SPECIMEN H GENERAL CERTIFICATE OF SECONDARY EDUCATION B721/02 GATEWAY SCIENCE ADDITIONAL SCIENCE B Unit B721: Additional Science modules B3‚ C3‚ P3 (Higher Tier) Candidates answer on the question paper A calculator may be used for this paper. OCR Supplied Materials: None Duration: 1 hour 15 minutes Other Materials Required: Pencil Ruler (cm/mm) Candidate Forename Candidate Surname Centre Number Candidate Number INSTRUCTIONS TO CANDIDATES
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There are many ways to examine the subject of alchemy‚ including alchemy as a source of symbolism‚ psychology‚ and mysticism. It has also been an influence on the world view of various writers‚ artist‚ and musicians. The focus of this report is alchemy as a pre-chemistry‚ which gave a new impulse towards the preparation of medicinal remedies and also was a major influence on today’s scientific investigations.<br><br>Alchemy is an ancient art‚ practiced in the Middle Ages. The fundamental concept
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250ml 0.05M = 1.325g = 0.1N | Adipic acid HO2C(CH2)4CO2H‚ FW = 146.4‚ Eq. = 73.03g/l 250ml 0.05M = 1.83g = 0.1N | Barium hydroxide Ba(OH)2.8H2O‚ FW = 315.48‚ Eq. = 157.5g/l 250ml 0.05M = 3.94g = 0.1N | Benzoic acid C6H5COOH‚ FW = 122.12‚ Eq. = 61g/l 250ml 0.05M = 1.52g = 0.1N | Calcium carbonate CaCO3‚ FW = 100.00‚ Eq. = 50g/l 250ml 0.05M = 1.25g = 0.1N | Furroic acid FW = 112.08‚ Eq. = 112g/l 250ml 0.1M = 2.8g = 0.1N | Hydrochloric acid HCl‚ FW = 36.5‚ Density = 1.2 1M = 83mls
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with state symbols for the following reactions. (i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride. (ii) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water. Answer (i) (ii) Page 1 of 13 Class X Question 1: Chapter 1 – Chemical Reactions and Equations Science A solution of a substance ‘X’ is used for white washing.
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iLab‚ Week # 3 ATOMIC WEIGHT OF MAGNESIUM LAB Introduction The purpose of this lab experiment is to determine the atomic weight of magnesium by measuring the amount of hydrogen gas evolved when hydrochloric acid reacts with magnesium. The reaction is as followed: Mg + 2HCL H2 + Mg2+(aq) + 2Cl-(aq) In this experiment there is a one to one relationship between the number of moles of hydrogen gas evolved and the moles of magnesium metal consumed in the reaction. Therefore in the finding of
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Sp N ec e ifi w ca tio n Centre Number 71 Candidate Number General Certificate of Secondary Education 2013–2014 Science: Single Award Foundation Tier GSS21 Unit 2 (Chemistry) [GSS21] THURSDAY 15 MAY 2014‚ MORNING TIME 1 hour. INSTRUCTIONS TO CANDIDATES Write your Centre Number and Candidate Number in the spaces provided at the top of this page. Write your answers in the spaces provided in this question paper. Answer all eleven questions. For Examiner’s use only Question Marks Number 1
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Jillian Mulrooney & Emma Zika Test Questions Concept 1: Write the name of the acids and bases from given formula Q-1-1: Name the following base: NaOH Q-1-2: Name the following acid: HCN Concept 2: Write the formula form given name of acids and bases Q-2-1: Write the formula for the following acid: lithium hydroxide Q-2-2: Write the name for the following base: hydrobromic acid Concept 3: Distinguish between acid‚ base‚ neutral compounds based on their properties which can be tested in a lab
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History of Calcium- Calcium is a very interesting element that has a lot to tell about itself. There is much history to be learned about calcium. Calcium was actually discovered by Humphry Davy in 1808. Calcium’s name happens to come from the latin ‘calx’ meaning lime. Lime (calcium oxide‚ CaO) was a useful material that was created by heating limestone. Before the discovery of calcium‚ a man named Antoine Lavoisier classified the lime as “earth” because it was very difficult‚ almost
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primary‚ secondary or tertiary depending on the number of alkyl substituents directly attached to the carbon attached to the halogen atom. The purpose of this lab was to properly prepare t-butyl chloride from t-butyl-alcohol in a concentrated hydrochloric acid. The reaction occurs through a nucleophilic substitution‚ which is when a nucleophile replaces the leaving group in the substrate. In this lab‚ the hydroxyl group of t-butyl alcohol is replaced by a chlorine atom. The reaction proceeds through
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CBSE Continuous and Comprehensive Evaluation (CCE) Sample Question Papers Solutions Term 1 (April to September 2013) Science Class OSWAAL BOOKS CONTENTS l Solutions q Sample Question Paper 6 q Sample Question Paper 7 q Sample Question Paper 8 q Sample Question Paper 9 q Sample Question Paper 10 1 - 7 8 - 13 14 - 20 21 - 26 27 - 32 ll SAMPLE QUESTION PAPER–6 Section-A 1. Moving charges / electric current / magnet (any two). 2. (i) To develop male secondary sex organs
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