4. Which elements would have similar properties to potassium? A. Lithium and Sodium
B. Bromine and Krypton
C. Calcium and Scandium
D. Cobalt and Rhodium

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

What is the percentage of hydrogen in nitrogen trihydride

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.