Consider the unbalanced chemical equation below: CaSiO3(s) + HF(g) - CaF2(aq) + SiF4(q) + H20(1)
Suppose a 31.5 g sample of CaSiO3 reacted with 31.5 L of HF at 27.0 °C and 1.00 atm. Assuming the reaction goes to completion, calculate the mass (in grams)
of the SiF4 and H2O produced in the reaction.

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

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.

Compare and contrast physical changes with chemical changes.