The automatic switch found in a electric kettle is consideres an energy saving device. jow does the automatic switch saves energy?

Which real-world scenarios below represent physical and chemical changes? -running a car -exploding fireworks -mixing water and powdered drink mix -combining oil and vinegar to make salad dressing -taking aspirin for a headache -diluting bleach with water-digesting dinner-spreading peanut butter on bread

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Areaction in which products can react to re-form reactants is