Endothermic Reaction
If the potential energy diagram shows that the energy of the reactants is lower than that of the products, the reaction will take in energy.…
Chemistry
Enthalpy Diagrams
Enthalpy diagrams are a representation of the relative internal energy of a system before and after a reaction. Horizontal lines are drawn to show the…
What is Enthalpy H in Thermodynamics
The heat absorbed or evolved by a reaction depends on the conditions under which it occurs, such as pressure. Thus instead of the term “heat”,…
Heat Energy and Chemical Reactions
Heat can be defined as the energy that flows into or out of a system because of a difference in temperature between the system and…
Energy and Chemical Reactions
All chemical reactions obey the First Law of Thermodynamics (also known as The Law of Conservation of Energy). This law states that the “Energy may…
Forms of Energy in Thermodynamics
Thermodynamics is the science of the relationship between heat and other forms of energy. Thermochemistry is the area of Thermodynamics related to the heat changes…
Electronegativity Value and Bonding
Electronegativity values are useful in predicting how electrons will be shared. Electronegativity is a measure of the attraction an atom involved in a covalent bond…
Ionisation Enthalpy
Ionisation enthalpy is the energy required to remove a mole of electrons from a mole of free gaseous atoms i.e. the energy required to remove…
Melting Points in Modern Periodic Table
The melting point starts off low, gradually increases to a peak (at group 14) then gradually decreases to a very low value (at group 0…
Density in Modern Periodic Table
The density of a substance is its mass per unit volume, usually measured in g cm. The graph below shows the variation in density (at…
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