The Science and Engineering of Materials (MindTap Course List)
7th Edition
ISBN: 9781305076761
Author: Donald R. Askeland, Wendelin J. Wright
Publisher: Cengage Learning
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Chapter 1, Problem 1.19P
To determine
The process of determining whether a material is crystalline or amorphous.
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The crystalline density of polypropyleneis 0.946 g>cm3, and its amorphous densityis 0.855 g>cm3. What is the weight percentof the structure that is crystalline ina polypropylene that has a density of0.9 g>cm3?
You are given a sample of polypropylene and wish to find out the volume % crystallinity. You know that the density of 100% crystalline polypropylene (ρc) is 0.946 g/cm3, and the density of 100% amorphous polypropylene (ρa) is 0.855 g/cm3. Through your careful measurements, you determine the density of the sample (ρs) is 0.93 g/cm3. Use the following equation to determine the volume % crystallinity (ν) of your sample. Enter your answer with 1 decimal place.
Another sample of polypropylene has a 68 volume percent crystallinity. What is the density of the sample? Enter your answer is g/cm3.
I can answer the first part of the question. I just don't know how to do the second question?
The accompanying figure shows a unit cell for a hypothetical metal.
(a) To which crystal system does this unit cell belong?
(b) What would this crystal structure be called?
(c) Calculate the density of the material, given that its atomic weight is 145 g/mol.
+2
90°i
0.40 nm
+y
90°
90°
0.30 nm
- 0.30 nm
Chapter 1 Solutions
The Science and Engineering of Materials (MindTap Course List)
Ch. 1 - Define materials science and engineering (MSE).Ch. 1 - What is the importance of the engineering...Ch. 1 - Define the following terms: Composition;...Ch. 1 - Explain the difference between the terms materials...Ch. 1 - The myriad materials in the world primarily fall...Ch. 1 - What are some of the materials and mechanical...Ch. 1 - What is a ceramic, and what are some of the...Ch. 1 - comparisons between thermoplastics and...Ch. 1 - Give three examples of composites that can be...Ch. 1 - For each of the followign classes of materials,...
Ch. 1 - Describe the enabling materials property of each...Ch. 1 - Describe the enabling materials property of each...Ch. 1 - Prob. 1.13PCh. 1 - Prob. 1.14PCh. 1 - Prob. 1.15PCh. 1 - Temperature indicators are sometimes produced from...Ch. 1 - Prob. 1.17PCh. 1 - Prob. 1.18PCh. 1 - Prob. 1.19PCh. 1 - Prob. 1.20PCh. 1 - Steel is often coated with a thin layer of zinc if...Ch. 1 - Prob. 1.22PCh. 1 - Prob. 1.23PCh. 1 - Prob. 1.24PCh. 1 - You are an engineer working for a manufacturer of...Ch. 1 - We would like to produce a transparent canopy for...Ch. 1 - Prob. 1.27PCh. 1 - Prob. 1.28PCh. 1 - Prob. 1.29PCh. 1 - Prob. 1.30PCh. 1 - Prob. 1.31PCh. 1 - You would like to be able to identify different...Ch. 1 - You would like to be able to physically separate...Ch. 1 - Some pistons for automobile engines might be...Ch. 1 - • Convert 7750kg/m3tolb/ft3 using the Unit...Ch. 1 - • Using the basic search option in Knovel, find as...Ch. 1 - Prob. 1.3KP
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- Iron has a BCC crystal structure, an atomic radius of 0.124 nm, and an atomic weight of 55.85 g/mol. Compute its theoretical density and compare with its experimental density, which is 7.87 g/cm3. Which one is higher? O Experimental density is higher. O Not enough information to compute the theoretical density. O Theoretical density is higher. O Neither. Both are equal.arrow_forwardVanadium (V) has a BCC crystal structure. The atomic radius is R = 0.132 nm and the atomic mass is M = 50.94 g/mole. What is the density of Vanadium in g/mm3? Given: Avogadro’s Number NA = 0.6023 × 1024 (atoms/mole) Select one: a. 1.5 b. 0.021 c. 0.011 d. 0.0087 e. 0.00597arrow_forwardYou are given a sample of polypropylene and wish to find out the volume % crystallinity. You know that the density of 100% crystalline polypropylene (ρc) is 0.946 g/cm3, and the density of 100% amorphous polypropylene (ρa) is 0.855 g/cm3. Through your careful measurements, you determine the density of the sample (ρs) is 0.93 g/cm3. Use the following equation to determine the volume % crystallinity (ν) of your sample. Enter your answer with 1 decimal place. Answer is 82.4 Another sample of polypropylene has a 68 volume percent crystallinity. What is the density of the sample? Enter your answer is g/cm3. ( I need help with this second question. The answer is .917, i just can't get to that.) Hint: use the values and equation from the previous problem.arrow_forward
