Fibers
What protein is wool made out of?
Keratin
What are the two monasaccharides that make up sucrose?
Glucose and fructose
What type of scales do bat hairs have?
Coronal
Does LDPE undergo addition or condensation polymerization?
Addition
Formula for RF?
distance the pigment (analyte) traveled/ distance the solvent traveled
What is a benefit of mercerization?
Strengthens the fiber (cotton typically)
What color is boric acid during a flame test?
Green
What is typically the medullary index of human hair?
Less than 0.33(1/3)
Do longer or shorter chains mean a polymer is more rigid/strong?
longer chains
What is the most common type of fingerprint?
Loops
What fiber is used for corduroy?
Cotton
What color does glucose turn after heating it up in benedict’s solution?
Red/brown orange
What are the three stages of hair growth in order?
anagen, catagen, telogen
Which plastic is used in styrofoam?
PS
3 steps of PCR?
Denaturing, Annealing, Elongation/Extension
Which fiber is stronger than steel wire?
Nylon
What type of iodine do we use for testing powders?
Lugol’s iodine
When a hair is pulled out, what parts must it have intact to pull DNA?
Root and Follicle
Why can thermoplastics be recycled and not thermosets?
Thermoplastics can be melted, softened, and reshaped due to weak IMFs, and thermosets have strong covalent bonds, so they can not be reshaped.
What is algor mortis?
The cooling of the body after death
Does HCl, NaClO, or acetone dissolve synthetic fibers?
HCl
Why do we use cobalt blue glass?
It absorbs yellow light to filter out sodium compounds.
What indicates whether a hair was from an alive or dead person?
Post-mortem root band
What is a plasticizer?
It can be added to a polymer to make it more flexible, leads to increased space between chains of polymer due to hydrophilicity of ester groups. (only need first part to get credit)
After months of decomposition of a body, what is usually the last insect left on the body?
beetles