506)

Dear A1 students, do scan through this set of questions. Part 2 incoming. Beep me if you have problem or leave your question in the comment section. Do look through the physics post below too.

Final Reminders Part 1

Kinetic Particle Theory

1 Do you know how to draw the cooling and heating curves?

2 Do you know the state of a substance at a ...

#### Physics 2010 Nagging

 Posted on October 31, 2010 at 2:28 AM comments (403)

Dear all, i can't emphasis the importance of this. READ CAREFULLY.

Otherwise do remember the following pointers.

• Everything in 3sf. Don't waste your brain cells struggling the number of sf, just stick to 3. What happens if its exact value. E.g. 1.23N x 3.21m = 3.9483 Nm. So write that down its ok. But after this step, write this again. =3.95 Nm (3 s.f.)

• What to bring for your exams.

o Calculator that w...

#### The Confusion of Vectors and Scalars

 Posted on May 31, 2010 at 11:46 PM comments (461)

One of the more commonly asked question is the classification of vector and scalar quantities.

.

.

Basically we know that vector quantities has both magnitude (value like 2m/s, 400m etc) and direction (which means there is a possible of positive or negative figures like -5.2m/s).

.

Fortunately, an easy rule can help us to remember them.

Most of us can remember the 3 usual suspects

D...

#### Acid Reactions

 Posted on April 30, 2010 at 8:25 PM comments (61)

Dear all doing acids for this exam,

for reactions of acids, refer to this link.

http://olevelchemistry.blogspot.com/2009/08/acid-reactions-part-1.html

for oxide types

http://olevelchemistry.blogspot.com/2009/08/types-of-oxide.html

for salt making

#### MCQs Answer for 21st Discussion

 Posted on April 14, 2010 at 9:23 AM comments (415)

Chemistry

1-10

B C A A B D D B C D

11-20

A D C B C B B B D A

21-30

C D D C A A B D C B

31-40

D A C D D B D C B C

Physics

1-10

B C C B A D D B D A

11-20

A A D D A B C D B D

#### Topics for Chemistry and Physics MCQ Test

 Posted on February 20, 2010 at 3:46 AM comments (368)

Chemistry MCQ Topics, 10 Questions

1)Gas collection, Volume Measurement, Apparatus

2)Seperation Techniques, Kinetic Particle Theory

3)Atomic Structure, Bonding

4)Periodic Table

5)Metals

6)Mole Calculations

7)Acid Bases Salts

8)Rate of Reactions

9)Redox

10)Heat Changes

Physics MCQ Topics, 10 Questions

1)Kinetics

#### HCl, is it an ionic or covalent molecule?

 Posted on January 21, 2010 at 7:28 AM comments (440)

From Nicole today, she asked if HCl should be considered an ionic or covalent substance, should it possess ionic or covalent properties.

The answer is very simple, HCl is a simple covalent molecule. It is bonded covalently so it has the standard properties of simple covalent molecules.

This link http://www.gcsescience.com/Hydrogen-Chloride-Molecule.gif shows you the dot and ...