Educational Blog Spot

What Is Molarity? Molarity is the most commonly used measure of concentration. It is expressed as the number of moles of solute per liter of solution. For example, a 1 M solution of H2SO4 contains 1 mole of H2SO4 per liter of solution. H2SO4 dissociates into H+ and SO4- ions in water. For every mole of H2SO4 that dissociates in solution, 2 moles of H+ and 1 mole of SO4- ions are formed. This is where normality is generally used. What Is Normality? Normality is a measure of concentration that is equal to the gram equivalent weight per liter of solution. Gram equivalent weight is a measure of the reactive capacity of a molecule. The solution's role in the reaction determines the solution's normality. For acid reactions, a 1 M H2SO4 solution will have normality (N) of 2 N because 2 moles of H+ ions are present per liter of solution. For sulfide precipitation reactions, where the SO4- ion is the most significant factor, the same 1 M H2SO4 solution will have a normality of 1 N. Con...

A solution is a homogeneous mixture created by dissolving one or more solutes in a solvent. The chemical present in a smaller amount, the solute, is soluble in the solvent (the chemical present in a larger amount). Solutions with accurately known concentrations can be referred to as standard (stock) solutions. Method: The solid solute is weighed out on weighing paper or in a small container and then transferred directly to a volumetric flask (commonly called a "vol flask"). A funnel might be helpful when transferring the solid into the slim neck of the vol flask. A small quantity of solvent is then added to the vol flask and the contents are swirled gently until the substance is completely dissolved. More solvent is added until the meniscus of the liquid reaches the calibration mark on the neck of the vol flask (a process called “diluting to volume”). The vol flask is then capped and inverted several times until the contents are mixed and completely dissolved. The disadvanta...

Write types of hazards. How general laboratory safety measures help keep safe from hazards? Answer: Types of hazards: Chemical Hazards A chemistry laboratory presents the greatest combination of potential hazards. However, careful attention to techniques and the avoidance of known dangers can help to make this area as safe as any other. Biological Hazards Laboratories used for teaching biology present the teacher with a wide range of insidious hazards. Besides hazards specific to biological work, dangers can arise from the presence in the laboratory of animals, micro-organisms, and plants. Because a possible hazards often does not make itself obvious until several days after infection, biological work must be treated as a special case. Radiation Hazards Each year seems to bring more and more items of equipment into the teaching laboratory that only a short while ago were confined to research laboratories. Fire Hazards M ost books dealing with fires and fire prevention make the point t...

What do you know about the term misconception? As a science teacher how will you improve misconceptions of the science concepts? Misconception A misconception is a conclusion that's wrong because it's based on faulty thinking or facts that are wrong. Your accusation about your brother's role in that unfortunate event at your party may be based on a misconception. First appearing in the 1660s, the noun misconception comes from the prefix mis-, meaning "bad, wrong," and the word conception, meaning "act of conceiving." A misconception usually results from incorrect thinking or a flawed understanding. Because they don't know the facts, many people have a misconception about how diseases such as AIDS are transmitted. It's a common misconception that Thomas Edison invented the light bulb, when, in fact, he didn't. As a science teacher how will you improve misconceptions of the science concepts? MISCONCEPTION: Students will automatically learn...

The 5 E lesson supports inquiry-based instruction. It allows children to make discoveries and to process new skills in an engaging way. Teachers can also adequately plan power objectives more effectively by using the 5E process. Children are not just learning with this method, they are more knowledgeable about their own metacognition because they are coached along and not dictated by teachers merely lecturing. The role of the teacher is to facilitate and support students as they use prior knowledge to build new knowledge. The 5 Es are:  Engage  Explore  Explain  Elaborate  Evaluate DETAILED LESSON PLAN IN SCIENCE VI OBJECTIVES At the end of the lesson, the pupils are expected to: a) Identify the effects of human activities and the cycles in an ecosystem. b) Illustrate the cycle in an ecosystem c) Give importance to the ecosystem LEARNING CONTENT TOPIC: Human Activities and the Cycles in an Ecosystem MATERIALS: Charts, Pictures REFERENCE: Science and Health 6, pp.84-87 PRESENTATI...