Do you understand the Law of Conservation of Mass?
Conservation of Mass Quiz
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Question 1 of 6Question 1
The mass before reactions is the same as after reactions, this is known as the Law of ……
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Question 2 of 6Question 2
Closed, non-enclosed, neutralisation, precipitation, equal, non-equal
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Complete the statement describing a chemical reaction:
Potassium iodide solution and lead nitrate solution react in a closed flask to form a yellow precipitate of lead iodide and a colourless solution of potassium nitrate. This is a reaction and since it occurs in a closed flask it is an example of a system. The mass of the reactants and products will be .
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Question 3 of 6Question 3
In non-enclosed systems, the mass of the products may be lower than the reactants. This does not violate the Law of Conservation of Mass. Why is this the case?
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Question 4 of 6Question 4
In non-enclosed systems, the mass of the products may be higher than the reactants. This does not violate the Law of Conservation of Mass. Why is this the case?
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Question 5 of 6Question 5
Calculate the mass of fluorine needed to make 100g of magnesium fluoride. Consult the periodic table for all of the information you will need. Answer to one decimal place.
The balanced chemical equation for this reaction is:
F₂ + Mg → MgF₂
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g
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Question 6 of 6Question 6
Calculate the mass of oxygen needed to react with 20g of hydrogen to make water.
The balanced chemical equation for this reaction is:
2H₂ + O₂ → 2H₂O
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g
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