- Illustrate the difference between crystalline structure and amorphous structure using an examplearrow_forwardVanadium (V) has a BCC crystal structure. The atomic radius is R = 0.132 nm and the atomic mass is M = 50.94 g/mole. What is the density of Vanadium in g/mm ? Given: Avogadro's Number NA = 0.6023 x 1024 (atoms/mole) Select one: O a, 0.021 O b. 0.011 Oc.1.5 d. 0.0087 e. 0.00597 Potassium (K) has the Body-Centered Cubic (BC) crystal structune. The edge length is a = 0.533 nm. What is the linear density in atoms/nm along direction (01112 Select one: O ENG O O 0 00arrow_forwardYou are given the density of a metal as 2.07 g/cm³. You are advised the crystallographic structure is fcc, and the atomic mass is 25.5 g/mol. What is the atomic radius of the metal? a. 0.15 nm b. 0.12 nm c. 0.11 nm d. 0.18 nmarrow_forward
- Sometimes, in the equation for resolved shear stress in a single crystal, the term cos cos is termed the Schmid factor. Determine the magnitude of the Schmid factor for an FCC single crystal oriented with its [100] direction parallel to the loading axis.arrow_forwardProcedure You will do this experiment in two parts. In the first part, you will be provided data and asked to determine the crystal structure and lattice parameter that will allow you to identify the material. In the second part, you will be shown a strip of film from a diffraction camera. Using the film, you will determine the Bragg Angles, crystalline structure, and lattice parameter. Part 1 - During a lunar exploration an unknown metallic crystalline substance is discovered whose external morphology indicates that it is a cubic material. A diffraction pattern of this material, using radiation of wavelength 1.54Å, provides the following data: Bragg Diffraction Sin e, Sin' Diffraction Sine, Sin*e, Q? peak # angle. 19.1 #1 # 2 22.2 #3 32.2 # 4 38.8 #5 40.85 1. Construct a table similar to the one shown above. 2. Using the given diffraction data calculate sin 0 and sin? 0 for each diffraction peak. sin 0, sin $in' 3. Find the ratio of for each diffraction peak where sin² Oi, is the…arrow_forwardQ1/A Prove that the volume of an FCC unit cell, Vc is; Vc = 16R³√2 B) Explain in general terms, why many polymers and some ceramic glasses have an amorphous or semicrystalline structure.arrow_forward
- 3 Copper Unit Cell Uniqueness Here's a weird way to describe the structure of copper: Cu falls into the tetragonal crystal system with a = 0.256 nm, c = 0.362 nm = a√√2, and atoms located at 000 and. Its density is 8.94 g/cc at room temperature. (a) Draw a few adjacent units cells of the structure as described in this "weird" way. You should be able to see that there is a much more convenient way to describe the structure. What is it? (The point I wish to make is that there are many different unit cells that can be used to describe any given crystal, so we usually choose the one that is easiest to visualize.) (b) Calculate the radius of a copper atom using the above information. (c) Calculate the lattice parameter of the "better" unit cell of Cu.arrow_forwardQuestion 1: The density and associated percent crystallinity for two polypropylene materials are as follows: Crystallinity (%) 62.8 54.4 p (g/cm³) 0.904 0.895 (a) Compute the densities of totally crystalline and totally amorphous polypropylene. (b) Determine the density of a specimen having 74.6% crystallinity. (c) Determine the percent crystallinity of a specimen having a density of 1.382 g/cm³arrow_forwardAssume we have to accommodate 18 million books, each of which has 1 billion characters. If each character can be written using 100atoms, and if the bulk atoms can be used, calculate the size of an object (in nanometers) that can accommodate all the 18 million books. Assume one atom occupies a space which is 0.25 nm in sizearrow_forward
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