I like to put ice (c= 2.11 J/gC) in my coffee to cool it down. If the temperature of the ice I get out of my refrigerator is at 2°C and drop it into 100g of hot coffee at 80°C (c = 4.18 J/g°C).
How much ice would I need to use if I want the ending temperature to be 50°C?
*make sure to include the units on your answer

Amixture with the same composition throughout is!

How much would you need to weigh out in order to have 0.2moles of magnesium atoms?

When preparing a tlc slide of a reference standard material (rsm), a solvent or mixture of solvents is used to dissolve the rsm and transfer it into the tlc plate. how does its polarity affects the rf of the rsm? the rf will increase depending of it polarity, but never decrease it does not affects it since the solvent evaporates before the insertion of the tlc slide in the jar a polar solvent will definitively reduce the retention factor a polar solvent will increase rf