## Organic Chemistry Questions and Answers (O level Chemistry)

Organic Chemistry Questions and Answers (O level Chemistry) Organic chemistry deals with the compounds of carbon, except for carbonates and carbon dioxide. The following is a list of organic chemistry questions and expected answers for O level chemistry students. The Read more…

## What is a salt? (O level chemistry)

What is a salt? A salt is a substance formed when the hydrogen of an acid is replaced by a metal. Three common ways of making a salt: When an acid neutralise a base or an alkalis. For example, sulphuric Read more…

## Writing ionic equations

Writing ionic equations Writing ionic equations is one of the most challenging aspects of O level chemistry. Topics such as Redox and electrochemistry required the student to have detailed information on how to write ionic equations. Also as the student Read more…

## Writing Balanced Chemical Equations

Writing Balanced Chemical Equations Writing balanced chemical equations is one of the most challenging aspects of O level chemistry. O level Chemistry fundamentally revolves around calculations, symbols and formula of chemical substances. This tutorial is about balancing chemical equations but Read more…

## Physics laws and formulae (O level)

Physics laws and formulae (O level) This list is a list of physics laws and formulae used in O level physics. Kinematics $latex average\ speed = \frac{total\ distance\ moved} {time\ taken}$ \$latex velocity = \frac{distance\ moved\ in\ a\ specified\ direction} Read more…

## Waves and Optics Summary Notes (O level Physics)

Waves and optics summary (O level Physics) A wave is a periodic disturbance that transmit energy from one point to another. There are two types of waves: Transverse waves – in which the vibrations are perpendicular to the direction of Read more…

## Proving Trigonometrical Identities (A level)

Proving Trigonometrical Identities (A level) Proving trigonometrical identities requires you to use mathematical and logical steps to prove that one side of the identity can be simplified into the other side of the equation. Logically you cannot work from both Read more…

## Chemistry Calculations (O level)

Chemistry calculations (O level) This post is about answering O level chemistry calculations questions which are part of stoichiometry. To fully understand these calculations you should be familiar with: how to use the periodic table relative molecular mass molar mass Read more…

## Projectiles Revision

Projectiles Revision In these questions, take g to be 10m/s2 Question 1 A particle is projected with a velocity of 30 m/s at an angle of arctan(0.75) to the horizontal. It hits the ground at a point which is level Read more…

## Combined Science Questions (Page 2)

Combined Science Revision Solution 1 Air is cooled to -78°C. Water and carbon dioxide are removed as solids. The remaining air is further cooled by a process of rapid compression and expansion until it reaches a temperature of -200°C. At Read more…