The Root Bridge

The topic of mass, weight and density is very important in GCE O Level physics because this topic contains some really useful concepts.  So, let's start (from the beginning) without further introductions and let me explain these terms, like "mass" and "weight" to you in detail.  Before understanding the concept of mass and weight, you have to remember that these two quantities, mass and weight, and not similar. How are they different? Let me tell you.  What is mass?  Mass refers to the amount of matter in a body. In other words, mass is the quantity of matter in a body. Since this quantity does not change with the location or shape, mass remains the same everywhere.  For example, your mass on the earth and mars will be the same because the location will not affect the "quantity of matter" of a body.  Mass is measured in various units but the SI (international system of units) is the kilogram (kg). However, other units such as gram (g) are ...

Enzymes are those chemical (biological) catalysts that speed up a chemical reaction and they remain unchanged at the end of a reaction.  However, this definition is not enough to meet the requirements of your syllabus about enzymes notes. So, let's start from the very beginning without further introductions.  What are Enzymes?  There are several reactions that require very strong heat to undergo completion. It is not feasible (commercially) to meet all conditions for some reactions.  As a result, catalysts are used to speed up (or alter) these reactions. It is to note that enzymes are organic catalysts usually made up of proteins and their primary function is to speed up slow reactions.  There are several reactions in our everyday life in which enzymes play a very vital role. Let's take a look at some examples to understand the use of enzymes.  The Application of Enzymes : In our body, many complex substances are broken down into simpler ones.  For ex...