Calcium oxide or quicklime (cao) is used in steelmaking, cement manufacture, and pollution control. it is prepared by the thermal decomposition of calcium carbonate: caco3(s) → cao(s) + co2(g) calculate the yearly release of co2 (in kg) to the atmosphere if the annual production of cao in the united states is 2.1 × 10^10 kg.

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.