Question

what do these two changes have in common? sauce burning on a stove firing a clay pot in a hot kiln select all that apply. both are chemical changes. both conserve mass. both are caused by cooling. both are caused by heating. submit work it out

Explanation:

1. Analyze "sauce burning on a stove": Burning involves a chemical reaction (oxidation), is caused by heating (stove provides heat), and mass is conserved (Law of Conservation of Mass).
2. Analyze "firing a clay pot in a hot kiln": Firing causes chemical changes in clay (like dehydration, mineral changes), is caused by heating (kiln heat), and mass is conserved.
3. Evaluate options:

• "Both are chemical changes": Correct, as both involve chemical reactions.
• "Both conserve mass": Correct, due to the Law of Conservation of Mass in chemical changes.
• "Both are caused by cooling": Incorrect, both are heated, not cooled.
• "Both are caused by heating": Correct, stove and kiln provide heat.

Answer:

A. Both are chemical changes.
B. Both conserve mass.
D. Both are caused by heating.