What is meant by "elastic collisions"?

heat given off by constant collisions,
compression of the gas,
resultant force of all combined collisions, or
collision and rebound without loss of energy

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

Which formula can be used to calculate the molar mass of hydrogen peroxide

For each of the following compounds, decide whether the compound's solubility in aqueous solution changes with ph. if the solubility does change, pick the ph at which you'd expect the highest solubility. you'll find ksp data in the aleks data tab. compounds does solubility change with ph