Course Content
Matter
OBJECTIVES By the end of this topic, the trainee should be able to 1.Define matter 2.Explain state of matter 3.Distinguish between physical and chemical changes 4.Explain the gas laws
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Atoms , Elements and Compounds
OBJECTIVES By the end of this topic , the trainee should be able to; 1.Define Elements, Compounds and Mixtures 2.Describe the structure of an atom 3.Describe how to determine the Atomic number ,Mass number and Isotopes
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The Periodic Table
OBECTIVES By the end of this topic, the trainee should be able to : 1.State the historical contribution on development of the periodic table 2.Explain the periodic trends of elements and their compounds 3.State the diagonal relationships of the periodic table
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The S-Block Element
OBJECTIVES By the end of this topic, the trainee should be able to: 1.Explain the chemistry of group I and II elements 2.State the application of group I and two elements and their compounds
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Chemical Bonds
OBJECTIVES By the end of these topic, the trainee should be able to 1.Identify different types of bonds 2.Describe their properties
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Chemical Equilibrium
OBJECTIVES By the end of this topic , the trainee should be able to : 1.Define chemical equilibria 2.Explain types of equilibria 3.Determine equilibrium constant 4.Describe factors affecting chemical equilibrium
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Introduction To Organic Chemistry
By the end of this topic , the trainee should be able to : 1.Explain the aspects of organic chemistry 2.Describe hydrocarbons 3.Classify organic molecules explain chemical reactions of simple organic molecules 4.Explain the properties , synthesis and uses of simple organic molecules
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Acids, Bases and Salts
OBJECTIVES By the end of this session , the trainee should be able to : 1.State properties of acids and bases 2.Differentiate between strong and weak acids 3.Explain types and properties of salts
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PH Analysis
OBJECTIVES By the end of this topic, the trainee should be able to: 1.Define the term PH 2.Explain the basic theory of PH 3.State the relationship between PH and color change in indicators 4.Explain the term buffer solution 5.Describe the preparation of buffer solutions 6.State the application of buffer solutions
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Sampling and Sample Preparation
OBJECTIVE By the end of this topic, the trainee should be able to : 1.Define the terms used in sample preparation 2.State the importance of sampling 3.Describe the techniques of sampling 4.Describe the procedure for sample pre-treatment 5.State sample storage methods
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Separation Techniques
OBJECTIVES By the end of this topic , the trainee should be able to : 1.Define separation, extraction and purification 2.Describe the separation , extraction and purification techniques 3.Explain the methods of determining purity of substances
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Heating and Cooling Techniques
OBJECTIVES To identify various techniques used for heating and cooling substances in the laboratory
Heating and Cooling Techniques
OBJECTIVES To identify various techniques used for heating and cooling substances in the laboratory
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Distillation Techniques
By end of this topic, Trainee should be able to : 1. Define distilation 2. State and explain various distillation techniques 3. Outline Various distillation techniques 4. Outline the applications of Distillation techniques
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Crystallization Techniques
OBJECTIVES By the end of the topic, the learner should be able to: 1.To define crystallization 2.To describe crystallization process 3.To carry out crystallization procedure
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Solvent Extraction Techniques
OBJECTIVES By the end of the topic, the learner should be able to 1.Define solvent extraction 2.Explain terms used in solvent extraction 3.Describe methods of solvent extraction 4.Describe selection of appropriate solvents for solvent extraction 5.Determine distribution ration 6.Outline factors actors influencing the extraction efficiency 7.Describe Soxhlet extraction
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Chromatography Techniques
OBJECTIVES By the end of this topic, the learner should be able to: 1.Define chromatography techniques 2.Explain terms used in chromatography techniques 3.Describe principles of chromatography techniques 4.Explain types of chromatography techniques 5.Carry out chromatography experiments 6.Determine RF factor 7.Outline electrophoresis
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Titrimetric Analysis
OBJECTIVES By the end of this topic, the trainee should be able to: 1.Define terms used in titrimetric analysis 2.Describe types of titrimetric analysis 3.Balance chemical reactions 4.Work out calculations involved in titrimetric analysis
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Redox Titration
Redox Titration is a laboratory method of determining the concentration of a given analyte by causing a redox reaction between the titrant and the analyte. Redox titration is based on an oxidation-reduction reaction between the titrant and the analyte. It is one of the most common laboratory methods used to identify the concentration of unknown analytes. Redox reactions involve both oxidation and reduction. The key features of reduction and oxidation are discussed below.
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Complexiometric Titration
omplexometric Titration or chelatometry is a type of volumetric analysis wherein the colored complex is used to determine the endpoint of the titration. The method is particularly useful for determination of the exact number of a mixture of different metal ions, especially calcium and magnesium ions present in water in solution .
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Gravimetric Analysis
OBJECTIVES By the end of this topic, the trainee should be able to: 1.Define gravimetric analysis 2.Describe the principles of gravimetric analysis 3.Describe the steps involved in gravimetric analysis 4.Explain factors affecting gravimetric analysis 5.Describe the equipments and apparatus used in gravimetric analysis 6.Carry out gravimetric analysis
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Calorimetric Analysis
OBJECTIVES By the end of this topic, the trainee should be able to: 1.Define terms and units used in thermochemistry 2.Determine enthalpy changes in chemical reactions 3.Determine heat capacity and specific heat capacity 4.Compare calorific values of different materials 5.Determine different heat reactions 6.Apply law of conservation of energy and Hess law in thermochemical calculations
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Chemistry Techniques for Science Laboratory Technicians
About Lesson

