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Question 1
2 pts
Which of the following is true of a chemical reaction?
(Al Only physical changes occur.
[B] New substances must form.
IC Only changes of state occur.
[DJ Chemical properties remain the same.
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
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