Which statement is not true about an astronomical unit?

a)
they au is the distance from the center of the earth to the center of the sun

b)
an au increased by 3 million miles every 15 years.

c)
an au is approximately 93 million miles.

d)
an au is equal to 0.1581 light years

Answer explain why it is not possible to deduce a complete order of reactivity.

Chlorine and water react to form hydrogen chloride and oxygen, like this: 2cl2 (g) + 2h2o (g) → 4hcl (g) + o2 (g) also, a chemist finds that at a certain temperature the equilibrium mixture of chlorine, water, hydrogen chloride, and oxygen has the following composition: compound concentration at equilibrium cl2 0.55m h2o 0.57m hcl 0.53m o2 0.34m calculate the value of the equilibrium constant kc for this reaction. round your answer to 2 significant digits.

In a ball-and-stick molecular model, what do the sticks represent?