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Introduction to Chemistry

INTRODUCTION TO CHEMISTRY

Welcome to Chemistry for form one. Join us as we explore different substances, their properties and composition. There are various topics we are going to study in the course of our learning. These include:

OBJECTIVE

By the end of the lesson you should be able to

recall scientific concepts related to chemistry learned in primary schools.

Click to view the video on the role of Chemistry in the society.

REVIEW OF TOPICS LEARNT IN PRIMARY SCHOOL

Welcome to our first lesson. In this lesson we are going to look at topics which we learnt in Primary school which relate to Chemistry.

What happens when water in a container is poured into a measuring cylinder?

What does the experiment show?

This experiment shows that water has no shape. water flows. water has volume.

In nature we have different substances. All these substances and materials are found in different forms. These forms are solids, liquids and gases. Scroll down to observe some of these substances.




 

OBJECTIVE

By the end of this lessson you should be able to

relate the knowledge learnt in primary school to what we are going to study in Chemistry.
 

QUIZ

What happens when a small stone is dropped into a measuring cylinder containing water? Observe the following animation.

Building materials

Toothpaste

Bottles

Friuts

What happens when a syringe with a known volume of air is connected to a balloon and the piston of the syringe is used to transfer air into the baloon.?

 

This shows that air occupies space and has volume.

What happens when an empty beaker and a beaker containing water are placed on a beam balance?

The side with the beaker containing water moves down.This shows that water has mass.

CONCLUSION ON VOLUME

From the experiments done it is evident that substances have mass and occupy space.Matter can be defined as anything that occupies space and has massThese forms of matter are referred to as states of matter.

Examples of States of Matter

ACTIVITY

MIXTURES

From Primary school you also learnt that a mixture consists of two or more substances combined.

Mixtures can be separated using different methods

CONDUCTORS AND NON CONDUCTORS

Some substances conduct electricity while others do not:

A simple electric circuit can be used to test whether a substance is a conductor or non conductor.

 

 

DRUGS

At home when we feel unwell or sick we take substances known as Drugs

A drug is a chemical substance which is introduced into the body to cause a curative or pleasurable effect.
Medical drugs are introduced to prevent or cure (treat) diseases or to reduce their symptoms.
Some drugs can be prescribed by a qualified doctor and others are not. Those that are prescribed by the doctor are known as prescribed drugs while the others are non-prescribed drugs (also known as Over-the-Counter (OTC) drugs).The common OTC drugs include painkillers such as aspirin and Paracetemal, anti-acids and a variety of cold and flu remedies.Therefore, the doctor gives the exact amount of the drug to be taken at a specific time. This is then referred to as dosage. Over-dosing or Under-dosing one may lead to serious health problems such as death.Other drugs are commonly abused .
 

COMMONLY ABUSED DRUGS

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Therefore drug abuse is the use of a drug for any purpose other than which it is intended. Drugs if abused have different effects.

Therefore drug abuse is the use of a drug for any purpose other than which it is intended.

Drugs if abused have different effects.

COMMONLY ABUSED DRUGS

ACTIVITY

Our enviroment consists of materials and substances. All these are produced through various processes.Scroll down to observe some of these substances.

CHEMISTRY AND SOCIETY

Background knowledge
At primary school level, we learnt science as a general subject. At secondary

level the study of science is split into three main subjects. These are: Physics,

Biology and Chemistry.

 

OBJECTIVES

By the end of the lesson you should be able to

appreciate what the study of Chemistry is all about.

QUIZ

Chemistry is a branch of science which deals with the study of the composition and properties of matter

In this definition,

Composition refers to what a substance is made of.

Properties refers to how a substance behaves and how their state changes from one form to another under certain conditions

APPLICATIONS OF CHEMISTRY

Chemistry has contributed to the understanding of our environment through various processes. Various processes are studied.Scroll down to observe some of these processes.

The study of Chemistry can lead to the following jobs (Profession): Scroll down to observe some professsions that one can pursue.

Observe other professions in the following pages.

Click to play the video to observe a chemistry teacher.

Click to play the video to observe a beautician.

These are some of the professions in Chemistry. Therefore, students who study and perform well in chemistry may choose any of these careers

COMMON LABORATORY APPARATUS AND EQUIPMENT

Reagent bottles and wash bottles

 


Fire Extinguisher

 

LABORORATORY APPARATUS

Background knowledge

In primary science you carried out experiments using the

following apparatus and equipments. These included

Reagent bottles
 


Water trough and gas jar

Spirit burner

Stove

Thermometer

Metalic container

Weighing equipment

ACTIVITY 1

OBJECTIVES

By the end of the lesson you should be able:

a.Name some common apparatus in the chemistry laboratory.

b.State the uses of each of the apparatus.

c.Describe parts of a Bunsen burner and its flames.
 

QUIZ

CHEMISTRY LABORATORY

Chemistry is studied by performing experiments which are carried out in

a special room called a laboratory.The laboratory consists of different sections.

Click on the movies below to view the different sections of the laboratory

Apparatus can be classified according to their uses in the laboratory.
These include;

Apparatus for heating.

Spirit Burner



 

Portable gas Burner

Apparatus for Measuring Volume

Measuring Cylinders

Apparatus for Measuring Temperature

Thermometer

Apparatus for Measuring time

Stop-watch

Measuring mass

Click to play the video to observe how mass is measured in a laboratory

LABORATORY APPARATUS AND THEIR USES

Various apparatus are used for different purposes in the laboratory. Roll over an apparatus to find out its name and its use.

