4. The molecules of a substance are in continuous motion. What type of path do they follow? Give one example.
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Explanation:
The molecule in substance are in Brownian motion. They usually follow zig- Zag path.
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Answer:
The particles in a substance are not at rest (in motion) , and they move randomly in all possible directions in a zig-zag path.
For example, the needle of the ECG machine makes zigzag motion on the graph sheet.
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