AP Chemistry Question of the Day --43

Welcome back to my blog. Here comes the answer to question 42 I posted earlier. The correct answer is D. 

Ionic compounds are mostly formed between a metal and a non metal. The only exception is ammonium salt where NH4 is a polyatomic ion. It has covalent bond inside the ammonium ion and the bond between ammonium and the anion is ionic.
D is the only compound that is not ionic.

Following is Question 43 of the series. 

43. Consider the following energy level diagram for a reaction that occurs in a single step. Which of the following statements is true? 

A The activation energy for the reverse reaction is less than zero. 
B Starting from reactants only, and before equilibrium is established, the rate of the forward reaction continually increases. 
C The effect of a temperature change on the rate is greater for the forward reaction than for the reverse reaction. 
D The activation energy for the forward reaction is less than that of the reverse reaction. 
E The enthalpy change for the forward reaction is less than zero. 

I will post the answer and explanation tomorrow. 

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