My notes when dissolved in water, ammonium cyanate, nh4cno, isomerizes to urea, h2nconh2, in the following reaction. nh4cno(aq) → h2nconh2(aq) in this second-order reaction, the rate constant, k, is equal to 0.0597 l/mol·min. from an initial concentration of 0.175 m ammonium cyanate, calculate the concentration of ammonium cyanate after the reaction has progressed for 47.8 minutes. the integrated form of the second-order rate law is 1 [a]t = kt + 1 [a]0 , where [a]t is the concentration of reactant a at time t, k is the rate constant, and [a]o is the initial concentration of reactant a.

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

The fact that the total amount of energy in a system remains constant is a(n)