Topic 3-Particle model of matter Flashcards
What is density?
Density is a measure of the ‘compactness’ of a substance.
What is the equation for density?
Density=mass divided by volume.
What does the density of an object depend on?
What it’s made of and how the particles are arranged.
What are the particles like in a less dense material?
They are spread out.
What are the three states of matter?
Solids,liquids and gases.
What is the force of attraction like for solids?
Strong.
What is the force of attraction like for liquids?
Weaker than solids but stronger than liquids.
What is the force of attraction like for gases?
Weak.
How much energy does a solid have?
Not that much -they can only vibrate about their positions.
How much energy does a liquid have?
More energy than a solid but not as much as a gas.
How much energy does a gas have?
A lot because the particles are free to move.
How do the particles in a gas behave?
They travel in random directions at high speeds.
Does a gas have a high density or a low density?
Low density.
Does a solid have a high density or a low density?
High density.
How do you find the density of a solid object?
1) Use a balance to measure the mass.
2) Submerge the object in a eureka can filled with water.
3) The water displaced by the object will be transferred to the measuring cylinder.
4) Record the volume of the water in the measuring cylinder.
5) use the volume and mass to work out density in the formula.
How do you find the density of a liquid?
1) place a measuring cylinder on a balance and zero it.
2) pour 10ml of the liquid into the measuring cylinder and record the mass.
3) pour another 10ml into the measuring cylinder repeating the process until it is full, recording the total volume and mass each time.
4) for each measurement use the formula to find the density.
5) take an average of results.