a teacher wants to perform a classroom demonstration that illustrates both chemical and physical changes…
a teacher wants to perform a classroom demonstration that illustrates both chemical and physical changes. which would be the best demonstration that she could use? bending a piece of aluminum breaking a matchstick dissolving sugar in water burning a candle
Answer
Brief Explanations:
- Bending aluminum is a physical change as only shape changes, no new substance forms.
- Breaking a match - stick is a physical change, just a size and shape alteration.
- Dissolving sugar in water is a physical change as it's a mixture formation, no chemical reaction.
- Burning a candle involves both physical (wax melting) and chemical (wax reacting with oxygen to form carbon - dioxide and water) changes.
Answer:
burning a candle