A) balance the following equations:
i) pbcl2 + agno3 < > agcl + pb (no3) 2
ii) alcl3 + nh4oh < > al(oh)3 + nh4cl
iii) fecl3 + ca(oh)2 < > cacl2 + fe(oh)3
iv) pb(clo3)2 + k2so4 < > pbso4 + kclo3
v) na + hoh < > naoh + h2
vi) zn + hcl < > zncl2 + h2
vii) al + agch3coo < > al(ch3coo)3 + ag
viii) mgo + hno3 < > mg (no3)2 + h2o
ix) mno2 < > mn3o4 + o2
b) why is it incorrect to alter the chemical formula when balancing an equation?

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa

Akno3 solution containing 51 g of kno3 per 100.0 g of water is cooled from 40 ∘c to 0 ∘c. what will happen during cooling?