Centre Number Surname Other Names Candidate Signature Candidate Number For Examiner’s Use Examiner’s Initials Question Mark General Certificate of Secondary Education Higher Tier June 2014 1 2 3 Additional Science Unit Biology B2 BL2HP 4 5 Biology Unit Biology B2 Tuesday 13 May 2014 9.00 am to 10.00 am H 6 7 TOTAL For this paper you must have: a ruler. You may use a calculator. A Time allowed 1 hour Instructions Use black ink or black ball-point pen. Fill in the boxes at the
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- Medicinal Chemistry - Question No. 3. Define the Hammett Constant and the hydrophobic (Hansch) substituent constant. Comment on how inductive and mesomeric polar effects are treated in substituted aromatic systems. A quantitative structure-activity relationship (QSAR) is an equation which correlates measurable or calculable physical or molecular properties to some specific biological activity. Once this relationship has been determined, it is possible to predict the biological activity of related
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2. EXPERIMENTAL DETAILS 2.1 MATERIAL SELECTION Aluminium 2618 was used as the base material in this study. Two types of salt, namely K2ZrF6 & KBF4 were used to synthesize the ZrB2 reinforcement in addition to Si3N4 (Silicon Nitride), AlN (Aluminium Nitride).The chemical composition of the base material is shown in Table.1. Table.1. Chemical composition of Al2618 alloy in wt% Element Cu Mg Fe Ni Si Ti Al Wt% 2.30 1.60 1.1 1.0 0.18 0.07 Bal Aluminum 2618 is melted in a graphite crucible and a stirrer
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Background and History Spironolactone is a light cream colored stable powder that has a faint odor.1 It is available in 25 mg tablets that are round, film coated, and a light yellow color.2 Spironolactone was created by G.D. Searle and is currently the only product that directly treats hyperaldosteronism, the excess production of aldosterone in the body.3 Spironolactone goes by several trade names including Aldactone and Spironolone, which are also common. Spironolactone is in the aldosterone-receptor
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place of onions in cooking? (i) Fessia (ii) Tulip (iii) Dahila (iv) Gladiolus (c) What is the state flower of New York? (i) Poppy (ii) Orange blossom (iii) Camellia (iv) Rose (d) Sour milk contains. (i) Lactic Acid (ii) Ascorbic Acid (iii) Citric Acid (iv) Phosphoric Acid (e) _________ exists in pure state. (i) Elements (ii) Compounds (iii) Mixtures (iv) All of these Q6 Complete the following word pairs. (5) (i) Work Growth (ii) Performance Place (iii) Industrial
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How to Handle Lactose Intolerance - 18 Home Remedies 1. Apple cider vinegar People who find themselves intolerant to lactose may start using apple cider vinegar. It improves the digestion incredibly and neutralizes the acids present in the stomach. Take a tablespoon of it along with a glass filled with water once every day for several weeks. Apple cider vinegar is specifically helpful during the initial stages. 2. Kefir Kefir is a probiotic that may have a beneficial action on the digestive system
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Without using electricity, there are many ways to illuminate a parking lot. First, I can decorate the ceilings and walls of the parking lot with glow sticks (light sticks). This method of producing light is called chemiluminescence. Chemiluminescence is the direct production of light as the result of a chemical reaction with little or no heat produced. The glow sticks can operate by causing two chemicals to mix. A common reaction used for these devices are hydrogen peroxide and phenol oxalate ester
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III) Methods and Materials To test my hypothesis, I used four individual glow sticks, which was my independent variable. Two of the glow sticks were green, whereas the remaining two were red. However, in order to test the effect of bright colors against dull colors, I wrapped one green and one red glow stick in wax paper in order to make their colors dull, and left the other two unwrapped to give off a brighter color. I conducted one trial per glow stick, ending with four trials in total. I also
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two titrations. In table two and three, the known molarity of NaOH, a base, was used to find the molarity of acetic acid and sulfuric acid. The phenolphthalein indicator was used in all three titrations to make it possible to visually see when the solution reached the endpoint point. In the lab, it is impossible to record the equivalence point, when the moles of base equals moles of acid, so the endpoint is recorded. The endpoint is the point when the solutions turns from clear to light pink. The endpoint
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Table 1 displays how each solution was determined their acidity, alkalinity or neutrality based on the color of blue and red litmus paper. When red and blue litmus paper was dipped into sodium chloride, both papers remained the same color indicating that the solution is neutral. The ammonium chloride is revealed as acidic due to the blue litmus paper changing to a red color. The red litmus paper turned blue when it was dipped into sodium acetate demonstrating that it is a basic solution. Finally
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