HKDSE CHEMISTRY – A Modern View (Chemistry) Coursebook 3 Suggested answers Chapter 25 Simple molecular substances with non-octet structures and shapes of simple molecules Page Number Class Practice 1 Chapter Exercise 2 Chapter 26 Bond polarity Class Practice 4 Chapter Exercise 5 Chapter 27 Intermolecular forces Class Practice 7 Chapter Exercise 9 Chapter 28 Structures and properties of molecular crystals Class Practice 11 Chapter Exercise 12 Part Exercise 14 Chapter 29 Chemical cells in daily life
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molecules be exposed to hydrogen peroxide. This will result in the rate of reaction increasing because it increases the chance of more successful collisions between the enzyme and the substrate. Catalase is an enzyme found in food such as‚ potato. It is used to break down a poisonous by-product of metabolism called hydrogen peroxide. Hydrogen peroxide is a compound that can kill cells therefore; it is essential that our body can break it up. Catalase breaks down hydrogen peroxide into oxygen and
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attraction between three water molecules. | w. | Negative charge oxygen atom | | x. | Positive charged oxygen atom | | y. | Weak hydrogen bond between δ+ and δ- parts of neighboring water molecules. | | z. | Strong hydrogen bond | | δ- | Slight negative charge as large oxygen atom attracts shared electrons closer to itself than the hydrogen atom. | | δ+ | | Extension: at this point you might want to consider how ionic and covalent bonding work‚ in order to really understand
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intermolecular forces of the hydrogen bonds I would compare it to a magnet‚ the chains are attracted to each other like the attraction between magnets and their hard to pull apart. 2. Provide three chemical reasons why Kevlar is much stronger than other polymers * On reason Kevlar is stronger than other polymers is because of their strong intermolecular hydrogen bonds. Unlike the van der Waals interactions that are found in other polymers‚ because of hydrogen bonding there are very strong
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applications in areas such as chemical preparation‚ crystals engineering and non linear optics. One tactic commonly employed in the synthesis of potential inclusion hosts is the incorporation of functional groups known to participate in relatively strong hydrogen bonding interactions (such as O-H‚ N-H and CO2H moieties) into rigid and bulky molecular frameworks. The presence of symmetry elements within the lot of crystals that seems like needle appearance. Those crystals that formed above the filter paper
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Municipal bonds are debt obligations issued by states‚ cities‚ counties and other governmental entities to raise money to build schools‚ highways‚ hospitals and sewer systems‚ as well as many other projects for the public good. When you purchase a municipal bond‚ you are lending money to an issuer who promises to pay you a specified amount of interest (usually paid semi-annually) and return the principal on a specific maturity date. Not all municipal bonds offer tax exemptions from both federal
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Abacus Inc. has asked you price a 5 year bullet bond issue for them‚ with Price‚ Yield to Maturity and Modified Duration. There are no comparable existing issues in the secondary market either by Abacus or a competitor and so you will need to price the issue from scratch. You have the following set of US Treasury bond data and consultations with your Bank Equity Analyst and Debt Analyst suggest that a Z-spread for Abacus of 200 bps over Treasuries and a coupon rate of 6.5% should be appropriate
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Words: 893 Recently‚ one of my good friend has inherited ￡20‚000 and wants to invest this amount of money in financial market‚ in other words‚ she is planning to buy some financial products such as equities‚ bonds and currencies. She has asked me for some guidance. In my opinion‚ I think diversifying portfolio would be the best way to get a higher return. In this essay‚ I will explain the concept and benefits of diversification in financial markets. However‚ even with a diversified portfolio of
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Looking back at the research question‚ the actual amount of reactant did not match the theoretical stoichiometric amounts according to the balanced equation‚ but the amount of catalyst matched the original value when uncertainty is taken into account. The percent yields for the reactants in the equation are very far from 100% yield. In the case of water‚ the percent yield came out to be meaning there were at least 2 times to 4 times more water than there should be. The percent yield of oxygen came
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Hydrogen has a high specific energy‚ high flame speed‚ wide range of flammability‚ and clean burning characteristics which suggest a possibility of high performance in internal combustion engines (ICE). These attributes have been realized for more than half a century since the onset of hydrogen engine development. In the early 1990s‚ FSEC conducted research on using hydrogen in an ICE. This work resulted in the development of a mixed fuel called HYTEST. Today‚ automobile manufacturers and DOE continue
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