The respiratory rate for a person is about 20 breaths per minute. Assume that each average breath is about 300 cm3 of air at 20oC and 9.95 x 104 Pa. What volume of air in cm3, corrected to STP, does the individual breathe in one day

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt