Solids Liquids And Gases
Which property distinguishes a liquid from both a solid and a gas?
In the particle model of a solid, which statement correctly describes the arrangement and motion of the particles?
A student draws a diagram of gas particles with the same spacing as liquid particles. What is the error, and why is it incorrect?
Which statement correctly distinguishes boiling from evaporation?
A sealed syringe contains a fixed amount of gas at constant temperature. The plunger is pushed inward, increasing the pressure. What happens to the gas volume and the number of particles?
When a gas in a balloon is heated at constant pressure, the balloon expands. Which explanation is correct?
During freezing, which process occurs at the particle level?
A pure substance is heated steadily from solid to gas. On the heating curve, two horizontal (flat) sections are observed. What do these flat sections represent, and why does the temperature remain constant during them?
On a cooling curve for a pure substance, a student observes that one of the flat sections slopes slightly downward instead of being truly horizontal. What does this suggest?
A fixed mass of gas is kept in a container with a movable piston. The external pressure is doubled while the temperature is held constant. Using kinetic particle theory, which explanation correctly accounts for the change in volume?
Which pair of changes of state both involve a substance releasing energy?
A gas is trapped in a rigid, sealed metal container that cannot expand. The gas is heated. Which statement describes what happens?
A student states: “During boiling, the temperature rises because more energy is being added.” Identify and correct the error in this statement.
Why are gases easily compressed while solids and liquids are not?
A weather balloon is released at ground level and rises through the atmosphere where external pressure decreases. Assuming the temperature of the gas inside remains approximately constant, what happens to the balloon and why?
On a heating curve, a substance is heated steadily from −20 °C. The first flat section appears at 0 °C and the second flat section appears at 100 °C. Between 0 °C and 100 °C, the curve slopes upward. Which statement correctly describes what is happening in the sloped region between the two flat sections?
A student heats water in an open beaker. She notices bubbles forming throughout the liquid at 100 °C, and also notices that some water disappears from the beaker even when it is left at room temperature (25 °C). Which processes explain these two observations respectively?
A scientist compresses a gas in a sealed cylinder at constant temperature to one-third of its original volume. Using kinetic particle theory, which statement best explains why the pressure increases?