Why does the water cycle happen fast in some places and slowly in other places ?

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 overall order of reaction for rate = k[no]2[o2]

Modern weaponry has increased the number of deaths in wars and violent conflicts.