A candle burns: wax melts, then the wick burns. Which is true?
ABoth are physical changes
BMelting is physical, burning chemical
CBoth are chemical changes
DMelting is chemical, burning physical
Answer & Solution
Correct answer: B. Melting is physical, burning chemical
Melting wax keeps the same substance, whereas burning forms new substances such as carbon dioxide and water vapour.
Keep practising Physical and chemical changes
Browse all Physical and chemical changes questions for Olympiad (Class 7), or explore more Science topics.
Related questions
A change in colour during a process most reliably suggestsCopper turns green after long exposure to damp air. This shows copper hasWhich pair correctly matches the change with its type?Baking soda is added to vinegar and bubbles of gas appear. This showsWhich of these is a physical change?A chemical reaction changes the atoms of a substance byRusting is specifically the corrosion of which metal?Stainless steel resists rusting because it forms a thin layer of