Powders
What powder fizzes in hydrochloric acid, Iodine, and water?
Alka Seltzer
What is the chemical formula of aluminum
Which liquid has the lowest ph
Vinegar
Name 3 synthetic fibers
nylon, polyester, spandex, rayon
What's the most common type of fingerprint?
loop
Which powder has a significantly lower pH than the rest?
Vitamin C
What metal is magnetic?
iron
The crime busters liquids are rubbing alcohol, hydrogen, vinegar, lemon juice, and water. Sort them into acid, base, and neutral.
rubbing alc- neutral
hydrogen- neutral
vinegar- acid
lemon juice- acid
water- neutral
ammonia- base
what is the thickest layer of a human hair?
cortex
Name 3 types of fingerprint minutiae
may vary
what are the two main uses for sodium acetate?
handwarmers, salt and vinegar chips
What 3 metals fizz in Hcl
zinc, magnesium, and aluminum
Which liquid has the highest ph
ammonia
Name the types of fibers and their burn test results
plant- slow burn, smells earthy and herbal
animal- smells horrible, large ball of ash, curls away from flame, self extinguishing
synthetic- melts, curls away from flame, self extinguishing
What is one step of PCR?
denaturation, annealing, elongation
Name 7 edible powders
Flour, baking soda, salt, cornstarch, yeast, gelatin, sugar, sodium acetate
What is one explosive use of magnesium?
gunpowder, fireworks
Which liquid should never be mixed with bleach?
ammonia
what protein is hair made up of?
keratin
what is the recycling code for PMMA?
7
A mixture contains some irregular crystals, fizzes in HCl, turns black in iodine, is partly soluble and soupy in water, and is a uniform white color. Which mixture of 3 powders is it? (hint: one of the powders is not sodium bicarbonate)
sugar, calcium carbonate, and cornstarch
What is the only crime busters metal that can not be found in our body naturally?
aluminum
What is the difference between an acidic and basic liquid?
Acids add hydrogen ions while bases contribute hydroxide ions to a solution
What cuticle shape does cat hair have? (spinous, imbricate, or coronal)
spinous
What is Locard's exchange principle?
Something is always taken and left behind at a crime scene