Introduction to balanced chemical equations.
A chemical 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.

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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?
c) Why
d) Each molecule of ethene has carbon atoms and atoms of hydrogen.
e) Each molecule of oxygen is made of atoms of oxygen
f) molecule of ethene reacts with molecules of oxygen to form molecules of carbon dioxide and of water.
g) The water formed is in the state.
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?


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