Until the late 1800s, which of the following sources was used to heat most homes?
fossil fuels
o electricity
biomass
solar energy

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?

Which wave is the result of amplification and produces a louder sound

In a particular chemical reaction, the energy of the reactants is 30 kj and the energy of the products is 5 kj. 
 the maximum energy of the system is 40 kj. sketch a potential energy diagram for this reaction. make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpy change for the reaction.