Where energy store at the end in a lighting candle

Two things that biomedical has invented or innovated

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

If i can still dissolve more sugar into the solution at a certain temperature what would i call that solution