<h1><strong>CHANGES IN NON-LIVING THINGS</strong></h1> CONTENT <ol> <li>Types of Changes in Non-living Things</li> </ol>   <h2><strong>Types of Changes in Non-living Things</strong></h2> Non-living matter undergo changes i.e they can be made to change from one state to another. They can be made to form new substances. Changes in non-living things can be classified into physical changes and chemical changes.   <h2><strong>Physical Changes</strong></h2> Physical changes are changes in which no new substances are formed. A physical change is a temporary change, It is reversible. The composition of the new substance does not change when undergoing a physical change. Examples are: 1. Melting of candle wax. 2. Dissolution of salt in water to form a salt solution. Salt + Water <img class="alignnone size-full wp-image-14541" src="https://classhall.com/wp-content/uploads/2018/03/single-arrow.jpg" alt="right pointing arrow" width="77" height="7" /> Salt solution 3. All changes in state of matter are physical changes. Such as, vapourization of liquid to gases.

<h1><strong>INTRODUCTION TO SCIENCE </strong></h1> CONTENT <ol> <li>Definition of Science</li> <li>How to Study Science</li> <li>The Branches of Science</li> <li>Uses of Science</li> </ol>   <h2><strong>Definition of Science </strong></h2> Science is the systematic study of nature. Basic science is a subject that introduces sciences to mankind. <h2><strong>How to Study Science </strong></h2> Science is studied through the following ways:

<h1>CHEMICALS</h1> CONTENT <ol> <li>Meaning of Chemicals</li> <li>Classification of Chemicals</li> <li>Chemical Safety</li> </ol>   <h2>Meaning of Chemicals</h2> Chemicals are substances with specific molecular composition. A chemical can be in form of gas, liquid, or solid. It can also be in simple or complex form. They can be in form of element, compound, and mixtures. <p style="text-align: center;"><img class="size-full wp-image-19641 aligncenter" src="https://classhall.com/wp-content/uploads/2018/06/mercury.jpg" alt="Mercury" width="353" height="228" /><strong>Mercury</strong></p> <span style="color: #008000;">Chemical elements are basic substances that are often used to make other products. Mercury is one of the few elements that are liquid at room temperature. This element is poisonous and can be absorbed through the skin.</span> <h2>Classification of Chemicals</h2> <h3>Classification Based on Uses</h3> <ol> <li>Pharmaceutical chemicals</li> <li>Nuclear chemicals</li> <li>Agrochemicals</li> <li>Industrial chemicals and</li> <li>Laboratory chemicals.</li> </ol> 1.<strong> Pharmaceutical Chemicals: </strong>They are chemicals formulated to act as remedy on living cells, they could be herbal or chemical synthesis. They are used for making of drugs. Such as antibiotics, antiseptics etc. 2.<strong> Nuclear Chemicals:</strong> They are chemicals that function based on the activities within the nucleus. Some of these chemicals can split or disintegrate (decay) through the process of radioactivity. It can be used for positive or negative purpose. E.g. it is used during X-ray. 3.<strong> Agrochemical:</strong> These are chemicals used for agricultural purposes. Examples are pesticides, herbicides, fertilizers, and organic manure.

<h1><strong>FAMILY HEALTH - SANITATION</strong></h1> CONTENT <ol> <li>The Meaning of Sanitation</li> <li>Types of Sanitation</li> <li>How to Carry Out Personal Cleanliness</li> <li>Advantages of Observing Personal Cleanliness</li> <li>Disadvantages of Not Observing Personal Cleanliness</li> <li>The Importance of Sanitation</li> </ol>   <h2><strong>The Meaning of Sanitation</strong></h2> Sanitation is the removal of all kinds of waste that could be considered unpleasant from our immediate environment, in order to keep ourselves and our environment clean and healthy. <h2><strong>Types of Sanitation</strong></h2> The types of sanitation are as follows: (i) <strong>Environmental Sanitation:</strong> This refers to the practice or ways of keeping our surrounding clean and healthy by removing all kinds of waste from our rooms, toilets, bathrooms, kitchens and surroundings such as markets, schools etc. (ii)<strong> Personal cleanliness:</strong> This is the keeping of one’s body and personal belongings neat, clean and tidy always. Personal cleanliness is important for health because it prevents very tiny organisms (micro-organisms) which can cause diseases.   <h2><strong>How to Carry Out Personal Cleanliness</strong></h2> We can carry out personal cleanliness by doing the following: