20mL of hydrogen measured at 15.0°C is heated to 35°C. What is the new volume at the same preasure?​

What is the independent variable in this investigation? mass volume sample number substance density

If 3 moles of a compound use 24 j of energy in a reaction, what is the a hreaction in j/mol?

Astring vibrates with a frequency of 10 hz. why can't a person hear the sound waves produced by the vibrating string, no matter how large the amplitude of the waves? out! this is homework and due tomorrow! you so much!