CHAPTER 4 REVISION 1. How many moles of silver atoms are in 0.780 grams of silver? a) 0.78 moles b) 0.00723 moles c) 84.2 moles d) 0.522 moles 2. What is the molar mass of Mg(BrO4)2? a) 312 g mol-1 b) 232 g mol-1 c) 168.2 g mol-1 d) 477 g mol-1 3. What mass of the compound FeWO4 contains 50.0 grams of tungsten (atomic symbol W‚ atomic number = 74)? a) 30.0 g FeWO4 b) 304 g FeWO4 c) 82.6 g FeWO4 d) 188 g FeWO4 d) FeSO4 4. A compound contains 20.2%
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Relate chemical reactions with metabolism b.) Identify the major components of a chemical reaction c.) Describe at least one everyday example of an endergonic and exergonic reaction d.) Relate the breakdown and formations of organic molecules to catabolic or anabolic reactions Reference: * http://www.chem4kids.com/files/bio_metabolism.html * dela Cruz‚ Susana. Biology. Phoenix Publishing House‚ Inc.: Quezon City. 2003. Lesson Proper: Topic/ Content | Teacher’s Activity
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Taking the 3H integrated signal together with the 2H quadruplet signal‚ this combined integration and splitting pattern was indicative of a CH2-CH3 group being present on the unknown molecule. The three hydrogens on the end of the molecule have only 2 neighboring hydrogens; according to the n+1 rule‚ the 3H integrated hydrogens therefore appear as a triplet splitting pattern. The 2H integrated hydrogens have 5 neighboring hydrogens; according to the n+1 rule
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THE VSEPR THEORY The VSEPR stands for ¡°Valence Shell Electron Pair Repulsion¡±‚ the theory is used for predicting the structure of molecules. The theory can be used in two main steps. First‚ the number of all bonding pairs and lone pairs is calculated‚ next‚ these pairs of electrons are rearranged in order to minimize the repulsion between them. Different number of bonding pairs and lone pairs of electrons can form different structure. When there are only two bonding pairs around the central
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is written in superscript immediately after the chemical structure for the molecule/atom. The net charge is written with the magnitude before the sign; that is‚ a doubly charged cation is indicated as 2+ instead of +2. However‚ the magnitude of the charge is omitted for singly charged molecules/atoms; for example‚ the sodium cation is indicated as Na+ and not Na1+. An alternative (and acceptable) way of showing a molecule/atom with multiple charges is by drawing out the signs multiple times; this
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data would suggest if there are not enough degrees for those structures. Mass Spectrometry is a fast procedure that can give the structure of a molecule‚ but breaking everything apart is tedious‚ and it is used mainly to find the molecular weight of a molecule since the last and highest peak gives a signal in an equivalent of grams to mole of the molecule. Infra-red spectroscopy (IR) will present peaks in places characteristic of certain functional groups‚ and can show if a group is present‚ although
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conference. Close to two thousand of those in attendance are undergraduate‚ Easdon said and “many of them are presenting their senior research at a poster session‚ just like Chase did.” Sigler said the goal of his research was to “synthesize interesting molecules which could be anti-biotic precursors.” Singlar said much of his research revolved around structures known as beta-lactam rings. “It’s a four-member ring and has a nitrogen
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another element are represented by bolts. After examining each model‚ complete the following tasks: a. sketch a representative molecular picture of the model; b. describe the composition of the model in words (does the model contain atoms‚ molecules‚ or both?; does the model represent elements‚ compounds‚ or both?; does the model represent a pure substance or a mixture?) c. write the "chemical formula" of the model‚ using B as the symbol for a bolt and N for a nut. Lab report requirements:
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inter- or intra-molecularly because of the partially positive charge of H and the partially negative charge of O/N/F‚ Van der Waals between neutral atoms with partially charged regions due to asymmetric electron accumulation by chance. The atoms/molecules must be very close together * What are their similarities and differences? * What happens when a
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* Microbiology: Study of microorganisms Most microorganisms are pathogenicFalse The majority of bacteria are harmless True Total number of bacterial species: about 10 million to a billion What is a microorganism? An organism or virus too small to be seen without a microscope. (Smaller than 0.5 mm) Ex: Bacteria‚ Fungi‚ Protozoa‚ Algae‚ and Viruses Microbiom: collection of microbes Human cells vs. Microbial cells = 1:10 Which statement about Michaelangelo is not correct? A. He was
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