Bio fuel is a mixture of petrol and 20%——————

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

Compare and contrast physical changes with chemical changes.

Stage in which a typical star has completely stopped fusion