04 Classification of Material Problem Set

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CLASSIFICATION OF MATERIAL | PRACTICE PROBLEMS Complete the following to reinforce your understanding of the concept covered in this module.

PROBLEM 1: Which of the following statements is false? A. Ceramics are inorganic, nonmetallic solids that are processed or used at high temperatures. B. Metals are chemical elements that form substances that are opaque, lustrous, and good conductors of heat and electricity. C. Oxides, carbides, and nitrides are considered to be within the class of materials known as glasses. D. Most metals are strong, ductile, and malleable. In general, they are heavier than most other substances.

SOLUTION 1: The classes of materials are ceramic, metals, and polymers. Oxides, carbides, nitrides, and glasses are all ceramics.

Therefore, the correct answer choice is C. Oxides, carbides, and nitrides are considered to be within the class of materials known as glasses.



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PROBLEM 2: Which of the following is not a characteristic of ceramic materials? A. πΌπ‘œπ‘›π‘–π‘ π΅π‘œπ‘›π‘‘π‘  B. πΏπ‘œπ‘€ πΈπ‘™π‘’π‘π‘‘π‘Ÿπ‘–π‘π‘Žπ‘™ π‘…π‘’π‘ π‘–π‘ π‘‘π‘Žπ‘›π‘π‘’ C. πΆβ„Žπ‘’π‘šπ‘–π‘π‘Žπ‘™π‘™π‘¦ πΌπ‘›π‘’π‘Ÿπ‘‘ D. π΅π‘Ÿπ‘–π‘‘π‘‘π‘™π‘’

SOLUTION 2: The TOPIC OF CERAMICS is not provided in the NCEES Supplied Reference Handbook, Version 9.4 for Computer Based Testing. Therefore, we must memorize these concepts and understand their application independent of the NCEES Supplied Reference Handbook. We know that ceramics are classified as having HIGH electrical resistance. Therefore, answer choice β€œπ΅β€ is incorrect, and ceramics do not have low electrical resistance.

Therefore, the correct answer choice is B. π‘³π’π’˜ π‘¬π’π’†π’„π’•π’“π’Šπ’„π’‚π’ π‘Ήπ’†π’”π’Šπ’”π’•π’‚π’π’„π’†.



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PROBLEM 3: Molecules of a polymer are not held together by which of the following bonds? A. π»π‘¦π‘‘π‘Ÿπ‘œπ‘”π‘’π‘› π΅π‘œπ‘›π‘‘π‘  B. π‘ƒπ‘Ÿπ‘–π‘šπ‘Žπ‘Ÿπ‘¦ π΅π‘œπ‘›π‘‘π‘  C. π‘†π‘’π‘π‘œπ‘›π‘‘π‘Žπ‘Ÿπ‘¦ π΅π‘œπ‘›π‘‘π‘  D. πΆπ‘œπ‘£π‘Žπ‘™π‘’π‘›π‘‘ π΅π‘œπ‘›π‘‘

SOLUTION 3: The TOPIC OF POLYMERS can be referenced under the topic of PROPERTIES OF MATERIALS on page 65 of the NCEES Supplied Reference Handbook, Version 9.4 for Computer Based Testing. Covalent bonding occurs in chemical reactions of the displacement type. The rest of the bonds are internal hydrocarbon bonds.

Therefore, the correct answer choice is D. π‘ͺ𝒐𝒗𝒂𝒍𝒆𝒏𝒕 𝑩𝒐𝒏𝒅𝒔



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PROBLEM 4: The rigidity of a polymer can be increased by which of the following methods? A. πΌπ‘›π‘π‘Ÿπ‘’π‘Žπ‘ π‘–π‘›π‘” π‘‘β„Žπ‘’ π‘‘π‘’π‘”π‘Ÿπ‘’π‘’ π‘œπ‘“ π‘π‘œπ‘™π‘¦π‘šπ‘’π‘Ÿπ‘–π‘§π‘Žπ‘‘π‘–π‘œπ‘› B. πΌπ‘›π‘π‘Ÿπ‘’π‘Žπ‘ π‘–π‘›π‘” π‘‘β„Žπ‘’ 𝑒π‘₯𝑑𝑒𝑛𝑑 π‘œπ‘“ π‘π‘Ÿπ‘œπ‘ π‘  π‘™π‘–π‘›π‘˜π‘–π‘›π‘” C. πΆπ‘Ÿπ‘¦π‘ π‘‘π‘Žπ‘™π‘™π‘–π‘§π‘Žπ‘‘π‘–π‘œπ‘› D. 𝐴𝑙𝑙 π‘œπ‘“ π‘‘β„Žπ‘’ π‘Žπ‘π‘œπ‘£π‘’

SOLUTION 4: The TOPIC OF POLYMERS can be referenced under the topic of PROPERTIES OF MATERIALS on page 65 of the NCEES Supplied Reference Handbook, Version 9.4 for Computer Based Testing. The rigidity of a polymer increases with increasing length of the molecules, with the formation of network structure, and with the formation of crystalline regions in the polymer. Thus, all of the answers are correct.

Therefore, the correct answer choice is D. 𝑨𝒍𝒍 𝒐𝒇 𝒕𝒉𝒆 𝒂𝒃𝒐𝒗𝒆



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PROBLEM 5: In molecules of the same composition, what are variations of atomic arrangements known as? A. πΌπ‘ π‘œπ‘šπ‘’π‘Ÿπ‘  B. π‘π‘œπ‘› βˆ’ π‘π‘Ÿπ‘¦π‘ π‘‘π‘Žπ‘™π‘™π‘–π‘›π‘’ π‘†π‘‘π‘Ÿπ‘’π‘π‘‘π‘’π‘Ÿπ‘’π‘  C. π‘€π‘œπ‘›π‘œπ‘šπ‘’π‘Ÿπ‘  D. π‘ƒπ‘œπ‘™π‘¦π‘šπ‘’π‘Ÿπ‘ 

SOLUTION 5: ISOMERS are molecules that have the same composition, but different atomic arrangements.

