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CHM lab 1 and 3

CHM lab 1

QuestionAnswer
what form of iron is added to cereal? metallic iron
why cant the body absorb Fe^0 it isn't water soluble
what converts Fe^0 to Fe^2+ in the stomach? HCI
what gas forms when iron reacts with HCI? hydrogen gas
what color indicates a positive potassium ferricyanide test? deep blue
what does a negative ferricyanide test look like? yellow solution
why do you use a strong neodymium magnet? to pull iron fillings off stir bar into weigh boat
what is the purpose of the water control tube? to show what a negative test looks like
what is the purpose of the supplement control tube? confirms the test works with Fe^2+
name one major source of error during extraction? weigh boat not fully dry or iron washed away
what is the formula for density? density = mass divided by volume
what are the units for density of solids/liquids? g/mL
1 cm^3 equals how many mL? 1 mL
how do you convert mm to cm? move decimal one place to left
how do you find volume of coyote bone? water displacement
how do you find the volume of a metal cube? length x width x height
why must the bone be fully submerged? volume is underestimated
why must air bubbles be removed from the bone? air trapped lowers measured volumes
what is the meniscus? curved surface of the liquid
formula for specific gravity? density of liquid divided by density of water
density of water at room temp? 1 g/mL
normal urine specific gravity range? 1.005-1.020
what does high urine SG (greater than 1.020) indicate? dehydration or concentrated urine
what does low urine SG (less than 1.005) indicate? overhydration or kidney issues
as NaCl concentration increases, density_____? increases
Created by: Riley06
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