In which situation will the friction between an object and the surface on which
it is moving be increased?
(1 point)
a. the object is pushed over a longer distance.
b. the weight of the moving object is decreased.
c. the object is pushed with greater force against the surface.
d. the surface on which the object is moving is made smoother.

You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices