Which of the following is not true about sedimentary rocks?

a.
they are formed through compaction and cementation.
c.
they are formed from igneous rock fragments.
b.
they are made up of sediments.
d.
they are not part of the rock cycle.

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Nitrogen dioxide decomposes according to the reaction 2 no2(g) ⇌ 2 no(g) + o2(g) where kp = 4.48 × 10−13 at a certain temperature. if 0.70 atm of no2 is added to a container and allowed to come to equilibrium, what are the equilibrium partial pressures of no(g) and o2(g)