Acobalt ion has a charge of 2. how many electrons does it have?

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

V1t2 = v2t1 is an expression of who’s law

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure