30. Which of the following crystal structures has two 90° axis angles and one angle = 90°? a. cubic
c. monoclinic
b. hexogonal
d. triclinic

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

Consider this equilibrium: n29) + o2(g) + 2no(c).nitrogen gas and oxygen gas react when placed in a closed container. as the reaction proceeds towards equilibrium, what happens to the rate of thereverse reaction?