Therefore, the correct answer choice is A. π‘°π’”π’π’Žπ’†π’“π’”



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PROBLEM 6: Which statement(s) describe(s) the glass transition temperature? I.

It is the temperature at which the rate of volume contraction decreases abruptly.

II.

It is the temperature at which residual stresses in the glass can be relieved.

III.

It is the point where the material behaves more like a solid than viscous liquid.

A. 𝐼 π‘œπ‘›π‘™π‘¦ B. 𝐼 π‘Žπ‘›π‘‘ 𝐼𝐼 C. 𝐼 π‘Žπ‘›π‘‘ 𝐼𝐼𝐼 D. 𝐼𝐼 π‘Žπ‘›π‘‘ 𝐼𝐼𝐼

SOLUTION 6: The VOLUME-TEMPERATURE CURVE can be referenced under the topic of AMORPHOUS MATERIALS on page 65 of the NCEES Supplied Reference Handbook, Version 9.4 for Computer Based Testing. The glass transition temperature is the point at which the free movement of the glass molecules past each other becomes difficult. The glass begins to act like a solid, increasing in specific volume.

Therefore, the correct answer choice is C. 𝑰 𝒂𝒏𝒅 𝑰𝑰𝑰



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PROBLEM 7: What is the melting point of mercury? A. βˆ’38 B. 84 C. 86 D. 312

SOLUTION 7: The TABLE OF PROPERTIES OF METALS can be referenced under the topic of PROPERTIES OF MATERIALS on page 61 of the NCEES Supplied Reference Handbook, Version 9.4 for Computer Based Testing. For this question, you will simply go to the table displaying the properties of metals in the reference handbook, and then look up the element MERCURY, and find it has the symbol 𝐻𝑔. Looking at the table for mercury, we find mercury has a melting point of βˆ’38.



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Therefore, the correct answer choice is 𝑨. βˆ’πŸ‘πŸ–



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PROBLEM 8: What is the density of the metal represented by the symbol β€œπ‘ƒπ‘β€? A. 5,776 B. 6,692 C. 11,343 D. 13,547

SOLUTION 8: The TABLE OF PROPERTIES OF METALS can be referenced under the topic of PROPERTIES OF MATERIALS on page 61 of the NCEES Supplied Reference Handbook, Version 9.4 for Computer Based Testing. For this question, you will simply go to the table displaying the properties of metals in the reference handbook, and then look up the symbol β€œπ‘ƒπ‘β€. Upon looking at the table we see that β€œπ‘ƒπ‘β€ is the symbol for LEAD, and has corresponding properties for that metal. Looking at the table for lead, we find lithium has a density of 11,343.



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The correct answer is π‘ͺ. 𝟏𝟏, πŸ‘πŸ’πŸ‘



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PROBLEM 9: Thermoset polymers show which of the following traits? A. π·π‘’π‘π‘œπ‘šπ‘π‘œπ‘ π‘’ π‘œπ‘› β„Žπ‘’π‘Žπ‘‘π‘–π‘›π‘” B. π‘†π‘œπ‘“π‘‘π‘’π‘› π‘œπ‘› β„Žπ‘’π‘Žπ‘‘π‘–π‘›π‘” C. π»π‘Žπ‘Ÿπ‘‘π‘’π‘› π‘œπ‘› β„Žπ‘’π‘Žπ‘‘π‘–π‘›π‘” D. π‘π‘œπ‘›π‘’ π‘œπ‘“ π‘‘β„Žπ‘’ π‘Žπ‘π‘œπ‘£π‘’

SOLUTION 9: The TOPIC OF THE CLASSIFICATION OF POLYMERS can be referenced under the topic of POLYMERS on page 65 of the NCEES Supplied Reference Handbook, Version 9.4 for Computer Based Testing. Thermoset polymers decompose on heating.

Therefore, the correct answer choice is 𝑨. π‘«π’†π’„π’π’Žπ’‘π’π’”π’† 𝒐𝒏 π’‰π’†π’‚π’•π’Šπ’π’ˆ



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PROBLEM 10: What is the process when polymer chains form into regular patterns that reduce volume? A. π‘‰π‘’π‘™π‘π‘Žπ‘›π‘–π‘§π‘Žπ‘‘π‘–π‘œπ‘› B. πΆπ‘Ÿπ‘œπ‘ π‘  βˆ’ π‘™π‘–π‘›π‘˜π‘–π‘›π‘” C. πΆπ‘Ÿπ‘¦π‘ π‘‘π‘Žπ‘™π‘™π‘–π‘§π‘Žπ‘‘π‘–π‘œπ‘› D. π΄π‘™π‘–π‘”π‘›π‘šπ‘’π‘›π‘‘

SOLUTION 10: The TOPIC OF THE CLASSIFICATION OF POLYMERS can be referenced under the topic of POLYMERS on page 65 of the NCEES Supplied Reference Handbook, Version 9.4 for Computer Based Testing. CRYSTALLIZATION is the process when polymer chains form into regular patterns that reduce volume.

Therefore, the correct answer choice is π‘ͺ. π‘ͺπ’“π’šπ’”π’•π’‚π’π’π’Šπ’›π’‚π’•π’Šπ’π’



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