Conservation of Mass
Method:
1)
2)
3)
4)
1)
Use pipettes to add the chemicals into separate test tubes.
Weigh them on the balance, record this.
Pour one test tube into the over, and mix carefully – use teacher method. Record any changes.
Reweigh the mass and record this. Calculate any difference in mass.
In each of the following equations identify the reactants and the products:
A.
Sodium Sulfate + Barium Chloride  Copper Sulfate + Ammonium
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B.
Copper Sulfate + Sodium Hydroxide  Copper Hydroxide + Sodium Sulfate
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C.
Copper Sulfate (s) + Water
 Copper Sulfate
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2)
Complete the table during the experiment:
Chemicals
Mass before (g)
Sodium Sulfate + Barium Chloride
Mass after (g)
Change in mass (g)
Copper Sulfate + Sodium Hydroxide
Copper Sulfate (s) + Water
3)
Briefly describe what happened in each reaction:
Sodium Sulfate + Barium Chloride: ________________________________________________________________
Copper Sulfate + Sodium Hydroxide: _______________________________________________________________
Copper Sulfate + Water: _______________________________________________________________
4)
Was there any significant change in mass? (This means a large change)______________________________
5)
Why was it necessary to measure all the test tubes after the reaction; even though one was
empty?_________________________________________________________________________________
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6)
How could this experiment be improved? _____________________________________________________
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7)
Make a summary about the mass of the reactants and the mass of products based on your results.
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8)
When might there be a large change to the mass of products compared to the mass of reactants?
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