Which statements are true? Check all that apply. Check all that apply. The higher the temperature, the more soluble most ionic solids are in water. As you cool a saturated solution from high temperature to low temperature, solids start to crystallize out of solution if you achieve a supersaturated solution. The higher the temperature, the more soluble most gases are in water. If you raise the temperature of a saturated solution, you can (usually) add more solute and make the solution even more concentrated.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.