8. An ionised sample contained the ions 23Nat which had a time of flight of 1.134 x 105 s and an unknown element X whose ions had a time of flight of 1.689 x 10-5 s. Find the Ar of the unknown
element.
In
(4)

An alkaline battery produces electrical energy according to the following equation. zn(s) + 2 mno2(s) + h2o(l) zn(oh)2(s) + mn2o3(s) (a) determine the limiting reactant if 17.5 g zn and 31.0 g mno2 are used. (type your answer using the format ch4 for ch4.) (b) determine the mass of zn(oh)2 produced. _ g

Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.

Avariable that is not being directly tested during an experiment should be