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INTRODUCTION

Calorimetric analysis is a technique used to measure the amount of heat involved in a chemical or physical process. It involves the use of a calorimeter, which is a device designed to accurately measure heat changes.

Calorimetric analysis is based on the principle of energy conservation, which states that energy cannot be created or destroyed, only transferred or converted from one form to another. By measuring the heat changes associated with a process, calorimetry allows us to determine various thermodynamic properties, such as heat capacity, enthalpy change, and heat of reaction.

Although, the energy is not destroyed nor created in either of the cases; the total energy of the universe remains constant at all times;

Energy just transfers from one place to another;

There are 2 types of reactions:

  1. Exothermic– heat is released during the reaction;  If the energy is lost during the reaction, it is an exothermic reaction – meaning that the energy gives the energy to its surroundings. As a result, the temperature is increased; therefore, the heat is released in the reaction;
  2. Endothermic – heat is absorbed during the reaction. If the energy is gained during the reaction, it is an endothermic reaction – meaning that the reaction gets the energy from its surroundings. In such cases, we have to provide energy (usually in a form of heat) which can be absorbed during the reaction for the chemical process to occur. 

Let’s consider the energy level diagrams (also referred to as the reaction profiles) for exothermic and endothermic reactions:

As you can see, in the case of exothermic reaction, products at the beginning of a reaction have high potential energy and the energy is decreased as the reaction progresses. The difference between the energies of reactants and products is the energy that is released during the reaction.  But still, there is a minimum energy required for a reaction to progress. This minimum energy is referred to as the activation energy

Endothermic reaction is the opposite of exothermic reaction that we have just discussed. In the case of endothermic reaction, reactants have very low potential energy; therefore, they need the input of energy (activation energy) for the reaction to progress. As a result, the products that are obtained in a reaction have high potential energy. The difference between the energies of reactants and products is the energy that is absorbed during the reaction. 

Thermal Energy, Temperature, and Heat

Thermal Energy is a form of kinetic energy associated with the random motion of atoms and molecules. Increasing the amount of thermal energy increases the temperature of the system and vice versa. 

The transfer of thermal energy between two borders with different temperatures is referred to as Heat (q). Transfer of heat always occurs from a subject with higher kinetic energy to subject with lower kinetic energy. 

Energy is measured in units of Calories (cal). 1cal is the amount of energy required to increase the temperature of 1g of water by 1oC or 1K.

The SI unit of heat, work, and energy is the Joule (J). 1J is the amount of energy used to move an object for 1meter with a force of 1newton. 

1cal = 4.184J

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