At constant temperature and volume x decomposes as 2x (g)-3y(g)+2z(g)px is the partial pressure of x. Observation :1,2,3and time(min)0,100,200and px(in mm of Hg):800,400,200.i)What is the order of the reaction with respect to x? ii)Find the rate constant
iii)Find the total pressure when pressure of x is 700mmHg.

Yes, endothermic means it turns cold. and some chemical changes include change of tempature.

B"hf and f-"  is the correct answer took the test on edgenuity and got it right     

Answerthis solution will not form a precipitateexplanationsolubility equilbrium:         pbf₂(s)  ⇄ pb²⁺(aq) + 2 f⁻(aq)the solubility product expression is    (we exclude solids from the equilibrium expression).now suppose we have the trial ion product q, which we can define as    then, we can interpret  q as the product of the concentration of the ions that we have and ksp as the product of the ion concentrations that are needed to form a saturated solution.if q > ksp, then that implies that there will be a surplus of ions that exceed the amount that is required to form a saturated solution. a precipitate will then form (the precipitate continually  forms until the surplus ions are removed and q is decreased to ksp's value).if q = ksp, the saturated solution that forms is barely saturated and the precipitate will be minimal.if q < ksp, then the ion concentration will not be enough to form a saturated solution (so no precipitate).using our information, we calculate the trial ion product:     since q = 2.7  × 10⁻⁸ < ksp =  4  ×  10⁻⁸, a precipitate will not form.