Various apparatus are used for different purposes in the laboratory. These include

TEST TUBE- used for general laboratory apparatus

BUNSEN BURNER

The most commonly used source of heat in the laboratory is the Bunsen burner.The bunsen burner has different parts. Click to play the video to view the different parts of the bunsen burner.

Parts of Bunsen burner

 

 

 

 

Functions of the different parts of the bunsen burner

Base- for supporting the bunsen burner

Rubber tubing- connect laboratory gas to the burner

Collar- Regulates the amount of air that enters the chimney

Chimney- Allows the lab gas mixes with air

Air hole- Allows entry of air into the chimney.

BUNSEN BURNER

The most commonly used source of heat in the laboratory is the Bunsen burner.

The bunsen burner has different parts.

Click on the video clips below to observe the flames produced by a bunsen burner

 

GAS PIPE

GAS PIPE CONNECTED TO BURNER

JET

GAS TUBE ENTRANCE

BASE PLATE

CHIMNEY

BUNSEN BURNER CONNECTED TO GAS TUBE

BUNSEN BURNER CONNECTED TO GAS TAPE

The Bunsen burner produces two types of flames.

The luminous flame is produced when the air hole is closed while

non luminous flame is produced when the air hole is open.Click to play the video below to observe the luminous flame.

When the air hole is closed air does not enter the chimney leaving only the fuel gas burning with a yellow flame (Luminous). A luminous flame gives out light. This is because of the tiny particles of hot carbon (soot) giving out a yellow light.

The luminous flame is formed by incomplete combustion.

A luminous flame is sooty, bright, less hot and is used for lighting purposes.

 

 

A non luminous flame is produced when the airhole is open.

Play the video to observe the non luminous flame

When the air hole is open fuel gas mixes with air before burning making it burn more quickly and completely with a blue flame. Carbon particles do not form, therefore the flame, gives out little light and is called non luminous flame.A non luminous flame is used for heating purposes.Observe the differences .

LABORATORY SAFETY RULES

To avoid accidents in the laboratory there are laboratory practices.

These include


 
  • Never taste or eat anything in the laboratory.

  • Do not perform any unauthorized experiments.

  • Always keep flammable substances away from the fire.

  • If an acid is spilled, wash it off immediately with plenty of water.

  • Put off all flames when not in use.

INTRODUCTION TO CHEMISTRY

Welcome to Chemistry for form ones. Join us as we explore different substances, their properties and composition. There are different topics we are going to study in the course of our learning. This includes,

 



 Introduction to Chemistry 

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 Introduction to Chemistry  

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 Introduction to Chemistry 




sit amet congue Mock Past Papers, give you an actual exam situation in readiness for your forthcoming national examination from the Kenya National Examination Council KNEC

Choosing the KCSE mock examination revision material saves you a lot of time spent during revision for KCSE. It is also cost effective sapien. 

Choosing the KCSE mock examination revision material saves you a lot of time spent during revision for KCSE. It is also cost effective sapien. 

 




 e-Content 

Buy e-Content Digital CD covers all the topics for a particular class per year. One CDs costs 1200/-


click to play video

Purchase Online and have the CD sent to your nearest Parcel Service. Pay the amount to Patrick 0721806317 by M-PESA then provide your address for delivery of the Parcel.. Ask for clarification if in doubt,





























Candidate benefit from our quick revision booklets which are comprehensive and how to tackle examination question methods
We have an enourmous data quiz bank of past papers ranging from 1995 - 2017 


KCSE ONLINE WEBSITE provide KCSE, KCPE and MOCK Past Papers which play a great role in students� performance in the KCSE examination. KCSE mock past papers serves as a good motivation as well as revision material for the major exam the Kenya certificate of secondary education (KCSE). Choosing the KCSE mock examination revision material saves you a lot of time spent during revision for KCSE . Choosing the KCSE mock examination revision material saves you a lot of time spent during revision for KCSE. It is also cost effective

MOCK Past Papers


As a student, you will have access to the most important resources that can help you understand what is required for you to sit and pass your KCSE examination and proceed to secondary school or gain entry to University admission respectively. 

www.kcse-online.info


KCSE ONLINE

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KCSE ONLINE WEBSITE provide KCSE, KCPE and MOCK Past Papers which play a great role in students� performance in the KCSE examination.

Choosing the KCSE mock examination revision material saves you a lot of time spent during revision for KCSE. It is also cost effective 

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sit amet congue Mock Past Papers, give you an actual exam situation in readiness for your forthcoming national examination from the Kenya National Examination Council KNEC

Choosing the KCSE mock examination revision material saves you a lot of time spent during revision for KCSE. It is also cost effective sapien. 

Choosing the KCSE mock examination revision material saves you a lot of time spent during revision for KCSE. It is also cost effective sapien. 




As a supplementary to coursework content our e-library for digitized multimedia CDs while enhance and ensure that you never missed that important concept during the normal class lessons. It is a Do it Yourself Project..

Candidates who would want their papers remarked should request for the same within a month after release of the results. Those who will miss out on their results are advised to check with their respective school heads and not with the examination council

For Best results INSTALL Adobe Flash Player Version 16 to play the interactive content in your computer. Test the link below to find out if you have Adobe Flash in your computer. 


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