A earthquakes because the plates will suddenly shift quickly or gring quickly causing the ground to move because of the tectonic plates.
Answer:
Oxygen = 15.999 g/mol
Iron = 3 × 55.845 = 167.535 g/mol
CaCO3 = 20 × 100.0869 = 2001.738 g/mol
D) burning magnesium ribbon, as combustion is a chemical reaction so causes chemical change. The other 3 options do not involve reactions so there isn't a chemical change.
1.49 moles of Al will be produced. Hope this helps you.
