The factor that affects how easily an electron can be removed from an atom is the

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?