equation is similar to a recipe. It states the ingredients (reactants) and
the proportion of each ingredient used. It also gives the amount of product
formed. Look at the animation below.
View the animation above as a movie
1) What does the Law of Conservation of Mass state?
2) A balanced chemical equation does not show
3) What must be the same on each side of a balanced chemical equation?
4) Consider the equation below.
Ethene burns in oxygen to produce carbon dioxide and water
according to the equation below.
C2H4(g) + 3O2(g) => 2CO2(g) + 2H2O(l)
a) How many carbon atoms are on the left of the equation?
b) Does this equation obey the Law of Conservation of Mass?
d) Each molecule of ethene has
carbon atoms and
atoms of hydrogen.
e) Each molecule of oxygen is made of
atoms of oxygen
molecule of ethene reacts with
molecules of oxygen to form
molecules of carbon dioxide and
g) The water formed is in the
h) For every one molecule of
ethene that reacts
molecules of water form.
i) If 6 molecules of oxygen react, how many molecules of carbon dioxide will form?