Question

Given the equation representing a system at equilibrium: kno3 s + energy which change causes the equilibrium to shift?

Answer 1

Missing question:
KNO₃(s) + energy ⇄ K⁺(aq) + NO₃⁻(aq)
Which change causes the equilibrium to shift?
(1) increasing pressure .
(2) increasing temperature. 
(3) adding a noble gas. 
(4) adding a catalyst.

Answer is: (2) increasing temperature. 

This is endothermic reaction, because heat is included as reactant.
According to Le Chatelier's Principle, the position of equilibrium moves to counteract the change, because heat (temperature) is increased, system consume that heat, so equilibrium is shifted to right, by decreasing concentration of reactants and increasing concentration of product.