please help! What mass of methane (CH4) must be burned to produce 4000KJ of heat? Heat of combustion of methane = -891 KJ/mol.

Which common material is an example of a polymer? (25 pts) a. steel b. plastic c. petroleum d. rubbing alcohol

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?

Many pharmaceutical drugs are organic compounds that were originally synthesized in the laboratory. which two scientific disciplines are bridged by pharmaceutical drugs? chemistry and forensics chemistry and medicine biology and forensics biology and criminology