The northern lights and huge power surges in technology are both effects of what

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

What is the number of moles in 15.0 g ash3?

Which fact represents evidence for the big bang theory?