They represent elements by using symbols
Answer: Potassium perchlorate
Explanation:
Conduct experiments to see which hall Bounce the higher and see how they could collect data
That would be 0.5 g/ml because Density is equal to mass divided by volume and 8.5 is half of 17.
Dissolving a solid in liquid is a physical change . For eg table salt in water is a physical change because only the state of the matter has changed. Allowing the water to evaporate will return the salt to a solid state. Thus, dissolving a solid is a physical change.