Consider this reaction: zn(s) + 2hcl(aq) zncl2(aq) + h2(g). which change could decrease the rate of production of zncl2?

Consider this reaction: Zn(s) + 2HCl(aq) ZnCl2(aq) + H2(g). Which change could decrease the rate of production of ZnCl2?
The answer is: increasing the [HCl] 

This is supported by the "Le Chatelier's Principle" that states, "If a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium moves to counteract the change."
Increasing the temperature of a system in dynamic equilibrium favours the endothermic reaction. The system counteracts the change you have made by absorbing the extra heat.Decreasing the temperature of a system in dynamic equilibrium favours the exothermic reaction. The system counteracts the change you have made by producing more heat.

Any photo? or something

Ch4 is nonpolar and insoluble in water. since all of the hydrogen atoms are evenly spread around the carbon atom even through the c h bond is polar all the poles cancel each other out.