A balloon is filled with 10 L of air at a pressure of 1400 torr. What is the pressure of the balloon if the volume is changed to 5 L?

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

Which of the following is most likely true about water in chemical systems? a) water dissolves nonpolar ionic compounds. b) water dissociates ionic compounds. c) water dissociates covalent molecules. d) water dissolves nonpolar covalent substances.

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?