Is a strap of leather a pure substance

What is the percent by mass of carbon dioxide (CO2) in NaHCO3?

Calculate the pH of a solution prepared by dissolving 0.147 moles of acetic acid and 0.405 moles of sodium acetate in water sufficient to yield of solution. The Ka of acetic acid is 1.76*10-5

Dolphins communicate using compression waves (longitudinal waves). Some of the sounds dolphins make are outside the range of human hearing. Upon spotting a hungry shark, dolphin A sends a message to dolphin B.

The binding of oxygen to fe^{2+} in the first heme pushes the iron ion out of the porphyrin ring, decreasing the affinity for the second oxygen. True / False.

Rubidium is comprised of two isotopes, one of which has a natural abundance of 72% and contains 48 neutrons in the nucleus. given that the calculated atomic mass for rubidium is 85.

An acidic solution could have a pH of

Is ammonia acidic or alkaline?

How would you prepare 50.0 ml of 0.600 m hno3 from a stock solution of 4.00 m hno3? what volume (in ml) of the 4.00 m hno3 solution will you need?

Which volcanoes are located on a diverging boundaries

What is the chemical formula for the chemical reaction that occurs when a bath bomb is placed in water?