Research Essay- Jacobus Henricus Van’t Hoff Jacobus Henricus Van’t Hoff was born in Rotterdam‚ the Netherlands‚ on August 30‚ 1852. He was the third child in a family of seven children. His father was Jacobus Henricus Van’t Hoff Sr.‚ a physician‚ and his mother was Alida Kolff Van’t Hoff. From a young age he was interested in science‚ nature and philosophy and though of Lord Byron as his idol. Van’t Hoff went against the wishes of his father when he enrolled at Delft University of Technology
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main components. ▪ Carbon- carbon multiple bonds ▪ Single bonds between a carbon atom and a more electronegative atom. ▪ Carbon atom double bonded to an oxygen atom Hydrocarbons • Hydrocarbons are organic compounds that contain only carbon and hydrogen atoms. • There are 3 types of aliphatic hydrocarbons: o Alkanes ▪ A hydrocarbon with only single bonds between carbon atoms. ▪ General formula is Cn H2n+2 ▪ All alkanes have the ending –“ane” ▪ Any
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The Nature of biology and science Cell theory: * All organisms are made of cells and the products of cells * All cells come from pre-existing cells * The cell is the smallest organisational unit Cells have an outer membrane‚ encloses fluid contents of cell (cytoplasm) Robert Hooke (1665): observed dead cells from bark Anton van Leeuwenhoek: described living cells Matthias Schleiden: plant issues Theodor Schwann: animal tissues Bacteria found without nucleus and lacking other membrane-bound
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Exam: Chapter 1 Study Guide 1. What are the 11 levels of organization? Briefly define each. Atom - fundamental units of matter‚ building block of all substances Molecule - atoms joined in chemical bonds (an association of 2 or more atoms) Cell - smallest unit of life Tissue - organized array of cells and substances that interact in a collective task Organ - structural unit of interacting tissues Organ System - a set of interacting organs Multicelled Organism - individual that consists
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S. E‚ Criminal law in Zambia; text‚ cases and materials: UNZA press. Lusaka. 2006 Sir Smith J and Hogan B‚ Criminal law; Cases and materials‚ sixth edition: Dublin & Edinburgh. Butterworth. 1996 CASES Chitenge v the people (1996) ZR 37 Mbomena Moola v the people (2000) ZR 148 SC STATUTES The Penal Code Act‚ Chapter 87 of the laws of Zambia.
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Properties * Chemical Property- the ability of a substance to change and form new substances. * Chemical Reactivity- With water‚ oxygen‚ acids‚ or another pure substance. * Combustibility- the ability of a substance to burn in air * Stability- the ability of a substance to remain unchanged. * Toxicity- the ability of a substance to cause harmful effects in plants and animals. Signs 1. Heat is produced. 2. Colour changes. 3. Bubbles form. 4. Precipitate forms(white specs
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the periodic table was occupied by multiple entities. Hence Todd made the suggestion‚ which Soddy adopted‚ that a suitable name for such an entity would be the Greek term for "at the same place". Soddy’s own studies were of radioactive (unstable) atoms. The first observation of different stable isotopes for an element was by J. J. Thomson in 1913. As part of his exploration into the composition of canal rays‚ Thomson channeled streams of neon ions through a magnetic and an electric field and measured
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terms below‚ you are prepared for an exam. You need to spend time with your lecture notes‚ and prepare your own review questions in addition to the ones provided here. WHITE 301 General Themes and Topics Atoms‚ Elements and Molecules (Chapter 2) Describe the general structure of an atom and define atomic number‚ atomic mass‚ valence electrons‚ and isotopes. Atomic number – the # of protons in the nucleus Atomic mass – the number of protons and neutrons Valence electrons – the number of electrons
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nature. A. oxygen atoms are electron seeking (electronegative)‚ especially compared to hydrogen; thus for an oxygen-hydrogen bond: B. The polar character of water allows water molecules to form many (up to 4) hydrogen bonds. II. What properties of water are important for life? A. Cohesion of water molecules 1. Cohesion: e.g.: 2. Adhesion: e.g.: 3. Surface tension: B. Ability to moderate temperature 1. The unusual specific heat of water leads to temperature stability specific heat –
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calculations carried out in gas phase at temperature 293.15 k and pressure 1 atm. The simulation results revealed that the trans configuration of azocubane exhibits more stability‚ low reactivity and more detonation property as compared to the cis trans configuration of azocubane. Keywords: Azocubane‚ Cis and trans configurations‚ DFT study‚ Stability‚ Reactivity. Introduction Cubane‚ first appeared on the scientific research stage after painstaking experimentation and was conclusively synthesized by Eaton
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