Lab Quiz - fiber test

Question 1

Cotton, Rayon

Answer 1

These cellulosic fibers does not shrink away from the flame, Ignites on contact, burns quickly, continues to burn, emits an odor of burning papr, and leaves behind gray feather ash.

Question 2

Cotton

Answer 2

This fiber under a microscope has a flat and twisted ribbon, has convolutions, and has central lumen.

Question 3

Rayon

Answer 3

This fiber under a microscope has striations and is rod-like.

Question 4

Wool, silk

Answer 4

These protien fibers curl away from the flame, burn slowly, are self-extinguishing, emit an odor of burning hair, and forms a crushable black bead.

Question 5

Wool

Answer 5

This fiber under a microscope has a rough surface with overalapping scales, and is rod like.

Question 6

Silk

Answer 6

This fiber under a microscope has a smooth surface with uneven width, and is translucent.

Question 7

Acetate, Acrylic

Answer 7

These thermoplastic I fibers, fuse away from the flame, burn rapidly, continues to burn and melt when removed from the flame, has an odor of chemicals, and forms a hard, black bead.

Question 8

Acetate

Answer 8

This fiber under a microscope has striations and is rod-like. In acetone, it dissolves.

Question 9

Acrylic, nylon, polyester

Answer 9

These fibers under a microscope have a smooth surface with uneven width, and are translucent.

Question 10

Nylon, polyester

Answer 10

These thermoplastic II fibers fuse, melt, and shrink away from the flame, burns slowly while melting, is self extinguishing, emits a chemical odor, and forms a hard and tough black or brown bead.

Question 11

Polyester

Answer 11

This fiber doesn’t dissolve in any chemical solution.

Question 12

Nylon

Answer 12

This fiber does not dissolve in acetone, but does dissolve in hydrochloric acid.

Question 13

Scale

Answer 13

Overlapping plates on animal fibers.

Question 13

Acrylic

Answer 13

This fiber does not dissolve in acetone or hydrocholoric acid, but does dissolve in nitric acid.

Question 14

Striation

Answer 14

Line or shadow seen in longitudinal fiber due to an irregular cross section.

Question 15

Node

Answer 15

Joint in bast fibers similar in appearance when magnified to those found in bamboo.

Question 16

Lumen

Answer 16

Central canal found in cotton and flax fibers.

Question 17

Medulla

Answer 17

Void or opening in some types and qualities of animal fibers; may be continuous or interrupted; present only to a limited extent in fine wool fibers.

Question 18

Delusterant

Answer 18

Titanium dioxide added to manufactured fibers to control the amount of luster.