Particle model of matter Flashcards
How to find density of a regular solid object?
1) Measure the mass using a balance
2) Measure the length, height and width using a ruler
3) Calculate volume doing l x h x w
4) calculate density mass/volume
How to find the density of an irregular solid object?
1)Measure mass using a mass balance
2) Pour water into a measuring cylinder a record volume
3) place object into cylinder and record the new volume
4) Calculate volume by doing final- initial
5) Do mass/volume to find density
How to find density of a liquid?
1) Place measuring cylinder on a balance and record mass
2) Add liquid and record the mass and volume
3) Take away the mass of the cylinder to find just the mass of the liquid
4) Find density my doing mass/volume
What is internal energy?
The total kinetic energy and potential energy of all the particles.
How does heating affect a system?
It changes the energy stored within the system by increasing the energy of the particles. This either raises the temperature of produces a change of state
What is specific heat capacity?
The amount of energy required to raise the temperature of a 1kg object by 1 degree Celsius
What is specific latent heat?
The amount of energy required to change the state of a substance of 1kg without a change in temperature
In terms of KE and PE what happens when the line on a temp/time graph is increasing?
Particles are gaining kinetic energy. This makes them vibrate more around a fixed point (solid) or move faster (liquid). This increases the temperature of a substance. Internal energy increases because ke increases but potential energy stays the same
In terms of KE and PE what is happening when the line of a temp/time graph is flat?
Heat energy is being used to change the state of a substance rather than increase the temperature. Internal energy increases
because PE increases but kinetic energy stays same so temperature also stays same.
What two words describe the movement of gases?
Random and constant
