What are the concentrations of hydroxide and hydronium ions in a solution with a ph of 4.6?

1.3 × 10–4 m h3o+ and 7.7 × 10–11 m oh–

2.5 × 10–5 m h3o+ and 4.0 × 10–10 m oh–

7.9 × 10–6 m h3o+ and 1.3 × 10–9 m oh–

8.7 × 10–7 m h3o+ and 1.1 × 10–8 m oh–

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

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.

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins