but has two less hydrogen atoms. Theobromine is the substance in chocolate that can be toxic to animals. It also has a bitter taste‚ and is found in higher quantities in dark chocolate than milk chocolate. Theobromine increases excretion of water from bodies‚ relaxes‚ and stimulates. There is no evidence of the relationship between the structure and functions. Theobromine is an alkaloid belonging to the methylxanthine group. It is made up of seven carbon atoms‚ eight hydrogen atoms‚ four nitrogen
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special case of conjugation that leads to an especially stable bonding arrangement. The benzene ring consists of six sp2 hybridized carbon atoms in a regular hexagon. Each carbon forms two σ-bonds with adjacent carbons‚ and a third σ-bond with a hydrogen atom. The 2p orbital on each atom is available for π-bonding. Interaction between the p orbitals on the six carbon atoms forms a conjugated system of π-electrons. Molecules with this bonding arrangement are called aromatic molecules. For convenience
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product‚ 2-bromohexane‚ is analyzed to see if it is produced according to Markovnikov’s rule‚ which states that when an alkene reacts with a hydrogen halide (HBr) to form an alkyl halide‚ the H+ is added to the carbon with a greater number of hydrogen substituents to form a more stable carbocation and the halogen (Br-) is added to the carbon with fewer hydrogen substituents. A heterogeneous mixture of 0.5mL of 1-hexane‚ 2 mL of 48% aqueous hydrobromic acid‚ and 150 mg of tetrabutylammonium bromide
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anywhere in the book if you wanted to. The first element I will discuss is hydrogen. Hydrogen is the first element on the periodic table and is the most reactive. It only has one proton and one electron. It is the most abundant element in the universe. It is cheap to buy and it was used in some ships a long time ago. It didn’t go so well. Another fact about hydrogen is that our sun converts 600‚000‚000 tons of hydrogen into 596‚000‚000 million tons of helium. The rest of it is converted into energy
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Gerona‚ Evelyn Chemical Reactions Experiment No. 7 Date Performed: Feb. 17‚ 2014 Date Submitted: Feb. 24‚ 2014 Mrs. Vitancol I. Theoretical Framework A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Classically‚ chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms‚ with no change to the nuclei (no change to the elements present)‚ and can often
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experiment I will investigate the relationship between the concentration of the hydrochloric acid and the rate of a reaction. To find this out I will react different concentration of hydrochloric acid and magnesium‚ from there I will monitor the gas (hydrogen) produced and analyse the results. Prediction: I predict the higher the molarity of the hydrochloric acid the faster the rate of reaction therefore the quicker the gas will be produced in the specific time interval. Overview of the experiment:
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1 (a) In this apparatus hydrochloric acid is decomposed by passing a direct electric current through it. Chlorine and hydrogen are formed. (i) Give the name of this process in which substances‚ such as hydrochloric acid‚ are decomposed by a direct electric current. (1) electrolysis (ii) Describe what happens when a burning splint is applied to a mixture of hydrogen and air in a test tube. (2) (b) (i) Complete the sentence by putting a cross ( ) in the box next to your answer. An acid
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Human Physiology ZOOL 2404 Instructor: Dr. Gollahon Copyright © 2009 Pearson Education‚ Inc.‚ publishing as Pearson Benjamin Cummings Introduction Chapters 1 and 2 Study strategies crucial for success Attend all lectures‚ labs‚ and study sessions Read your lecture notes and text materials before listening to the audio or watching the video lectures Devote a block of time each day to your Physiology course Set up a study schedule and stick to it Do not procrastinate!
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V. Kumar Dean Sri Chaitanya Educational Institutions Hyderabad Chemistry - Ist year Chapter-wise Weightage of Marks Name of the Chapter Atomic Structure Periodic classification of elements Chemical bonding States of matter Stoichiometry Hydrogen and its compounds IA and IIA groups IIIA group IVA group Noble gases Environmental chemistry Organic chemistry Marks Weightage 8 8 8 6 6 6 6 4 4 4 4 12 Type of Questions 1 LAQ (or) 2 SAQ (or) 1 SAQ & 2VSAQ 1 LAQ (or) 1 SAQ & 2 VSAQ 1 LAQ (or) 1 SAQ &
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of the same element that differ in their mass number because they have different numbers of neutrons in their nuclei (atomic # will still be the same) Ex. U-235 235 - 92 = 143NO Mass: 235 Protons – Mass = Neutrons 92P+ Isotopes of Hydrogen Hydrogen –1 proton‚ no neutrons Deuterium (heavy water) – 1 proton‚ 1 neutron Tritium
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