A 4.190 g sample of an oxide of chromium contains 2.179g of chromium, what is its empirical formula? a. CrO2
b. Cr2O
c. CrO3
d. Cr2O3

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.

Select the word from the list that best fits the definition the nuclear family into which a person is born or adopted.

Which terms are used to identify pure substances