\begin{tabular}{|l|l|} \hline Reaction Equation & $\Delta H ( K J / M O L )$ \\ \hline Reaction 1:- $Mg ( S )+2 HCl ( Aq ) \rightarrow MgCl _2( Aq )+ H _2(g)$ & -450 \\ \hline Reaction 2: $MgO ( S )+2 HCl ( Aq ) \rightarrow MgCl _2( Aq )+ H _2 O ( L )$

Begin, commence, start, initiate, inaugurate, usher in mean to take the first step in a course, process, or operation. Begin, start, and commence are often interchangeable. We can use the verbs begin and start to mean the same thing but begin is more formal than start.

Begin is an irregular verb. Used with noun phrases if you start or begin something, you do it from a particular time. Begin, commence, initiate, start (when followed by noun or gerund) refer to setting into motion or progress something that continues for some time.

Begin is the common term: To begin to do something means to start doing it. When you begin something, you go ahead with its first part or stage — you can begin the day with a good attitude, or begin a very long book over and over again, always falling asleep before you get to.

See examples of begin used in a sentence. Begin meaning, definition, what is begin: Master the word "begin" in english: