Con Chem Quiz

• Widely used for imparting color to textiles?

  Dyes
• Dyes can be produced from either _ or _ resources?

  natural and synthetic
• Unlike ___________ dyes do not build upon the materials surface but are absorbed in the fiber's pores?

  paint(pigments)
• Dye molecules are smaller than the size of the pores of the fibers. T or F?

  T
• Dyes absorb light in all the spectrums? T or F?

  F, it only absorbs light in the visible spectrum
• it is the visible spectrum of light?

  (400-700nm)
• it is a color-bearing group?

  chromophore
• Dyes have atleast one chromophore? T or F?

  T
• alternating double and single bonds?

  Conjugated system
• Dyes do not exhibit resonance of electrons? T or F?

  F, they do exhibit resonance of electrons
• it is derived from the Latin word textilis?

  Textiles
• It's a french word roughly translated as "to weave"?

  texer
• it is any filament, fiber, yarn, that is made into clothes or fabric?

  Textiles
• It shifts the color of the dye?

  Auxochrome
• it is aka "color helpers"?

  Auxochrome
• It attaches the dye to the fibers?

  Auxochrome
• It is often used to influence the dye solubility?

  Auxochrome
• Examples of Auxochromes?

  Carboxylic Acid, Sulfuric Acid, Amino, Hydroxyl Groups
• It is known as "red shift"?


  Bathochromic Shift
• it increases the absorption and intensity of the color?

  Bathochromic Shift
• a long wavelength means a _____ energy?

  lower
• it is aka "blue shift"?

  Hypsochromic Shift
• it decreases the absorption and intensity of the color?

  Hypsochromic Shift
• shorter wavelength mean a ______ energy?

  Higher
• It is the first synthetic dye made from coal tar?

  Mauveine
• Mauveine is made from?

  coal tar
• It is a brilliant blue color made from fermented leaves of plants?

  Indigo
• Indigo is obtained from a variety of plants, the most widely used one being the?


  Indigofera tinctoria
• It is extracted from lac?

  Red Lac Dye
• it is a resinous protective secretion of a tiny insect?

  Lac
• It comes from the scale insect Kerria lacca?


  Red Lac Dye
• It is a natural dye that gives a brown color?

  Iron Oxide
• Iron Oxide can develop different colors which are?

  yellow, red, brown and black
• Fe+3 = brown
• Fe+2 = red
• It is a dye derived from ferrous sulfate?

  Buff
• It's suitable substrates are polymides: nylon and proteins like wool, silk, and leather?

  Acid Dyes(Anionic Dyes)
• Acid Dyes are also known as?

  Anionic dyes
• Acid dyes carry a _______ charge?


  Negative
• It is applied in acidic conditions?

  Acid dyes