Two changes are described below. A. Ice melts to form water. B. Sugar cubes dissolve in hot coffee. Which statement is true about thw two changes? A. Both are chemical changes because there is a chage in the composition of ice and sugar.
B. Both are physical changes because there is a change in the physical states of ice and sugar.
C. A is a physical change due to a change of state, but B is a chemical change becaue new molecules are formed.
D. A chemical chage due to a change of state, but B is a physical change because new molecules are formed.

Air pressure is measured in pascals. for a professional american football game, the ball should be inflated to about 90,000 pascals. scientists studied the effects of air temperature on the pressure inside american footballs by taking these steps: 1. prepare 100 footballs. 2. measure each football's air pressure. 3. divide footballs into 10 groups. 4. place the groups in different lockers cooled to different air temperatures. 5. after 12 hours, remove the footballs from lockers. 6. measure each football's pressure again. 7. compare the new pressures to the starting pressures. what two terms best describe the variable "air pressure inside the football" in this experiment? independent, qualitative independent, quantitative dependent, qualitative dependent, quantitative