This reflects the fact that above Tg they may be shaped or pressed into molds, spun or cast from melts or dissolved in suitable solvents for later fashioning. Is it a lot of space? A: Given:: Weight of patient = 100 lb Dose = 1Kg weight consume 1. Cooling a substance decreases molecular motion.
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However, some regions are expanding the range of plastics collected as markets become available. Amorphous polymers are usually less rigid, weaker and more easily deformed. Statistical Copolymers. 2 kg water to prepare 0. Would the water molecules be closer together or further apart? As shown in the following table, the densities of common plastics differ sufficiently to permit them to be discriminated in this fashion. Answer the questions in the table below about this molecule found. Plastics derived from natural materials, such as cellulose, starch and hydroxycarboxylic acids are more easily decomposed when exposed to oxygen, water, soil organisms and sunlight than are most petroleum based polymers. A: We have find out the names of indicated functional groups in the given molecule. Get premium membership. In aqueous solution, hydrazine is a base that can accept two protons: N, H4(ag) + H2O(1) 2….
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As the weight dispersion of molecules in a sample narrows, Mw approaches Mn, and in the unlikely case that all the polymer molecules have identical weights (a pure mono-disperse sample), the ratio Mw / Mn becomes unity. The high Tg and Tm values for the amorphous polymer Lexan are consistent with its brilliant transparency and glass-like rigidity. These are normally initiated at low temperature in methylene chloride solution. What is the molar mass of the…. Answer the questions in the table below about this molecule according. PLLA has a crystallinity of around 37%, a glass transition temperature between 50-80 ºC and a melting temperature between 173-178 ºC. A practical application of anionic polymerization occurs in the use of superglue. Tell students that one possible method is to use hot water and cold water and add food coloring to the water.
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Spectra is shown in letters and molecules are shown by numbers in the documents below, match them to each other and fill out the chart correctly please). 92 g sample of bacon is pureed in a blender with 100. Polymerization of isobutylene (2-methylpropene) by traces of strong acids is an example of cationic polymerization. The terminal functional groups on a chain remain active, so that groups of shorter chains combine into longer chains in the late stages of polymerization. Ask students to help you design an experiment to see if the speed of water molecules is different in hot water compared to cold water. Answer the questions in the table below about this molecule using. This way, if we notice something different between the two samples of water, we will know that the difference in temperature is causing it.
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The following illustration shows a cross-linked section of amorphous rubber. Students should realize that the molecules of hot water are moving faster. If the polymer chain is drawn in a zig-zag fashion, as shown above, each of the substituent groups (Z) will necessarily be located above or below the plane defined by the carbon chain. This, however, depends on using appropriate materials. The molecules of cold water are moving slower and are a little closer together. Compounds Flashcards. A: Given:- To determine:- Types of carbon (number). Q: A salt has a molar solubility of 48. Have students explain why hot water takes up more space than room temperature water.
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The catalyst formed by reaction of triethylaluminum with titanium tetrachloride has been widely studied, but other metals (e. V & Zr) have also proven effective. Radical polymerization gives a statistical copolymer. Q: How many carbon types are there in the molecule depicted below? What can we do to find out? Q: Give them name C=N c (CHs), NO2 CL.
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Thus, instead of consigning all plastic trash to a land fill, some of it may provide energy by direct combustion, and some converted for reuse as a substitute for virgin plastics. A: In case of drugs, absorption is a process through which drug enters into body of living organisms. It remains an open question whether it's more energy and cost efficient to use biodegradable plastic or to recycle petroleum-based plastic. Chain transfer reactions are especially prevalent in the high pressure radical polymerization of ethylene, which is the method used to make LDPE (low density polyethylene). For the molecule shown below, place a circle around the…. Polymers formed by a straightforward linking together of monomer units, with no loss or gain of material, are called addition polymers or chain-growth polymers. Students should draw the circles a little further apart than the circles in the room-temperature water. Solved] Complete the table below assigning each spectrum to the correct... | Course Hero. A partial structure for lignin is shown here. The first two equations illustrate the initiation process, and the last two equations are examples of chain propagation. The properties of a given polymer will vary considerably with its tacticity.
