The picture below shows a train as it approaches a hill. This train can only make it over the hill if it approaches at it's top speed because it will
lose speed as it climbs. What changes are taking place in the train's
potential and kinetic energy as it climbs the hill?

Answerionic bond imfs are stronger than covalent;

Aquantity of that isotope to decay to 1/2 of  its original value

  the volume of  0.220 m k2s    solution  required  to  completely  react with 175 ml  of 0.115m co(no3)2  calculate the moles  of co(no3)2 =  molarity x volume/1000175 x0.115/1000= 0.02  moleswrite  the reacting  equationk2s(aq)  +  co(no3)2  = 2 kno3(aq)  + cos(s)by  use  of mole ratio between k2s to co(no3)2 which  is  1: 1 the moles of k2s is therefore = 175  x0.115/1000= 0.02  molesvolume = moles/molarity=0.02/0.22=0.09  ml  of k2s