Siti tried to push the plunger of a syringe filled with substance X. She found that she could push the plunger in slightly. What is substance X likely to be?
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Worked Solution
Step 1: Identify the observation (plunger can be pushed in).
Step 2: This means substance X can be compressed.
Step 3: Only gases can be compressed as they have no definite volume.
Step 4: Air is a gas.
Correct answer: Air
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