If Ag nanocubes, tetrahedra, octahedra, and nanospheres are suspended in water with no capping agent on their surfaces. Assuming that these individual nanocrystals have the same mass, which one of them is most susceptible to shape transformation in water? Justify your answer.
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If Ag nanocubes, tetrahedra, octahedra, and nanospheres are suspended in water with no capping agent on their surfaces. Assuming that these individual nanocrystals have the same mass, which one of them is most susceptible to shape transformation in water? Justify your answer.
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- High-density polyethylene (HDPE) is opaque while low-density polyethylene (LDPE) is transparent. Which form of PE is mechanically more flexible? Justify your answer.At room temperature, the edge length of the cubic unit cell in elemental silicon is 5.431 Å, and the density of silicon at the same temperature is 2.328 g cm-3 . Each cubic unit cell contains eight silicon atoms. Using only these facts, perform the following operations.(a) Calculate the volume (in cubic centimeters) of one unit cell.(b) Calculate the mass (in grams) of silicon present in a unit cell.(c) Calculate the mass (in grams) of an atom of silicon.(d) The mass of an atom of silicon is 28.0855 u. Estimate Avogadro’s number to four significant figures.Why are isotactic or syndiotactic polymers often more attractive for materials development?
- 6. A compound consists of A-atoms and B-atoms, and its solid crystal forms a cubic unit cell structure, as shown below. A-atoms occupy corners and faces of the cube. B-atoms are inside the cube and are not shared by adjacent cubic unit cells. Based on the information here, we can conclude that (a) A-atoms form an FCC structure; the empirical formula of the compound is A,B2. (b) A-atoms form an FCC structure; the empirical formula of the compound is AB. (c) A-atoms form a BCC structure; the empirical formula of the compound is A¬B2. (d) A-atoms form a BCC structure; the empirical formula of the compound is AB. (e) None of the above. A-atoms (corners and faces) B-atoms (inside, not shared) a m n T OF THE FL EMENTSWrite balanced net ionic equation for Na3PO4(aq)+NiCl2(aq)→Ni3(PO4)2(s)+NaCl(aq). Express your answer as a chemical equation. Identify all of the phases in your answer.Write balanced complete ionic equation for Na3PO4(aq)+NiCl2(aq)→Ni3(PO4)2(s)+NaCl(aq). Express your answer as a chemical equation. Identify all of the phases in your answer.
- The monomer of PVC (polyvinyl chloride) has the formula C2H3Cl. (Cl=35.45 g/mol). If there are 1565 repeat units in a single chain of the polymer, what is the molecular mass (in amu) of that chain?1. Simple Cubic Unit Cell a. Consider one unit cell and assume the length of the side of the cube is "a". Remember that “a" is the distance between the centers of two adjacent atoms. How long is “a", the edge of a unit cell, in terms of radius, r, of an atom? b. A simple cubic cell has the equivalent of only 1 atom. Recall the volume of sphere with radius, r, is expressed as V = 4/3 r. With this information, find the total volume of all the spheres in this unit cell, expressed in terms of r. To do this, take the total number of atoms and multiply it by the volume of one atom, with radius, r) c. Find the volume of the entire unit cell including the empty space in terms of r. Remember for a cube the volume, V=1 xw xh. You already know the edge length of the side in terms of "r" based in the earlier questions. d. Find the fraction of the total volume of the cube (which is the unit cell's volume) is occupied by the atoms. Express this as percent and write your answer in the summary table.Explain why an elastomer under tensile load contracts on heating. Compare this with the behaviour of ordinary materials .
- Activity 2: 1. Refer to the chart below on physical properties of matter. Answer the questions and relate the intermolecular forces present among the species to explain the different properties exhibited by the substances. Melting and Boiling Points Molar Mass, g/mol Substance Melting Point, K Boiling Point, K Fluorine (F2) 38 53 85 Bromine (Br2) 160 266 332 Astatine (At2) 420 575 610 a. Which substance has the highest melting and boiling points? b. What intermolecular forces of interactions are present in each of the substances? c. How do the intermolecular forces present relate to the size of the substance? d. How do the strength of the intermolecular forces present in each species compare to each other? e. How does the strength of the intermolecular forces relate to the boiling and melting points of the substances?Tungsten B is a solid phase of tungsten still unknown to science. The only difference between it and ordinary tungsten is that Tungsten B forms a crystal with an fcc unit cell and a lattice constant a=0.387 nm. Calculate the density of Tungsten B. Round your answer to 3 significant digits. 0 g cm 3 x10 ŚWhy is the C 60form of carbon called buckminsterfullerene?