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Questions and Answers
What is the indication of a chemical change?
What is the indication of a chemical change?
- Change in the nature and identity of the initial substance (correct)
- Change in temperature only
- Change in physical state
- Change in weight only
What is the outcome of burning a magnesium ribbon?
What is the outcome of burning a magnesium ribbon?
- Change in color to black
- Formation of ash (correct)
- No change observed
- Release of a foul odor
What is the purpose of cleaning the magnesium ribbon with sandpaper?
What is the purpose of cleaning the magnesium ribbon with sandpaper?
- To change the color of the ribbon
- To prevent the ribbon from burning
- To remove impurities and ensure better burning (correct)
- To soften the ribbon for burning
What is the significance of collecting the ash formed after burning the magnesium ribbon?
What is the significance of collecting the ash formed after burning the magnesium ribbon?
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How can we determine if a chemical reaction has taken place?
How can we determine if a chemical reaction has taken place?
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