1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 2015SP-BIOL-1408-43440 Biology for Non-Science Majors I_Pebble Barbero EXAM ONE Cheating Question – I acknowledge I won’t cheat. You expose the bacteria Staphylococcus aureus to low levels of antibiotic methicillin. The surviving bacteria are then exposed to higher concentrations of methicillin and the process repeated until a strain of methicillin-resistant S. aureus (MRSA) was generated. To test your hypothesis‚ you perform an experiment
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the concept conveyed in the diagram. Task 1 – Chemical Bonding and the Periodic Table In this task you have to describe atomic structure‚ outline the key features of the periodic table and describe chemical bonding Draw a diagram of a Calcium atom‚ label the key components of
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------------------------------------------------- Lewis structure From Wikipedia‚ the free encyclopedia The Lewis structure of acarbon atom‚ showing its fourvalence electrons The Lewis structure of water Lewis structures (also known as Lewis dot diagrams‚ electron dot diagrams‚ and electron dot structures) are diagrams that show the bondingbetween atoms of a molecule and the lone pairs of electrons that may exist in the molecule.[1][2][3] A Lewis structure can be drawn for any covalently bondedmolecule
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Quaregna and Cerreto (9 August 1776‚ Turin‚ Piedmont – 9 July 1856) was an Italian savant. He is most noted for his contributions to molecular theory‚ including what is known as Avogadro’s law. In tribute to him‚ the number of elementary entities (atoms‚ molecules‚ ions or other particles) in 1 mole of a substance‚ 6.02214179(30)×1023‚ is known as the Avogadro constant. Avogadro’s Life Amedeo Avagadro was born in 1776 in Turin‚ a city in northwestern Italy. Avogadro spent his entire life within
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metallic‚ hydrogen bonding‚ van der Waals (including London dispersion forces) c. Polarity of bonds‚ electronegativities 2. Molecular models a. Lewis structures TYPES OF CHEMICAL BONDING Ionic Bonding - two atoms of opposite charge electrically attracted to one another Covalent Bonding - two atoms each sharing electrons within a molecular orbital Metallic Bonding - positive metal ions held together in a lattice with a “sea of electrons” An actual chemical bond is a blend of all three types of bonding
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Electrons Example~ A hydrogen atom has one electron. If it had two electrons‚ it would have the same electron configuration as a helium atom. Two hydrogen atoms can achieve a stable electron configuration by sharing their electrons and forming a Covalent bond. A covalent bond is a chemical bond in which two atoms share a pair of valence electrons. When two atoms shair one pair of electrons‚ the bond is called a singe bond. Molecules of Elements Two hydrogen atoms bonded together form a unit
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total number of atoms for each substance. Substance Number and type of atoms a Mg(OH)2 d 2 NaOH e Al2(SO4)3 f Mn3(PO4)2 g 5 Pb(OH)2 h KMnO4 i NH4NO3 j NaClO3 k Zn(C2H3O2)2 l Total atoms Na2SO4 c / 24 H2O b 2 marks for each correct row 6 C6H12O6 2 Describe what the following chemical symbols and formulae represent. Symbol or formulae a OH1- b Polyatomic ion (hydroxide). One atom of oxygen bonded
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Paragraph 1 Perovskite‚ with a general formula of ABO3‚ has a structure comparable to that of ReO3. What differentiates them is the fact that ReO3 lacks the cation A at its unit cell centres. An octahedron made up of six oxygen atoms encompasses each rhenium atom‚ and it forms the 3-dimensional structure by connecting its corners with other octahedral. At low temperatures and a pressure of about 3kbar‚ the Fermi-surface cross sections undergo nonlinear patterns. ReO3 thus undergoes phase transitions
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Chemistry Atomic Structure: The Electron A myriad of trends occur on the periodic table‚ whether it is defined through the size of the atoms or the first ionization energy that may occur‚ many other trends can be found simply looking horizontally or vertically on to the table. As you look from left to right you can see that the reactivity of the elements increase‚ this is due to the number of electrons increasing on the shell. This also once you go down the table; the shells become further and
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BIOLOGY TEST NOTES Biology is the study of life Living organisms share a set of characteristics that collectively set them apart from non-living matter Living organisms use molecules that contain instructions for building other molecules Living organisms gather energy and materias from their surrounding to: Build new biological molecules Grow in size Repair their parts Produce offspring All organisms are composed of the same macromolecules (proteins‚ fatty acids/lipids‚ carbs and nucleic
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