Which one of the following to all methods of heat transfer require? a. A difference in thermal energy

b. A liquid or gaseous state

c. Direct physical contact

d. The movement of particles

Sugar is dissolved in water. which is the solute? sugar neither both water

Which statement explains why the bonds between non metals tend to be covalent? the bonds are found to be nondirectional they have large differences in electronegativity they have small differences in electronegativity they have ions that produce an electrostatic pull

Scientists are often interested in knowing the molar heat of combustion – the heat released during the combustion of one mole of a substance. use the periodic table to find molar masses. how many moles of ethanol are present in the sample?