Give two reasons why people should use petrochemicals wisely.

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.

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?