HELP PLZ HURRY Write the equilibrium constant expression for the following reactions.

1. N2(g) + 3H2(g) ⇆ 2NH3(g)

2. 2KClO3(s) ⇆ 2KCl(s) + 3O2(g)

3. 2NO(g) + Br2 (g )⇆ 2NOBr(g)

Explain how the integumentary system plays a crucial role in the ability to maintain homeoestasis

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

What are the similarities of physical and chemical change ?