Question

what do these two changes have in common?
baking cookies
deep - frying chicken
select all that apply.
both are only physical changes.
both are caused by heating.
both conserve mass.
both are chemical changes.

Explanation:

Step1: Analyze baking cookies

Baking cookies involves chemical reactions (e.g., Maillard reaction, starch gelatinization), so it is a chemical change. It uses heat and follows conservation of mass.

Step2: Analyze deep-frying chicken

Deep-frying chicken causes chemical changes (e.g., protein denaturation, browning reactions). It uses heat and follows conservation of mass.

Step3: Evaluate options

• "Both are only physical changes": Incorrect (both are chemical).
• "Both are caused by heating": Correct (both use heat).
• "Both conserve mass": Correct (law of conservation of mass applies to all changes).
• "Both are chemical changes": Correct (both produce new substances via reactions).

Answer:

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