Unit 8 States of Matter & Intermolecular Forces

What is the significance of Avogadro's Law?

• It states that equal volumes of gases, at the same temperature and pressure, contain an equal number of molecules.

• It states that the volume of a gas is directly proportional to its temperature at constant pressure.

• It states that the pressure of a gas is inversely proportional to its volume at constant temperature.

• It states that the number of moles of a gas is equal to its mass divided by its molar mass.

What is sublimation?

• The process where a solid changes directly into a gas without passing through the liquid phase, often occurring at low pressure and temperature.

• The process of a gas turning into a liquid when cooled.

• The process where a liquid changes into a solid upon freezing.

• The process of a solid becoming a liquid when heated.

What is the definition of a gas?

• A state of matter with a definite shape and volume.

• A state of matter with no fixed shape or volume, where particles are far apart and move freely.

• A state of matter that is always solid and rigid.

• A state of matter that can only exist at extremely low temperatures.

What is the phase diagram of a substance?

• A graphical representation showing the phases of a substance at different temperatures and pressures.

• A chart that lists the chemical properties of a substance.

• A visual tool used to predict the reaction rates of substances.

• A diagram that illustrates the molecular structure of a substance.

What is the strongest intermolecular force of attraction in polar molecules?

• Hydrogen bonding

• London dispersion forces

• Dipole-Dipole interactions

• Ionic bonding

Define intermolecular forces.

• Forces of attraction or repulsion between neighboring particles (atoms, molecules, or ions).

• Forces that occur only within a single molecule.

• Forces that are only present in solids.

• Forces that determine the color of substances.

What is the critical point in a phase diagram?

• The temperature and pressure at which the distinction between liquid and gas phases disappears.

• The point at which a substance changes from solid to liquid.

• The temperature at which a substance boils under standard atmospheric pressure.

• The pressure at which a substance can exist as a solid, liquid, and gas simultaneously.

What is the relationship described by Charles's Law?

• At constant pressure, the volume of a gas is directly proportional to its temperature in Kelvin.

• At constant volume, the pressure of a gas is directly proportional to its temperature in Kelvin.

• At constant temperature, the volume of a gas is inversely proportional to its pressure.

• At constant pressure, the volume of a gas is inversely proportional to its temperature in Kelvin.

What happens during melting?

• The process where a solid turns into a liquid as it absorbs heat.

• The process where a liquid turns into a gas as it loses heat.

• The process where a solid remains unchanged in temperature while absorbing heat.

• The process where a gas turns into a liquid as it cools down.

What does Boyle's Law state?

• At constant temperature, the pressure of a gas is directly proportional to its volume.

• At constant temperature, the pressure of a gas is inversely proportional to its volume.

• At constant temperature, the volume of a gas is directly proportional to its temperature.

• At constant temperature, the pressure of a gas is equal to its volume.