P6 - Molecules And Matter (PAPER 1) Flashcards
What is the formula for density
Density (kg/m^2) = mass (kg) / volume (m^2)
How can you tell if an object floats in water by its density
Objects with a lower density than water (<1000kg/m^2) float in water
Are particles in different states of matter able to flow
Solid - no
Liquid - yes
Gas - yes
Can the volume of different states of matter be changed
Solid - fixed
Liquid - fixed
Gas - can be changed
Can the shape of different states of matter be changed
Solid - fixed
Liquid - Fits the shape of container
Gas - Fills container
What are the density of different tastes of matter
Solid - high
Liquid - Medium
Gas - Low
Why does the mass of a substance stay the same when it changes state
Because the number of particles stay the same
What are the melting and boiling points of substance and what are they for water
The temperature where the substance melts and boils at
Water melts at 0C, Water boils at 100C
What is the diffference between boiling and evaporating
Boiling happens at the boiling point
Evaporating happens below the boiling point
What is needed to melt a solid or boil a liquid
Energy
How does increasing the temperature of a substance affect its internal energy
It’s internal energy increases
What happens to the particles when a substance is heated
They gain more energy and start to vibrate faster, until they vibrate fast enough to break apart the bonds holding them in place
What is latent heat
The energy needed for a substance to change its state without changing its temperature
What is the latent heat of fusion
The amount of energy needed to change the state of 1kg of a substance without changing its temperature
What is the formula for the specific latent heat of fusion
Specific latent heat of fusion (J/kg) = energy (J) / mass (kg)