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Updated: 5/16/2020
Unknown Story
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  • Hi my name is Ella. I am the new girl in class. I have some queries regarding the chemistry topic taught yesterday in class. Do you mind helping me out?
  • Sure, we would love to help! By the way I am Hazel.And these are my friends Ruby and Tamara.
  • The number of atoms on both the sides needs to be equal.
  • So, whenever we balance a chemical equation always remember to satisfy the law of conservation of mass.
  • It is only when this is satisfied that an equation is called balanced chemical equation.Look ahead it is just like we play tug-of war wherein the number of people on both sides needs to be equal otherwise the game will not be fair.
  • The physical state of the reactants and the products could be mentioned in the equation. (aq) can be used to represent an aqueous solution. If a gas is released it could be shown by putting an arrow in upward direction.
  • Oh, I never thought about it that way. It is interesting. What about making it more informative?
  • Also,if a precipitate is formed it is indicated using an arrow in the downward direction. Reversible reactions can be indicated using a double headed arrow.The actual concentrations of the reactants cannot be mentioned so we could use con: or dil: to represent the same.
  • And finally, in an equation the temperature and pressure if the substance could be shown above or below the arrow. Exothermic reactions could be represented using a + heat sign on the products side and if it is endothermic then + heat on the reactants side or – heat on the products side.
  • Thank you so much all of you, it was very helpful. Do you want to play a game of tug-of- war?
  • Sure!
  • Let's go!
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