Which statements describe the jim crow laws of the post-civil war period?

choose all answers that are correct.

they reflected white southerners hostility towards former slaves.

they made segregation illegal throughout the south.

they set up a "separate but equal" system for public facilities.

they were used to deny blacks their civil rights as american citizens.

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.

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa

Which is the most concentratic acid