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Give at least one (1) use of the following listed element/material in maritime application.
- Zinc (Zn)
- Aluminum (Al)
- Lead (Pb)
- Copper (Cu
- Tin (Sn)
- Titanium (Ti)
- Chromium (Cr)
- Nickel (Ni)
- Brass
- Bronze
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- Consider the following list of chemicals. For each compound, provide the meaning of their chemical safety symbols and describe its required storage protocol. (Example: Acetone, flammable & harmful, store in cupboard for flammable liquids Benzoic acid DichloromethaneEthanolHydrochloric acid Hydrogen peroxide MethanolNitric acid (fuming) Potassium cyanide Sodium hydroxide Sulphuric acidA lecture hall contains 12 rows of seats. If the professor releases laughing gas (N2O) from the front of the room and tear gas (C6H11OBr) simultaneously from the back of the room, in which row are the students apt to start and to cry simultaneously?Ceramics used as abrasives must be hard and tough and be able to withstand high temperatures that arise from frictional forces. What is the minimum required hardness (measure in Mohs scale) for a material to be used as abrasive? Your answer
- Write balanced net ionic equation for CaS(aq)+ZnCl2(aq)→ZnS(s)+CaCl2(aq). Express your answer as a chemical equation. Identify all of the phases in your answer. Write balanced complete ionic equation for NaOH(aq)+HC2H3O2(aq)→H2O(l)+NaC2H3O2(aq) Express your answer as a chemical equation. Identify all of the phases in your answer. Write balanced net ionic equation for NaOH(aq)+HC2H3O2(aq)→H2O(l)+NaC2H3O2(aq) Express your answer as a chemical equation. Identify all of the phases in your answer.Much of Earth's history can be unraveled studying sulfur. Sulfur can be used as "geothermometer". The ratios of stable sulfur isotopes change with the temperature of Earth's processes. For example, igneous systems deep inside the Earth occur at very high temperatures, hydrothermal systems occur at intermediate conditions, and sedimentary rock weathering occurs at low temperatures. The composition of stable sulfur isotopes varies across the 1000 degree temperature range. 10. How many peaks would be seen in the mass spectra for such a study? Make a basic sketch (bar chart) a.m.u. vs % natural abundance and label each peak's a.m.u. and % natural abundance.Write the net ionic equation for 3HNO3(aq)+Al(OH)3(S) = Al(NO3)3(aq)+3H2O(l) Express your answer as a balanced net ionic equation. Identify all of the phases in your answer.
- The apparatus shown in the figure below was used in a series of experiments. A cotton ball soaked in either hydrochloric acid (HCl) or acetic acid (CH3COOH) was placed at one end. Another cotton ball soaked in one of three amines (a class of nitrogen compounds)–-[CH3NH2, (CH3)2NH, or (CH3)3N] was placed on the other end Which combination of acid and amine would produce a ring closest to the amine end of the tube? Choose one or more: HCl CH3COOH CH3NH2 (CH3)2NH (CH3)3N2a and 2bThe cation exchange for Zinc (Zn*2) in soil is 29.4 mEq per 100 grams of soil. Determine the mass of Zinc (Zn) in grams (g) that would be found in 278 grams of soil. Assume all of the ionic exchange sites are saturated with zinc. Report answer to 3 significant digits. The molar mass of Zinc (Zn) is 65.38 g/mole. Zn --> Zn 2 + 2e
- Before slow cooking a meat (for example, in a crockpot/slow-cooker) you will often find instructions to sear the meat on high heat in an oiled skillet for a few minutes before transferring it to the crockpot. The searing is brief – not long enough to cook the meat thoroughly. Despite myth/legend, the searing will not “seal in the juices”. What is the searing for?Consider Copper (Cu), Silver (Ag), Silicon (Si), Aluminum oxide (Al2O3), silicon carbide (SiC), and polyvinyl chloride (PVC). Please select the correct answers. (There may be more than 1 correct answer!). (a) Cu and Ag are metal and have metallic bonding. Si, and Al2O3 are ceramic. PVC is polymer. (b) Cu, Ag and Si are metal. Cu and Ag have metallic bonding, but Si has covalent bonding. SiC and Al2O3 are ceramic with covalent and ionic bonding, respectively. (c) Electrical conductivity: Ag > Cu > Si > Al2O3 > PVC (d) Cu and Ag have FCC structure. Si and SiC have diamond-type structure.The two sides of the DNA double helix are connected by pairs of bases (adenine, thymine, cytosine, and guanine). Because of the geometric shape of these molecules, adenine bonds with thymine and cytosine bonds with guanine. The figure (Figure 1) shows the thymine-adenine bond. Each charge shown is ±e, and the H−N distance is 0.110 nm. A) Calculate the net force that thymine exerts on adenine. To keep the calculations fairly simple, yet reasonable, consider only the forces due to the O−H−N and the N−H−N combinations, assuming that these two combinations are parallel to each other. Remember, however, that in the O−H−N set, the O− exerts a force on both the H+ and the N−, and likewise along the N−H−N set. B) Is the net force attractive or repulsive? C) Calculate the force on the electron in the hydrogen atom, which is 5.29×10−2 nm from the proton. D) Compare the strength of the bonding force of the electron in hydrogen with the bonding force of the adenine-thymine molecules.
