Which operations are not associative?
a.
multiplication and addition
b.
multiplication and division
c.
division and subtraction
d.
addition and subtraction

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system