8. (04.03 LC) Which of the following steps can be used to identify a double replacement reaction? (5 points)
Check if the ions of two compounds exchange places.
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Check whether the products are salt and water.
Check if one element replaces another element in a compound.
Check whether the reactants are an acid and a base.

What must happen before a body cell can begin mitotic cell division

Name the element in group 17, period 2. (periodic table)

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.