The Big Bang theory states that all the matter that is in the universe was once in a very small amount of space with infinite temperature‚ pressure‚ and density. This theory is well supported and there are many reason for it’s support. One main reason is that no one really has a clue and The Big Bang Theory seems far fetched but more reasonable than any other ideas that there are out there. Some of the important thing to know about the big bang to understand are the beginning and the few seconds
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Structural Analysis of Serine Peptidase-Inhibitor Complexes When analyzing these structures‚ we observed a reasonably strong hydrogen bond interaction (distance ~ NVL ≫ AAoF ≈ NVoL. Surprisingly‚ the unmodified AAF compound showed a substantially higher level of activity over the unmodified NVL compound. Initially‚ we hypothesized that the modified compounds (No H-Bond) would be less active. To our surprise‚ both modified compounds‚ AAoF and NVoL‚ showed negligible activity (Figure 16). Additionally
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3. Write the chemical equations for the following reactions. a. When heated‚ solid calcium reacts with solid sulfur to produce solid calcium sulfide. Δ Ca (s) + S (s) → CaS (s) b. Hydrogen gas reacts with fluorine gas to produce hydrogen fluoride gas. H2 (g) + F2 (g) → 2 HF(g) c. Solid aluminum metal reacts with aqueous zinc chloride to produce solid zinc metal and aluminum chloride. (Check the Solubility Rules to determine
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Methylene blue can act as an artificial hydrogen acceptor; when this dye is reduced by accepting hydrogen atoms it goes colourless. As such‚ it can be used to guage the rate of respiration by measuring the time taken for it to turn colourless. Methylene blue‚ acting as a hydrogen acceptor‚ is decolourized during the respiration of yeast. By measuring the time taken for a fixed amount of the dye to be decolourized‚ the relative rate of respiration (a catabolic process) can be deduced. Results:
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ELECTROLYSIS Electrolysis decomposition of compound using electricity Electrolyte an ionic compound which conducts electric current in molten or aqueous solution‚ being decomposed in the process. Electrode a rod or plate where electricity enters or leaves electrolyte during electrolysis. Reactions occur at electrodes. Discharge the removal of electrons from negative ions to form atoms or the gain of electrons of positive ions to become atoms. Anode
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4.02 chemistry notes Law of Conservation of Mass One of the most important principles of chemistry is the law of conservation of mass. This law states that matter is neither created nor destroyed during an ordinary chemical reaction. In other words‚ all of the atoms that were present at the beginning of a reaction are present at the end of the reaction—they have just been rearranged to bond differently and form new substances. It is important that chemical equations represent this law by always
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CO2 and H2O as main products. 2) A hydrocarbon is a molecule that contains only carbon and hydrogen 3) Combustion analysis of naphthalene‚ a hydrocarbon used in mothballs‚ produced 8.80g CO2 and 1.44 H2O. Calculate the empirical formula for naphthalene. 8.80g CO2 (find moles of Carbon by dividing the molar mass and doing the molar ratio of C and CO2 = 0.200mol C. 1.44H2O (find moles of Hydrogen by dividing the molar mass of water and doing the ratio of 2moil H/1molH2O) 0.160mol H divide
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Stars expand as they grow old. As the core runs out of hydrogen and then helium‚ the core contacts and the outer layers expand‚ cool‚ and become less bright. This is a red giant or a red super giant (depending on the initial mass of the star). It will eventually collapse and explode. Its fate is determined by the original mass of the star; it will become either a black dwarf‚ neutron star‚ or black hole. NEBULA -A nebula is a cloud of gas (hydrogen) and dust in space. Nebulae are the birthplaces of
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® Copying is permitted according to the Site Licence Conditions only keep it simple science Preliminary Chemistry Topic 2 METALS What is this topic about? To keep it as simple as possible‚ (K.I.S.S.) this topic involves the study of: 1. OUR USE of METALS 2. CHEMICAL ACTIVITY of the METALS 3. PATTERNS of the PERIODIC TABLE 4. QUANTITY CALCULATIONS... the MOLE 5. METALS from their ORES ...all in the context of how Chemistry contributes to cultural development but first‚ an introduction
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Method – PG 5‚ 6‚ 7 Preliminary – PG 7 Actual experiment and graphs – PG 7+ Chemistry coursework Hypothesis/Aims The aim of the investigation is to see how different concentrations of hydrochloric acid affects the rate at which hydrogen gas is produced when it’s reacted with a strip of magnesium. The rate of reaction is a measure of change that happens in a single unit of time. When a reaction takes place the particles of the reactants collide. The more often the particles collide
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