Question 1

Which type of chemical bonding is most important in plastics?&#10;A) metallic&#10;B) ionic&#10;C) hydrogen&#10;D) covalent

Accepted Answer

Covalent bonding is most important in plastics because plastics are composed of long chains of carbon atoms (and often other elements) that are bonded together through covalent bonds. These strong bonds give plastics their structure and durability.

Question 2

As the number of carbons in the backbone of a hydrocarbon increases, the molecules get longer and longer and the substance is most likely to be a ____.&#10;A) solid&#10;B) gas&#10;C) liquid&#10;D) vapor

Accepted Answer

As the number of carbons increases, the molecular weight and van der Waals forces increase, making the substance more likely to be a solid at room temperature.

Question 3

Unsaturated molecules contain some ____ bonds.&#160;&#10;A) hydrogen&#10;B) metallic&#10;C) double&#10;D) ionic

Accepted Answer

Unsaturated molecules contain double (or triple) bonds between carbon atoms, allowing them to add more atoms in reactions, unlike saturated molecules which only have single bonds.

Question 4

The process of ____ usually involves applying controlled heating of parts of plastics.&#10;A) orientation&#10;B) crystallization&#10;C) uncoiling&#10;D) annealing

Accepted Answer

Annealing involves applying controlled heating (and sometimes cooling) to materials, including plastics, to relieve internal stresses, improve strength, or change their physical properties.

Question 5

Plastics always contain the element ____.&#10;A) carbon&#10;B) silicon&#10;C) oxygen&#10;D) nitrogen

Accepted Answer

Plastics are polymers, which are large molecules composed of repeating units, and these units are primarily based on carbon chains or rings, making carbon a fundamental element in all plastics.

Question 6

This configuration is of the hydrocarbon, ____.&#160;&#160;&#10;&#160;&#10; &#10;A) methane&#10;B) pentane&#10;C) octane&#10;D) hexane

Accepted Answer

The answer of This configuration is of the hydrocarbon, ____.&#160;&#160;&#10;&#160;&#10;...

Question 7

Rigid thermosets often find applications in ____ environments.&#10;A) high-heat&#10;B) moist&#10;C) frigid&#10;D) extremely dry

Accepted Answer

Rigid thermosets are suitable for high-heat environments due to their excellent thermal stability and resistance to deformation under heat.

Question 8

In an amorphous molecular structure of plastic, the appearance of the plastic will always be ____.&#10;A) reflective&#10;B) opaque&#10;C) transparent&#10;D) translucent

Accepted Answer

Amorphous molecular structures in plastics allow light to pass through because there are no crystalline regions to scatter the light, making the material transparent.

Question 9

Examples of a flexible thermosets is/are ____.&#10;A) hydrofoils&#10;B) automobile hoods&#10;C) safety glass&#10;D) foams for car seats

Accepted Answer

Thermosets are a type of polymer that become irreversibly hard upon heating. However, certain thermosets can be made flexible for specific applications, such as foams for car seats, which provide both comfort and safety by absorbing impacts.

Question 10

The joining together of many mers is known as ____.&#10;A) a homopolymer&#10;B) paraffin&#10;C) ethane&#10;D) polymerization

Accepted Answer

Polymerization is the process of joining together many mers (monomers) to form a polymer.

Question 11

An example of a plastics product that shows orientation in its stretch differences, stretching easily in the crosswise direction, but not so readily lengthwise is ____.&#10;A) PVC&#10;B) teflon tape&#10;C) duct tape&#10;D) Shrinky-Dinks&#174;

Accepted Answer

The answer of An example of a plastics product that...

Question 12

An example of a plastics product that shows a biaxial orientation in that it will stretch in two directions if heated is ____.&#10;A) PVC&#10;B) teflon tape&#10;C) a pop bottle&#10;D) thin film labels

Accepted Answer

The answer of An example of a plastics product that...

Question 13

Plastics that consist of disconnected hydrocarbon chains are called ____.&#10;A) biaxial plastics&#10;B) cross links&#10;C) thermosets&#10;D) thermoplastics

Accepted Answer

The answer of Plastics that consist of disconnected hydrocarbon chains...

Question 14

Which combination of atoms represents a permanent dipole?&#10;A) a carbon-fluorine single bond&#10;B) a carbon-fluorine double bond&#10;C) a nitrogen-hydrogen single bond&#10;D) a carbon-OH single bond

Accepted Answer

The answer of Which combination of atoms represents a permanent...

Question 15

Which saturated hydrocarbons molecule contains three carbon atoms?&#10;A) butane&#10;B) propane&#10;C) methane&#10;D) octane

Accepted Answer

The answer of Which saturated hydrocarbons molecule contains three carbon...

Question 16

When two or more atoms combine, the resulting structure is known as a(n) ____.&#10;A) isomer&#10;B) molecule&#10;C) isotope&#10;D) polymer

Accepted Answer

The answer of When two or more atoms combine, the...

Question 17

When hydrocarbon molecules have only single covalent bonds, they are considered ____.&#10;A) saturated&#10;B) hydrolyzed&#10;C) monounsaturated&#10;D) polyunsaturated

Accepted Answer

The answer of When hydrocarbon molecules have only single covalent...

Question 18

In PVC, a ____ atom replaces one hydrogen atom per mer.&#10;A) sodium&#10;B) sulfur&#10;C) bromine&#10;D) chlorine

Accepted Answer

The answer of In PVC, a ____ atom replaces one...

Question 19

An intermolecular interaction in which molecules or portions of molecules exhibit polarity is known as a(n) ____.&#10;A) Van der Waals force&#10;B) dipole interaction&#10;C) hydrogen bond&#10;D) ionic bond

Accepted Answer

The answer of An intermolecular interaction in which molecules or...

Question 20

When crystalline plastics are melted, the crystalline regions unfold, and the entire structure becomes ____.&#10;A) annealed&#10;B) polarized&#10;C) amorphous&#10;D) uniaxial

Accepted Answer

The answer of When crystalline plastics are melted, the crystalline...

Question 21

A benzene molecule has the shape of a ____. &#160;&#160;&#10;A) straight chain&#10;B) ring&#10;C) kinked chain&#10;D) crystal

Accepted Answer

The answer of A benzene molecule has the shape of...

Question 22

How many carbon atoms does decane have?&#10;A) 2&#10;B) 5&#10;C) 8&#10;D) 10

Accepted Answer

The answer of How many carbon atoms does decane have?&#10;A)...

Question 23

Which molecule is a solid? &#160;&#10; &#10;A) polethylene&#10;B) methane&#10;C) ethane&#10;D) pentane

Accepted Answer

The answer of Which molecule is a solid? &#160;&#10; &#10;A)...

Deck 3: Elementary Polymer Chemistry