Give 3 examples for diatomic molecules and draw their Lewis dot structures. In your structures, show the lone pair of electrons (unshared) and shared pair of electrons. A molecule is a neutral group of atoms joined together by covalent bonds. 3) Cobalt, a
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or electrons that are capable of forming chemical bonds. An atom, to be stable, must have four pairs of valence electrons or a total of eight electrons at its outermost energy level. There are two ways by which atoms can complete this configuration in the outermost energy level: 1. An atom may share electrons with other atoms so that with the shared electrons it acquires a complete outermost shell. The chemical bond formed is called a covalent bond. 2. An atom may lose or gain enough
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will learn about: a) What is the Functional groups and types. b) Macromolecules a) The build up of covalent bond by condensation or dehydration. b) The brake up of covalent bond by hydrolysis c) The chemical elements of life: a review Functional groups contribute to the molecular diversity of life • The components of organic molecules that are most commonly involved in chemical reactions are known as functional groups. • Functional groups are attachments that replace one or more hydrogen
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Biology: Concepts and Connections, 6e (Campbell) Chapter 1 Introduction: The Scientific Study of Life 1) Which of the following statements about the leopard is false? A) Leopards are the largest cat in the genus Panthera. B) Leopards, like lions, can roar. C) Leopards prefer to eat their kill in trees. D) Leopards are well-adapted for nocturnal hunting. E) Leopards are normally solitary animals. Answer: A Topic: Opening
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Objective/ Theory: A cycloaddition is a pericyclic chemical reaction, in which two pi bonds are lost and two sigma bonds are gained. Cycloaddition of (4n+2) type is concerted and with our intermediates thermally allowed, by means that the reaction proceeds in one step when the constituents are heated properly. One the contrary, the (2+2) cycloaddition between two alkenes does not occur via concerted mechanism because it is thermally forbidden due to Woodward and Hoffman’s rule. Diels-alder reactions
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sample to sample (Tillery, p. 200). The book provides an example of sand from a beach. It has a variable mixture of such things as bits of rocks, minerals and sea shells (Tillery, p. 200). A compound is a pure substance that can be decomposed by a chemical change into simpler substances with a fixed mass ratio (Tillery, p. 201). So the difference is that a compound is made up of two or more elements that have a composition that is constant. And a Mixture is an aggregate of two or more substances
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Study Guide:Quiz 1 Concentrate your studies in the following areas. Questions for Quiz 1 will come principally from this material. Lutgens and Tarbuck Textbook: Introduction * What is the definition of Earth Science? Is the name for all the sciences that collectively seek to understand Earth and its surrounding space. It includes geology oceanography, meterogology, and astronomy * What are the sub-disciplines of earth science (geology, meteorology, oceanography, and astronomy)? Know
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Benzene Benzene is a material used at the start and is used as a building for many other aromatic materials. These chemicals include ethyl benzene, phenol and styrene. Smaller amounts of benzene can be used to make a wide range of materials. However benzene is a known carcinogen (chemical that causes cancer) .so continual exposure of this carcinogen benzene vapour can result in leukaemia. Benzene has a rather dull appearance as it appears as a colourless liquid although it does have a sweet odour
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Introduction A Diels-Alder reaction is a reaction in which a conjugated diene bonds with an alkane to produce a cyclohexane molecule. This reaction works best with dienes that are electron rich and dienophiles that are electron poor. For this experiment, our dicyclopentadiene is the diene and the maleic acid is our dienophile. In a Diels-Alder reaction, sigma bonds are formed from pi bonds. For this particular experiment, cyclopentadiene and maleic anhydride react via Diels-Alder in order to
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called an ION. A positive ion is called a CATION and a negative ion is called an ANION. T. Trimpe & L. Bogner 2008 http://sciencespot.net/ Section B: Ionic Bonds ANSWER KEY What is an ionic bond? Atoms will transfer one or more electrons to another to form the bond. Each atom is left with a complete outer shell. An ionic bond forms between a metal ion with a positive charge and a nonmetal ion with a negative charge. Example B1: Sodium + Chlorine Example B2: Magnesium + Iodine I Na
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