2 H20 --> 2 H2 + O2 How many grams of H2O are needed to produce 55.7 moles of H2?

Which of the following compounds does not contain molecules? question 2 options: co2 h2 nacl h2o

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

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.