]The table below shows the approximate declination of four stars. Name of star Declination Hadar -60° Rigel -8° Pollux +28° Regulus +11° Which of these stars are located below the celestial equator? Hadar and Rigel Pollux and Regulus Hadar and Regulus Rigel and Pollux

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.

What two categories of toxins were present in the air at dish, texas as a result of the gas pipelines that pass through the area