2. Given the balanced equation representing a reaction:
Zn(s) + 2HCl(aq) - H2(g) + ZnCl2(aq)
Which set of reaction conditions produces Helg) at the fastest rate?
a. a 1.0-9 lump of Zn(s) in 50 mL of 0.5 M HCl(aq) at 20."
b. a 1.0-g lump of Zn(s) in 50 ml of 0.5 M HClag) at 30.C
c. 1.0 g of powdered Zn(s) in 50. mL of 1.0 M HCl(aq) at 20.00
d. 1.0 g of powdered Zn(s) in 50. ml of 1.0 M HClag) at 30.C

Complete the following reactions using word and balanced equations including states. dilute phosphoric acid is added with a calcium hydroxide solution.

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.

If you add 10ml of hot water to 10ml of cold water and the change in tempature 8°c calculate how much energy is gained by the cold water