IB Physics – Topic 3 – Thermal Physics (Core)

question

Atom
answer

The smallest unit of matter
question

Element
answer

A kind of material that is made up of only one type of atom
question

Compound
answer

Materials made from molecules that contain more than one type of atom
question

The implications of Avogadro’s constant
answer

A mole of any material contains 6.022*10^23 atoms or molecules
question

The three states of matter
answer

Solid, Liquid, Gas
question

The physical properties of Solid in terms of molecular structure & particle motion
answer

Fixed shape & volume; Molecule held in position by force, vibrate but don’t move around
question

The physical properties of Liquid in terms of molecular structure & particle motion
answer

No fixed shape but fixed volume; Force between molecules not so strong so molecules can move around
question

The physical properties of Gas in terms of molecular structure & particle motion
answer

No fixed shaper or volume; No forces between molecules
question

Temperature
answer

The intuitive concept of \”hotness\” or \”coldness\” of a substance
question

The relation between the Kelvin & Celcius scales of temperature
answer

T(K)=t(C)+273
question

Thermal Energy
answer

Energy that is transferred from one body to another as a result of a difference in temperature
question

Internal Energy
answer

The total kinetic energy of the molecules of a substance, plus any potential energy associated with forces between the molecules
question

The relationship between Internal Energy & Temperature
answer

The average kinetic energy of the molecules of an ideal gas is directly proportional to the absolute temperature of the substance in Kelvin.
question

Specific Heat Capacity
answer

The amount of thermal energy required to raise the temperature of one kilogram of one substance by one Kelvin
question

Thermal Capacity
answer

The product of the Specific Heat Capacity of a substance & its mass
question

The formula involving Specific Heat Capacity
answer

Q=mc*deltaT (Q=Thermal Energy, c=Specfic Heat Capacity)
question

How Thermal Equilibrium does occur
answer

When two bodies are in contact, Thermal Energy will be transferred from the hotter body to the colder one until both bodies have the same temperature. This state is called Thermal Equilibrium
question

Specific Latent Heat
answer

The amount of thermal energy required to change the state of a substance
question

Latent Heat
answer

The product of the Specific Latent Heat of a substance & its mass
question

Melting
answer

The process of changing a substance from Solid to Liquid
question

Freezing
answer

The process of changing a substance from Liquid to Solid
question

Evaporation
answer

The process of changing a substance from Liquid to Gas
question

Condensation
answer

The process of changing a substance from Gas to Liquid
question

Pressure
answer

The normal force to an area per unit area
question

The assumptions of the kinetic model of an ideal gas
answer

A gas consists of a large number of molecules; Molecules move with a range of speeds; The volume of the molecules is negligible compared with the volume of the gas; The collisions of the molecules with each other & the boundaries are elastic; Molecules only exert forces on each other when in contact

Get instant access to
all materials

Become a Member