Which of these is a ball and stick model? C subscript 2 H subscript 4.

2 overlapping large black spheres each with 2 small blue spheres overlapping it.

2 medium sized black spheres connected by 2 grey sticks. Each black sphere has 2 small blue spheres connected to it by 1 grey stick.

2 C's connected by 2 black lines. Each C has 2 H's connected to it each by 1 black line.

Which substances have the lowest melting points: ionic covalent, or metallic

Ammonia and oxygen react to form nitrogen monoxide and water, like this: 4nh3 (g) + 5o2 (g) → 4no (g) + 6h2o (g) also, a chemist finds that at a certain temperature the equilibrium mixture of ammonia, oxygen, nitrogen monoxide, and water has the following composition: compound pressure at equilibrium nh3 65.1atm o2 31.3atm no 62.7atm h2o 65.8atm compound pressure at equilibrium nh3 65.3 atm o2 7.79 atm no 12.1 atm h2o 65.8 atm calculate the value of the equilibrium constant kp for this reaction. round your answer to 2 significant

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