People who can digest lactose, a disaccharide, have enzymes, called lactase, to break the molecule
down into glucose and galactose, two monosaccharides. People who are lactose intolerant cannot
properly break down lactose because their body does not make enough lactase.
Which of the following describes the process of digesting lactose?
It is an anabolic process with an exergonic reaction that results in the release of energy.
It is a catabolic process with an exergonic reaction that results in the release of energy.
It is an anabolic process with an endergonic reaction that requires an input of energy.
It is a catabolic process with an exergonic reaction that requires an input of energy.

Different isotopes indicate that an element will have different numbers of

If the density of water is 1.0 g/cm3, which of these materials would float in water, based on their densities? check all that apply. aluminum cork iron lead wax

Straightforward questions answered in the powerpoint slidesreaction: heating the starting materials under refluxwhat does it mean to heat under reflux? why do we choose water as the reflux solvent? what are boiling chips used for? why do we put a condenser on top of the reaction? why do we add heat and let the reaction stir for 30 minutes? why do we add sulfuric acid to the reaction after it cools as opposed to when it’s still hot? separation: filtration of precipitatewhy don’t we do an aqueous and organic extraction in the separatory funnel? why do you rinse the salicylic acid on the filter with ice cold water? purification: recrystallization of salicylic acid (no hot filtration needed)what is the difference in the amount of room temperature water vs. boiling water needed to dissolve the salicylic acid (assume a 1.2 gram yield of salicylic acid)? remember, in the lab if you need x ml of boiling water to dissolve a solid, then you should add a little more (definitely no more than 1.5 times the theoretical amount) to ensure it doesn’t recrystallize prematurely.analysis: melting point of salicylic acidwhat can you conclude if the melting point of the salicylic acid you just synthesized is 152-155oc and the 1: 1 mix of your product and “synthetic” salicylic acid is 151-154oc?