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GUIDELINES FOR THE SCHOOLED ASSESSMENT RATIONALE Schooled Assessment (SBA) is an integral part of student assessment in the course covered by this syllabus. It is intended to assist students in acquiring

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1. Students preparing for the CSEC chemistry examination may need the online specimen to practice and familiarize themselves with the required format and types of questions.
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3. It can be useful for academic institutions or schools offering CSEC chemistry courses to incorporate the online specimen as part of their curriculum or exam preparation materials.

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Welcome to another episode of Terrace notes, and today we are going to be looking at acids and bases an acid is substance that produces H+ ions in aqueous solution okay, so you need to Beadle to give a definition for an acid south#39’s simply a substance that produces H+ions in aqueous solution and an H+ ions essentially a proton alright because hydrogen is one mass number is one atomic number one which means we have one electron present, and we have one proton present, and we have zero neutrons therefore if we have on each plus ion it means that the hydrogen atom has lost an electron so what we are left with is one proton, so that is why sometimes we have seen acid being defined as a proton donor some basic properties of an acid they have a sour taste they turn blue litmus red litmus is an indicator acids are corrosive, and they also conduct electricity alright, so these are just some basic properties of acids those of you who have ever tasted an orange or lime it is acidic right it is sad it has sour TO#39’s and okay an acid anhydride wood and hydrous means without water okay so once we see the wood anhydrous it means without water pure anhydrous acids are composed of covalent molecule sand and pure and hydrous acids can weather solid liquid or a gas in the case of a solid an example is citric acid an exam another example is ascorbic acid chichis really vitamin C an example of an anhydrous liquid acid is nitric acid and phosphoric acid in the case of a gas the examples are sulfur dioxide and nitrogen dioxide an acid anhydride is an acidic oxide of a nonmetal which reacts with water to form an acid, so we just need to be able to give a definition for an acidanhydrideso we said anhydrous means without waters an acid anhydrides an acidic oxide of a non-mature metal which reacts with water to form an acid now what is a piece a base is substance which will react with an acid to form a salt and water only okay Thais a definition that you need to learn an example of a base is ammonia another example would be metal oxides and hydroxides for example magnesium oxidase Abby#39’s couple of two hydroxide Isabel#39;SSO most metal oxides and hydroxides earpieces, so we have something called an alkali and alkaline is a base that insoluble in water an alkali produces a h-in aqueous solution now remember an acid produces H+ ions in the case of an alkali it produces Oh H minus ions in aqueous solution examples if we take sodium hydroxide solid and reacted with water or dissolve it in water we end up with any plus ions and which minus ions, so we see that we have h minusions being produced if we take sodium oxide and reactor water we get sodium ions and beget which minus ions again in the case of ammonia plus water produces NH 4 plus ions which is the ammonium ion and which minus ions some notice in all of these we're reproducing h minus ions, so an alkali is simply a piece that is soluble in water now we already said that an alkaline substance that produces...

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CSEC Chemistry Specimen online is a platform where candidates can practice and familiarize themselves with the type of questions that may appear on the CSEC Chemistry exam.

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The purpose of CSEC Chemistry Specimen online is to help candidates practice and assess their knowledge and understanding of the subject before the actual exam.

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