if there is the same number of atoms on both sides
e.g
Mg + HcI-------------> Mg + HcI^2 (HcI squared)
this is an unbalanced reaction because there is more chlorine on the right side than the left side.
so when you balance the equation it will look like this:
MG + HcI^2------------------>Mg +HcI^2
The reaction is exothermic.
You are the only person who can tell YOUR reaction.
You need to calculate the yield of the reaction.
You can generally tell by changes in temperature, whether you have an exothermic reaction which produces heat, or an endothermic reaction which consumes heat.
How the concentration of the reactants affects the rate of a reaction
reaction
yes
How fast a reaction is going
well you can tell by her reaction when you hug her and the way she looks at you
If his answer has alot of physical reaction.
Equillibrium in a reaction has occured when the concentration of compounds remain unchanged.
Only after the measurement of the reaction rate. See the link below for details.