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Computer Engineering Electronics
Mathematics Physics
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In the lab we carried out the following chemical change. This is known as a chemical reaction:
Sodium Carbonate (aq) + Calcium Chloride (aq) ==> Calcium Carbonate (s) + Sodium Chloride (aq)
The above is a chemical equation for the reaction between Sodium Carbonate (aq) & Calcium Chloride (aq)
Note: the symbol (aq) means "aqueous" or "in a solution".
The chemicals in left side of the above equation are called the REACTANTS.
The chemicals in right side of the above equation are called the PRODUCTS.
We know this is a chemical change because:
A new substance was formed (a white solid precipitate -- called Sodium Carbonate)
Energy was being absorbed -- the bag felt cooler after the reaction
A colour change was produced from reactants to products
In the lab we took the mass of the chemicals before they were mixed (THE REACTANTS). Then we took the mass of the chemicals that formed after the mixing and we observed that:
Mass of Reactants (before reaction) = Mass of Products (after reaction)
The above statement is generally known as the LAW OF CONSERVATION OF MASS
Another important law that we will study is the LAW OF DEFINITE PROPORTIONS
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