1) H2(g)+I2(g)⇌2HI(g). Why does the reaction occur only in the forward direction at first?
2) During the reaction, how does the rate of the forward direction compare to the rate of the reverse direction?

The reaction has a low activation energy and mostly of the reactants are converted into products hence the reaction tends to occur in the forward direction2) The rate of the reverse reaction is too small compared to  the rate of the forward reaction.What is the reaction?The term reaction has to do with the interaction that occurs between the reactants and the products. Thus as the reactants interacts, a new substance is formed and then we have new substances and they are called  the products. Looking at the reaction as it is written in question (1), we can see that the there is a complete and total interaction that occurs as all the reactants are converted into products. Given the fact that all the reactants are converted into products, the reactions can only proceed forward.In this reaction, we can see from the equation that the reaction is reversible. This means that the reaction is able to occur in both directions; forward and backwards. This reactions proceeds mostly forward hence the rate of reverse reaction is infinitesimal compared to the rate of the forward reaction.Learn more about reaction:https://brainly.com/question/28984750#SPJ1