An Exothermic reaction releases energy into the surroundings and so the products have more potential energy then the reactants. The enthalpy change is a negative value. Whereas, an endothermic reaction involves the absorption of energy into the system and so the reactants have more potential energy than the products. The enthalpy change is a positive value. This is clearly represented in energy profile diagrams.
False it is made up of protons and neutrons not electrons!!
As you go down group 7 the melting point of the elements will increase, this is because as you go down the group you are gaining an electron shell and the molecule will become bigger. This increase in size means that there will be an increase in the intermolecular forces as well.
So the order would be NF3, NBr3, NI3.
Hopefully this helps!
Everywhere
Hope that helps and good luck
~May
I think the correct answer from the choices listed above is option 3. In the reaction 2NaCl + 2H2O ? 2NaOH + Cl2 + H2, the reactants should <span>weigh the same as the products. This is to agree with the law of conservation of mass where mass in should be equal to mass out.</span>
