Aplastic cup is filled with 15.5 grams of water. the cup is sealed and placed in the freezer. the water freezes and turns to ice. the next day, the ice is taken out of the cup and massed. what is the mass of the ice?
a) 15.0 grams
b) 15.4 grams
c) 15.5 grams
d) 20.5 grams

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude