matter in our surroundings TB FC

What is the boiling point?

• Temperature at which a liquid becomes gas (For water = 373 K or 100°C)

• Temperature at which a solid becomes liquid

• Temperature at which a gas condenses into a liquid

• Temperature at which a liquid freezes

What is matter?

• Everything that occupies space and has mass.

• A substance that can be seen but not touched.

• Anything that can be measured in terms of volume only.

• A form of energy that can be converted into mass.

States of matter?

• Solid: Definite shape and volume, rigid, incompressible

• Liquid: No fixed shape, fixed volume, fluid, can flow

• Gas: No fixed shape/volume, highly compressible, fastest movement

• Plasma: Ionized gas with free electrons and ions, conducts electricity

Characteristics of particles of matter?

• Have space between them, continuously move (kinetic energy), attract each other (interparticle force).

• Are always stationary and do not move at all.

• Are tightly packed and do not have any space between them.

• Have no forces acting between them and are independent of each other.

SI unit for pressure?

• Pascal (Pa)

• Newton (N)

• Joule (J)

• Watt (W)

What is evaporation?

• A process that occurs only at boiling point.

• A surface phenomenon that can happen below boiling point.

• A method of condensation.

• A type of precipitation.

SI unit for density?

• g/cm³

• kg/m³

• lb/ft³

• mg/L

What is sublimation?

• Liquid directly to solid (e.g., ice formation).

• Solid directly to gas (e.g., camphor, dry ice).

• Gas directly to liquid (e.g., condensation).

• Liquid directly to gas (e.g., evaporation).

Examples of matter?

• Air

• Light

• Sound

• Electricity

Latent heat of fusion?

• Solid to liquid.

• Liquid to gas.

• Gas to solid.

• Solid to gas.