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Q: A patient weighing 100 lb must receive 1. Here the monomeric units are distributed in a regular alternating fashion, with nearly equimolar amounts of each in the chain: ~ABABABABABABABAB~. Have students answer questions about the animation and draw a model of water molecules on their activity sheet. You heat the water to 100 °C and notice that the volume increases to 104 milliliters. Check the box under each molecule in the table below that is an isomer of this molecule: - Brainly.com. When radical polymerization is desired, it must be started by using a radical initiator, such as a peroxide or certain azo compounds. Q: 1) Classify the following compounds as R or S? The importance of the first two factors is nicely illustrated by the differences between LDPE and HDPE. The abbreviations of the code are explained in the following table.
Comments, questions and errors should. Are the molecules moving faster in cold or hot water? A: Mechanism of a reaction is given below, Q: OH ОН What is this molecule's chemical formula? Despite use of the recycling symbol in the coding of plastics, there is consumer confusion about which plastics are readily recyclable. By using small amounts of initiators, a wide variety of monomers can be polymerized.
5 x 10 -3 M solution of a weak acid is 4. Most of the polymers described above are classified as thermoplastic. The energy potential of plastic waste is relatively significant, ranging from 10. Because of this, polymer molecular weights are usually given as averages. In these cases, the physically oriented morphology is stabilized and retained in the final product. In most communities throughout the United States, PETE and HDPE are the only plastics collected in municipal recycling programs. The activity sheet will serve as the "Evaluate" component of each 5-E lesson plan. This material is therefore softer, weaker, less dense and more easily deformed than HDPE. Since the plastics utilized in a given manufacturing sector (e. electronics, automotive, etc. ) Is there more space in between the molecules in hot water or in cold water? LDPE is a soft translucent solid which deforms badly above 75º C. Films made from LDPE stretch easily and are commonly used for wrapping. A: Molality: The number of moles of the solute dissolved in one kilogram of the solution is known as….
HDPE is a rigid translucent solid which softens on heating above 100º C, and can be fashioned into various forms including films. You could do that but it requires a hot plate, takes a fair amount of time, and may have to be done as a demonstration instead of being an activity the students can do. Question to investigate. Q: After preparing a sample of alum, K2SO4-Al2(SO4)3-24H2O, a student determined its purity….
HDPE is composed of macromolecules in which n ranges from 10, 000 to 100, 000 (molecular weight 2*105 to 3 *106). Q: How is the term "organic" used among farmers and food stores today? An engineered switch-grass that grows PHA inside its leaves and stems has also been created, offering the possibility of avoiding some of the costs associated with large scale bacterial fermentation. Q: (: (A) Write the name of five of the following compounds. Download the student activity sheet, and distribute one per student when specified in the activity. Placing such materials in a landfill results in a slower anaerobic decomposition, which produces methane, a greenhouse gas. Harvested amounts of PHA from the organism can be as high as 80% of the organism's dry weight.
Mass of solvent (Benzene) = 36. A: Given data, Percent yield=82. The latter is particularly attractive since a majority of plastics are made from petroleum, a diminishing resource with a volatile price. Virtually all of the monomers described above are subject to radical polymerization. It is important to keep all the variables the same except for the one you are testing. It is sometimes interpreted as the temperature above which significant portions of polymer chains are able to slide past each other in response to an applied force. All the monomers from which addition polymers are made are alkenes or functionally substituted alkenes. As the name suggests, side chains of a given monomer are attached to the main chain of the second monomer: ~AAAAAAA(BBBBBBB~)AAAAAAA(BBBB~)AAA~. The growing polymer chains are colored blue and red, and the hydrogen atom transferred in disproportionation is colored green. Tg often depends on the history of the sample, particularly previous heat treatment, mechanical manipulation and annealing. Lignin is the amorphous matrix in which the cellulose fibers of wood are oriented.
To increase the value of recovered PETE it may be depolymerized by superheated methanol into dimethyl terephthalate and ethylene glycol.
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