Suppose a student performed the titration, but the solution never turned pink. check all the possible explanations. the student forgot to add phenolphthalein. the student added too much phenolphthalein. the student was not patient enough. the student used hcl as both the analyte and the titrant. the student used naoh as both the analyte and the titrant.

What are the primary responsibilities of a chemical engineer involved in "r& d"? develop large scale manufacturing operations discover new products and processes training of new chemists determine products needed by consumers

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.

What must occur for air masses to form fronts