ALKYNES
An alkyne is a molecule made up entirely of carbon and hydrogen where on or more carbon atoms are connected by triple bonds. The general formula for an alkyne is CnH2n-2 where n is the number of carbon […]

Introduction
Sometimes we do not need to measure of calculate things exactly. We may only wish to have a rough idea, or to calculate only to a certain degree of accuracy. It is in such cases we talk of decimal […]

The New Year is a time for both reflecting on the past year and setting goals for the year ahead. No matter what happened during the past year, the New Year is a time when everyone gets a second chance. If you had […]

Definition of Projectile Motion: A projectile is anybody that is thrown or projected. In other words, a projectile is an object upon which the only force acting is gravity. The projectile motion has two elements: […]

Sum and difference
The sum of a set of numbers is the result when the numbers are added together.
Example
The sum of four consecutive numbers is 58. Find the numbers.
Let the numbers be n, n+ 1, n + 2, n + […]

Concepts of Time
Time itself can be defined as that in which developments and happenings can be distinguishably analyzed with reference to before and after.
In the International System of Units (SI), the unit of […]

Adding and subtracting directed numbers
Numbers can be shown on a number line which extends above and below zero. This gives positive and negative numbers.

The signs + and – show the direction from 0. P […]

Coulombs Law
The electric force between two point charges is directly proportional to the magnitude of each charge (q1, q2), inversely proportional to square of the separation between their centers (r), directed […]

Definition of Cellular Respiration
Cellular respiration refers to the biochemical pathway by which cells release energy from the chemical bonds of food molecules and provide that energy for the essential […]

Introduction
The most important classification in chemistry is the arrangement of the elements in the periodic table.
In 1869, Mendeleev, a Russian scientist, was the first to construct a periodic table. He […]

Factors, Prime factors (revision)
40 ÷ 8 = 5 and 40 ÷ 5 = 8
8 and 5 divide into 40 without remainder.
8 and 5 are factors of 40.
A prime number has only two factors, itself and 1, but 1 is not a prime nu […]

Introduction to Advertising
Advertising is concerned with giving publicity to the existence of goods and services by focusing attention on facts such as features, uses, benefits, etc, about the goods and services […]

Position, Distance, Displacement, Speed, Velocity and Distance-Time graph
The position of a point in space is determined by its distance and direction from other points. The statement of position is accomplished […]

Introduction
The tangent is one of the three basic trigonometric functions, the other two being sine and cosine. These functions are essential to the study of triangles and relate the angles of the triangle to […]

Amino Acids
Amino acids are organic compounds which contain both an amino group and a carboxyl group, that is, any of a group of organic molecules that consist of a basic amino group (−NH2), an acidic carboxyl g […]

Introduction
Carbohydrates (saccharides) – Molecules consist of carbon, hydrogen and oxygen atoms. A major food source and a key form of energy for most organisms. When combined together to form polymers, […]

To remember something new, it must be clearly impressed in the brain. It requires time and effort to learn new concepts. To imprint new information into the brain, it’s important to schedule periodic study s […]

Rounding off numbers
To ’round off’ or ‘approximate’ a number to a desired degree of accuracy, we

round the number up if the next digit is 5 or more
round the number down if the next digit is less than […]

Introduction
The method of solving “by substitution” works by solving one of the equations (you choose which one) for one of the variables (you choose which one), and then plugging this back into the other […]