07X1VW5 I‚ 2013 SUMMATIVE ASSESSMENT – I‚ 2013 / SCIENCE IX / Class – IX 3 90 Time Allowed : 3 hours Maximum Marks : 90 General Instructions : The question paper comprises of two Sections‚ A and B. You are to attempt both the sections. All questions are compulsory. All questions of Section-A and all questions of Section-B are to be attempted separately. 1 3 Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in one word or in one sentence. 4 6 30-30 Question
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crystallization. Crystallization is the process of purifying a substance‚ with the most adequate solvent. The process of crystallization came to be based on the principle of solubility. First‚ we must choose a solvent. The solvent is crucial to crystallization because it’s what will allow impurities to dissolve. Therefore‚ when selecting a solvent it is important that it does not cause a chemical or flammable reaction to the substance. Then‚ we continue with the process until the solution is ready
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Investigatory Project Marc Reian Azcune Nicole Cyril Guiller Kireina Saliendras Glendell Bringino Jethro Benedicto Camilla Ricarto Laurence Pido Franz Santos Rhea Legada Rojay Retes ACKNOWLEDGEMENT First of all the researchers would like to thank to their Science teacher Ms. Aira T. Velasquez for teaching them and helping them to do this Investigatory Project also giving us knowledge for us to understand every problem that has made in our I.P. The researchers would like to thank also
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During their childhood‚ kids use a large amount of glue. Most of them are chemical mixtures with no ingredients listed on the packaging. You can only imagine what’s in there. Preschoolers love pasting and collage‚ as well as tasting anything that comes close to their mouths. Besides the awful taste‚ shop bought glue might not be the perfect substance for their tummies. School kids have (hopefully) learned not to lick the glue‚ but having it on their skin and‚ occasionally‚ all over them‚ isn’t good
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physical and chemical properties. Such as; different boiling points‚ melting points and their solubility properties. To do this a chemist can also asses the differences between acidic and basic substances when they are added to water soluble mixtures. Within this current experiment I will asses the pharmaceutical preparation of Panacetin‚ by using it ’s solubility along with other organic molecules. We know that Panacetin is made up of sucrose‚ aspirin and some other unknown substance. We know the
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given mixture that contains iron filings‚sand‚salt and small stones? Background There are things that must be understood before doing this lab. The first thing that must be understood is a mixture. A mixture has two or more pure substances‚ and the substances keep their chemical compositions (study.com).The next thing to apprehend is filteration. Filtration is a method used to separate a solid that isn’t dissolved in water. Another method is magnetic separation. Magnetic separation is used when there
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bDATES PERFORMED: JANUARY 8‚ 2013 CHEMICAL EQUILIBRIUM D.M. TAN1 AND P.B. ALEGRO2 1DEPARTMENT OF MINING‚ METALLURGICAL‚ AND MATERIALS ENGINEERING‚ COLLEGE OF ENGINEERING 2 INSTITUTE OF CHEMISTRY‚ COLLEGE OF SCIENCE UNIVERSITY OF THE PHILIPPINES‚ DILIMAN QUEZON CITY‚ PHILIPPINES RECEIVED JANUARY 15‚ 2013 RESULTS AND DISCUSSION A. Iron- Silver Equilibrium The first part of the experimentation focuses in the iron-silver system. Silver nitrate (AgNO3) was added to ferrous
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Physical and Chemical An altogether diverse viewpoint is carried into center as we think as of a portion of the natural perils that go hand in hand with streamlined development and concentrated farming. A portion of the most hazardous dangers in this planet are the conclusion of perfectly voluntary conduct---specifically‚ smoking tobacco and taking part in unsafe sexual movement. We will take a gander at four classes of natural risks: Cultural‚ Biological‚ Physical and Chemical. Social Hazards
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of Experiment: Observation of Chemical Changes Purpose: To examine the reaction of common chemicals from household consumer products‚ and the changes they undergo. Procedure: After combining the chemicals listed below in Data Table 1‚ I observed the mixture against white and dark backgrounds by slipping white and black paper underneath the well plate. For every reaction‚ I wrote down the chemical combination‚ the well number‚ and my observations of the chemical reactions against the white and
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impurities might be compounds with properties similar to those of the desired compounds‚ reaction-starting materials‚ products of side reactions‚ or simple dust or soil. Pure substances are not only important to chemists in their studies of matter but also are vital in other areas of study such as medicine where those substances might be used as medications Crystallization is based on the principles of solubility: compounds (solutes) tend to be more soluble in hot liquids (solvents) than they are
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