Why are polar bears listed as a threatened species?

Suppose that you take the spectra of several stars to identify the 434-nm line of hydrogen (color = indigo), but you find the lines are shifted due to the Doppler effect.

How many grams of nacl will be needed to form 600ml of s saturated solution at 100°c

Estimate the ph of the resulting solution prepared by mixing 1.0 mole of solid disodium phosphate (na2hpo4) and 1.25 mole of hydrochloric acid. The pka values for phosphoric acid are 2.1, 7.2 and 12.4.

1. Why does CH30 evaporate faster than water?

A solution of rubbing alcohol is 75.7 % (v/v) isopropanol in water. How many milliliters of isopropanol are in a 87.7 mL sample of the rubbing alcohol solution?

How much ice at a temperature of - 17.5 ∘C must be dropped into the water so that the final temperature of the system will be 31.0 ∘C?

Why does a gas fill completely the vessel in which it is kept?

Individuals who work full time and those who work part-time enjoy basically the same number of paid leave benefits. True False

There is a large increase in ionization energy between the second and the third ionization energies of a metal. What kind of ion is the metal likely to form? Include the charge in your answer.

Which of the following are true statements about equilibrium systems? For the following reaction at equilibrium: CaCO3 (s) ⇌ CaO (s) + CO2 (g) adding more CaCO3 will shift the equilibrium to the right.