Substance Z melts at 15 °C and boils at 110 °C at 1 atm. Two separate samples of Z are examined:
• Sample A is held at 80 °C; its particles are in close contact but slide past one another, continually colliding.
• Sample B is held at 140 °C; its particles are widely separated, moving in straight lines between brief collisions and filling the entire container.
Which identification of the physical state of each sample is most accurate?
a) Sample A is a liquid and Sample B is a liquid.
b) Sample A is a liquid and Sample B is a gas.
c) Sample A is a gas and Sample B is a liquid.
d) Sample A is a solid and Sample B is a gas.