From the options below, select the statement which best describes the concept of heat:

If a system does 45 J of work and receives 28 J of heat, what is the value of ΔU for this change?

Energy is measured in the units of:

For each of the symbols below, select the state function definition:

Using the Molecular Orbital diagram below, determine how many electrons need to be added to the CO molecule to give a resulting bond order of 2?

A diatomic molecule has 8 electrons in bonding molecular orbitals and 3 electrons in antibonding orbitals. What is its bond order?

What is the hybridization of the nitrogen atom in methyl nitrite (formula shown below)?

Which hybridization scheme leads to angles of 180° for its covalent bonds?

Diethyl ether (CH₃CH₂OCH₂CH₃) is a common laboratory solvent that was also used as an early anaesthetic. What is the hybridization of the O atom in diethyl ether, according to valance bond theory?