Density revision Flashcards
What is density?
How compact or concentrated something is. How much matter something is made up of.
What is the equation triangle for density?
d = m/v
What is the equation for mass?
mass = density x volume
What is the equation for volume?
volume = mass/density
What are the properties of dense material particles?
The particles in a dense material are closer together than in a less dense material. The bonds are more secure.
What are the properties of less dense material particles?
The particles in a less dense solid are further apart compared to a dense material. The bonds are not as secure as a dense material.
What are the properties of particles in a solid?
They are in a regular arrangement
Vibrate in a fixed position
They are very close together
What are the properties of particles in a liquid?
They are randomly arranged
They are close together
Move around each other
What are the properties of particles in a gas?
They are randomly arranged
Move quickly in all directions
They are far apart (free to roam)
Not chemically bonded
Where do particles have their energy?
Particles have energy in their kinetic energy stores and potential energy stores.
What is internal energy store?
Internal energy store of a system is the total energy that the particles have in their kinetic and potential energy stores.
What does heat do to particles?
Heat transfers energy in their kinetic energy stores, increasing the internal energy.
Why does change of state occur?
Change of state occurs because the energy transferred from the heat is used to weaken and, eventually, break the bonds.
What is it called when a solid becomes a liquid?
Melting
What is it called when a liquid becomes a solid?
Freezing
What is it called when a liquid becomes a gas?
Evaporation/boiling
What is it called when a gas becomes a liquid?
Condensation
What is it called when a solid becomes a gas?
Sublimation
What is Hooke’s Law?
If you double the force of a spring, you double the length of a spring.
How do you work out the density of a regular solid?
Weigh the solid and use the equation triangle to figure the density out. Density = mass/volume
The volume of a solid is: length x width x height
How do you figure out the density of an irregular solid?
You use displacement. This is when an object is fully immersed in water and pushes the fluid out of the way to take its place.
You measure a certain amount of water and record that number. Then place the object in the water and record where the water is. Subtract the after volume and the before. This becomes the volume. The mass is then divided by the volume to give the density.
What is the density of a cube?
Use the method for finding a regular solid. The volume is length x width x height.
What is the equation for calculating weight (on any planet/moon)?
Weight (N) = Mass (Kg/g) x Gravitational Field Strength (N/Kg)
