UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Ordinary Level CHEMISTRY Paper 1 Multiple Choice May/June 2005 1 hour Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) 5070/01 w w w e tr .X m eP e ap .c rs om READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and candidate number on the answer
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CM 1401 Practice Trial This paper consists of 5 MCQ and 5 free r esponse questions. Complete all the questions below. 1) For H Atom‚ select the on e that best represent the electron level diagram. a . S b. c. d. none of the above ( ) Choose 2) Which of the following is fa lse about MO theory? a) no. of atomic orbital formed will be the sam e as the
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NOT FOR ELECTRONIC STUDENT ACCESS ONLY FOR CLASSROOM USE!! Unit 9: Stoichiometry Practice 1. Differentiate between the significance of the coefficients in a balanced chemical equation and the significance of the subscripts in a chemical formula. · Coefficients show the correct proportions of atoms and molecules in a chemical reaction. They are normal sized numbers placed at the beginning of the chemical formulas in a chemical reaction during the process of balancing. They tell how many of an entire
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4.02 chemistry notes Law of Conservation of Mass One of the most important principles of chemistry is the law of conservation of mass. This law states that matter is neither created nor destroyed during an ordinary chemical reaction. In other words‚ all of the atoms that were present at the beginning of a reaction are present at the end of the reaction—they have just been rearranged to bond differently and form new substances. It is important that chemical equations represent this law by always
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INORGANIC CHEMISTRY – CLASS XI (ISC) Properties of Group 1 elements [Alkali metals] 1. Due to high reactivity‚ alkali metals do not occur free in nature. Elements of group 1 (or IA) are known as alkali metals because their hydroxides are soluble in water and form strongly alkaline solutions. Alkali metals are stored under kerosene oil because they get tarnished on exposure to air. 2. The general electron configuration of alkali metals is ns1. 3. Alkali metals have largest size and lowest
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Dana Erika Domingo III – St. Anne STERILIZATION OF WATER USING BLEACHING POWDER A CHEMISTRY INVESTIGATORY PROjECT ANSHUL KUMAR PANDEY XII B [THIS PROJECT LOOKS AT THE TECHNIQUE CALLED STERILIZATION OF WATER USING BLEACHING POWDER WHICH IS USED TO PURIFY WATER AND MAKES IT FIT FOR DRINKING.] INDEX I. Introduction -Need of Water -Purification of Water -Need for a stable purification technique II. Theory -History of Water purification -Bleaching powder
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occurs and see if a precipitate or gas forms between any of these reactions. Research 1. Table A Reactants in Aqueous Solutions Predictions (1) MgCl₂(aq) + 2NaOH(aq) Mg(OH)₂(s) + 2NaCl(aq) (2) FeCl₃(aq) + 3NaOH(aq) Fe(OH)₃(s) + 3NaCl(aq) (3) 2KCl(aq) + Na₂SO₄(aq) K₂SO₄(s) + 2NaCl(aq) (4) CaCl₂(aq) + 2AgNO₃(aq) Ca(NO₃)₂(s) + Ag₂Cl(aq) (5) CuSO₄(aq) + Na₃PO₄(aq) Cu₃PO₄(aq) + Na₂SO₄(s) 2. Table B Reactants Predictions (1) Na₂CO₃(s) + 2HCl(aq) NaCl(aq) + CO₂(g) + H₂O(l) (2) NH₄Cl(s) + NaOH(aq)
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2 1 3 4 2 5 6 3 7 8 4 9 10 5 11 12 6 13 1 7 Shelley saw a wounded dog He brought it home He loved .the dog 26 The dog too __________________ 27 ________________ to trace the owner 28 One day ‚ a lady ------------------------------ 29 The dog’s real name ______________ 30 2 The dog had to be given back‚ as 3 8 4 5 9 Savings10% Food 30% Rent 30% Entertainment 5% Education 20%
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← Muon ← Is created when a neutrino collides and combines with an H2O proton (weak force) ← Creates blue light ← High energy; travels faster than the speed of light (in water) ← Neutrino ← Type of particle: Lepton (like electrons and muons) ← Most abundant particle in the universe ▪ 1016 neutrinos are passing through your body at any point in time ← Theoretically discovered by Wolfgang Pauli (1930); actually discovered in 1955 ← Produced during nuclear reaction or changes
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Theoretical value-Experimental valueTheoretical value × 100 The compound that they are going to use in this experiment is KCl or potassium chlorate. Potassium chlorate‚ when heated to high temperatures would form this equation: 2KClO₃ (s) ∆ 2KCl (s)+3O₂ (g) Procedure The experiment was composed of two parts. The first part was for determining the percentage composition of potassium chlorate. First‚ the researchers made sure that the crucible‚ which would be used throughout the experiment
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