According to the Bronsted Lowery definition, a base is a a substance that increases the hydroxide ion concentration in water b a substance that can accept a proton from an acid c a substance that can donated an electron pair to the formation of a covalent bond. d a substance tha increases the anion formed by the autoionization of the solven t e none of these

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

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.

Suppose that during that icy hot lab 65,000 j of energy were transferred to 450 g of water at 20°c what would have have been the final temperature of the water