You are on a field trip to a nearby lake for biology class and want to perform a quick analysis of the water’s approximate ph level. which ph measurement system would you use and why?

Phase changes are chemical changes. true or false

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not