Two iron oxide samples are given to you where one is red and the other is black. you perform a chemical analysis and you find that the red sample has a fe/o mass ratio of 2.327 and the black has a fe/o mass ratio of 3.491. you suspect the red sample is simple rust or fe2o3. what is the chemical formula for the black sample?

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland

Phosphorous acid, h3po3(aq) , is a diprotic oxyacid that is an important compound in industry and agriculture. p k a1 p k a2 1.30 6.70 calculate the ph for each of the points in the titration of 50.0 ml of 1.5 m h3po3(aq) 1.5 m h 3 po 3 ( aq ) with 1.5 m koh(aq). 1.5 m koh ( aq ) .

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.