General Science - Physics (Basics)
Which of the following statements about physical and chemical changes is correct?
Which of the following statements about physical and chemical changes is correct?
hard Q9 of 15
Step-by-Step Solution
Step 1: Recall definitions
Physical changes alter form without new substances; chemical changes produce new substances.Step 2: Analyze each statement
Physical changes do not produce new substances; chemical changes do. Energy change is common in chemical changes, not always physical. Chemical changes are usually irreversible. Color change often occurs in chemical changes.Step 3: Eliminate incorrect options
Physical changes always involve energy change, chemical changes do not is wrong because physical changes usually do not involve energy change. Chemical changes are always reversible, physical changes are not is wrong as chemical changes are mostly irreversible. Chemical changes never involve color change is wrong as chemical changes often involve color change.Final Answer:
Physical changes do not produce new substances, chemical changes do → Option CQuick Check:
Physical vs chemical change = New substances formed only in chemical ✅
Quick Trick: New substance formation defines chemical change.
Common Mistakes:
- Misunderstanding energy and reversibility in changes.
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