Matter Flashcards
(29 cards)
Formula for density?
Density = mass/volume
What are the units for density?
g/cm^3 or kg/m^3
The density of an object depends on…
what it’s made of.
Does density vary with shape or size?
Nah g.
What does the average density of an object determine?
Whether it floats or sinks.
What is the easiest way to find the density of a liquid?
To use a measuring cylinder.
Measure mass of empty cylinder.
Measure mass of cylinder with liquid.
Difference in mass equals mass of liquid.
Find volume by reading it from cylinder scale.
When you heat a liquid…
the extra energy is transferred into the particles kinetic energy stores, making them move faster.
What is another way of saying thermal energy store?
internal energy store.
In kinetic theory…
temperature is a way of measuring the average internal energy store.
Materials that need to gain lots of energy to warm up also releases…
loads of energy when they cool down again.
What is the specific heat capacity?
The change in energy in the substance’s thermal store needed to raise the temperature of 1kg of that substance by 1 degree celsius.
What is the equation for change in thermal energy?
mass X specific heat capacity X change in temperature.
What is the energy used for when melting or boiling?
Used for breaking bonds between particles rather than raising the temperature.
What is specific latent heat?
Energy needed to change state.
For cooling, specific latent heat is…
the energy released by a change in state.
What is the specific latent heat for changing between a solid and a liquid called?
The specific latent heat of fusion.
What is the specific latent heat for changing between a liquid and a gas called?
Specific latent heat of vaporisation.
How can you work out the energy needed when a substance of mass changes state?
Thermal energy = Mass X Specific latent heat.
What is the temperature -273 degree celsius known as?
Absolute zero.
How do you convert from degrees celsius to Kelvin?
Just add 273 cuh.
What are elastic objects?
Objects that can go back to its original shape and length after the force has been removed.
An object has been inelastically distorted if it…
doesn’t return to its original shape and length after the force has been removed.
What is the elastic limit?
The point where an object stops distorting elastically and begins to distort inelastically.
How much of the energy is transferred to the object’s elastic potential energy store if its elastically distorted?
ALL of the energy.
