Helium Gas diffuses through a space 3 times faster than an unknown gas. Use the graham's law equation to estimate the molecular mass of the unknown gas.

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal

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?