States of Matter

Ether and alcohol are highly volatile liquids. They evaporate quickly at room temperature, so they must be kept in airtight bottles to prevent loss through evaporation.

Pure substances have a fixed composition and consistent physical and chemical properties throughout any given sample.

Diffusion is the movement of particles from a region of higher concentration to lower concentration. Because gas particles have high kinetic energy and large intermolecular spaces, they diffuse much faster than liquids or solids.

Solids are characterized by having a definite shape and a definite volume because their particles are fixed in a rigid structure.

The four fundamental states of matter are solid, liquid, gas, and plasma. Plasma is considered the fourth state.

Solid carbon dioxide is known as dry ice because it undergoes sublimation directly from a solid to a gas at atmospheric pressure, leaving no liquid behind.

The boiling point of ethanol (common alcohol) is approximately 78 degrees Celsius at standard atmospheric pressure.

Sublimation is the phase transition where a substance changes directly from a solid to a gas without passing through the liquid phase.

Evaporation is the surface phenomenon where liquid molecules gain enough energy to escape into the vapor phase at temperatures below the boiling point.

Crystallization is the standard laboratory process used to separate a solid solute from a solution by cooling or evaporating the solvent. Sublimation is for solids that transition directly to gas, and filtration separates insoluble solids from liquids.

Evaporation rate depends on the strength of intermolecular forces and boiling points. Water has strong hydrogen bonding and a higher boiling point compared to alcohol or ether, making it evaporate the slowest among the choices.

Evaporation is an endothermic process because it requires the input of energy (latent heat of vaporization) to overcome the intermolecular forces holding the liquid molecules together. This energy is absorbed from the surroundings, causing a cooling effect.

A pure substance consists of only one type of matter or substance, whereas a mixture contains multiple substances.

A homogeneous mixture is defined by its uniform composition and properties throughout. Heterogeneous mixtures have non-uniform compositions.

In a solution, the substance being dissolved is the solute, while the substance doing the dissolving is the solvent.