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Questions and Answers
What will be the final mass if a solid initially weighs 100 g and loses 25 g?
What will be the final mass if a solid initially weighs 100 g and loses 25 g?
- 125 g
- 100 g
- 75 g (correct)
- 50 g
How is the percentage gain calculated when the initial mass is 36 g and the final mass is 84 g?
How is the percentage gain calculated when the initial mass is 36 g and the final mass is 84 g?
- 50.0%
- 133.3% (correct)
- 66.7%
- 233.3%
If heating calcium carbonate results in a 44% mass loss from an initial mass of 100 g, what is the remaining mass of the solid?
If heating calcium carbonate results in a 44% mass loss from an initial mass of 100 g, what is the remaining mass of the solid?
- 44 g
- 56 g (correct)
- 100 g
- 66 g
What is the mass of zinc formed if a 4.0 g piece of zinc increases in mass by 20% after heating?
What is the mass of zinc formed if a 4.0 g piece of zinc increases in mass by 20% after heating?
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What is the percentage change in mass if 12.4 g of copper carbonate produces 4.4 g of copper oxide?
What is the percentage change in mass if 12.4 g of copper carbonate produces 4.4 g of copper oxide?
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Study Notes
Calculating Mass Changes
- Final mass is always less than initial mass if the solid loses mass.
- Percentage gain: (\frac{\text{mass change}}{\text{initial mass}} \times 100)
- Percentage loss: (\frac{\text{mass change}}{\text{initial mass}} \times 100)
Example of Percentage Change in Mass
- When copper carbonate is heated it decomposes into copper oxide and carbon dioxide.
- The mass change is calculated by subtracting the final mass from the initial mass.
- Percentage change is calculated using the formula: (\frac{mass change}{initial mass} \times 100).
Additional Problems & Learning Objectives
- Students can calculate percentage gain and loss as well as percentage change,
- Express one number as a percentage of another.
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