Which of the following is represented in the highest percentage by volume in dry air?
a. hydrogen
b. nitrogen
c. oxygen
d. carbon dioxide?

14. many depressants reduce small muscle control, making it harder for a. you to steer b. your mind to consider complex problems c. the eye to scan, focus, or stay still d. the kidneys to filter alcohol out of the bloodstream

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

The kw for water at 0 °c is 0.12× 10–14 m2. calculate the ph of a neutral aqueous solution at 0 °c.