The statue portrays a boxer seated with his arms resting on his knees‚ his head turned to the right and slightly raised with mouth open (fig. 4). The figure is naked except for his boxing gloves‚ which are of an ancient Greek type with strips of leather attached to a ring around the knuckles and fitted with woolen padding (fig. 5)‚ and the infibulations of his penis by tying up the foreskin‚ which was both for protection and an element of decorum. The boxer is represented just after a match. His
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following questions. ___e___ 1. A hypothesis is a(n) a. formulation of principles based on facts. b. modification of a theory. c. organized body of knowledge. d. tentative explanation of observations. e. None of the above. __b___ 2. The initial success of the Bohr theory was based on a. its ability to predict the atomic spectra of multi-electron atoms. b. its ability to predict the atomic spectrum of hydrogen atoms. c. its prediction of the precise radius of electron
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concentration of a range of include: The frequency of rainfall (floods and droughts)‚ water temperature and evaporation rates. Land clearing and pollution‚ such as fertiliser usage and industrial waste are factors caused by human activity. Looking at figure 2 and 3‚ some well-known examples include increased dissolved salt concentration in the Dead Sea due to high evaporation and damaged aquatic life near the Great Barrier Reef caused by run-off from agricultural land. Eutrophication is caused by an excess
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During the electrolysis of molten lead bromide‚ which of the following takes place : A : Bromine is released at the cathode. B: Lead is deposited at the anode. C : Bromine ions gain electrons. D: Lead is deposited at the cathode. Ans : - D. Q. 2. Here is an electrode reaction : Cu → Cu2+ + 2e-. [i.e. Cu- 2e- →Cu2+]. At which electrode(anode or cathode) would such a reaction take place. Is this an example of oxidation or reduction. Ans : - At anode. Oxidation. Q. 3. A solution contains magnesium
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when it cooks is also a chemical reaction (if this does not happen the bread will have not have shape) Baking powder: Baking powder has two chemical reactions which are the following: 1. When it is mixed with wet ingredients it reacts to add co2 2. But that is not all when it hits the oven it reacts to the heat as well. Double Replacement: Baking soda (NaHCO3) reacts with acidic substances (HA) in cake batter in a double replacement reaction: Reactant Product NaHCO3 + HA
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CELL STRUCTURE CELL THEORY: Structural and functional unit of all living things New cells arise from already existing cells Cells contain information that instructs growth. This information can be passed onto new cells. MICROSCOPES: There are two main types of microscopes: Light and Electron Electron Micrographs- shown in colour LIGHT ELECTRON Uses beam of light Magnification = x1500 Resolution = 200 nm Wide range of specimens can be used Samples are fairly quick + easy to prepare
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Combustion of Acetylene (ethyne) Rx: Back Why I don’t do acetlyene explosions in our lab.... Combustion of alkanes A quick review.... • Combustion reactions of alkanes consist only of C and H (hydrocarbon) • require O2(g) as a reactant • produce CO2(g) and H2O(g) and a large amount of energy!! Oxygen can be the limiting reagent which can lead to Incomplete combustion. For complete combustion of a hydrocarbon‚ oxygen must be in excess. If there isn’t sufficient oxygen‚ incomplete combustion occurs
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EST1: Task 310.2.1-05 Opportunities for Company Q to lead in the area of social responsibility Company Q’s attitude towards social responsibility appears to be nonexistent‚ possibly through ignorance or disconcert. Either way the lack of social responsibility affects their business and community’s perception of their business. It appears that the company management has never developed and ethics program that clearly defines the corporate culture including provisions for social responsibility. Profits
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Neutral Basic NaCl KNO3 NaOH HC2H3O2 Na2CO3 NaC2H3O2 NaHCO3 Fe(NO3)3 NaNO3 Na3PO4 HCl MgSO4 KOH HNO3 Na2SO4 NaHPO4 CuSO4 NaNO2 CoCl2 Al(NO3)3 NiCl2 H2SO4 KCl NH4Cl 12. CuSO4 CuCO3.Cu(OH)2(s) + 2 H2SO4(aq) ----> 2 CuSO4(aq) + CO2(g) + 3 H2O(l) Na3PO4 Na3PO4 (aq) + 3H2O (l) --> H3PO4 (aq) + 3NaOH (aq) 13. Arrhenius definition says that a base yields the hydroxide ion (OH-) in an aqueous solution. Arrhenius definition is dependent on substances
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groups of atoms together and make them function as a unit. A bond will form if the energy of the aggregate is ______than that of the separated atoms. ____________ – energy required to break a chemical bond Bonding involves ________________. 2 Chemical Bonds‚ cont. In general‚ there are three types of chemical bonds: I. Ionic bond: Transfer of electrons from one atom to another. Seen primarily in M + NM. Bond is an electrostatic attraction of of a _______for an ______. II. Covalent
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