A flask holds five times as many moles of N2 as O2. If the total pressure in the jar is 18 atm, what is the pressure exerted by
oxygen?
atm

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

The tilt of the earth's axis of rotation is responsible for the a) ocean's tides. b) size of the moon. c) brightness of stars. d) earth’s seasons.

If two atoms are bonded to a central atom with no lone pairs,how will they be arranged