Substance a will not dissolve in water. what can be said about substance a

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

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.