P3- Particle Model Of Matter

Question 1

how do you find the density of an object?

Answer 1

1) Use a balance to measure its mass
2) If it’s a regular solid, start by measuring its length, width and height with an appropriate piece of equipment (e.g. a ruler). Then calculate its volume using the relevant formula for that shape.
3) For an irregular solid, you can find its volume by submerging it in a eureka can filled with water.
The water displaced by the object will be transferred to the measuring cylinder
measuring cylinder
4) Record the volume of water in the measuring cylinder. This is the volume of the object.
5) Plug the object’s mass and volume into the formula above to find its density.

Question 2

how to find the density of a liquid?
-practical-

Answer 2

Place a measuring cylinder on a balance and zero the balance.
2) Pour 10 ml of the liquid into the measuring cylinder (see p.232) and record the liquid’s mass.
3) Pour another 10 ml into the measuring cylinder, repeating the process until the cylinder is full and recording the total volume and mass each time.
4) For each measurement, use the formula to find the density.
(Remember that 1 ml = 1 cm’.)
5) Finally, take an average of your calculated densities. This will give you a value for the density of the liquid.

Question 3

Colliding gas particles creates…

Answer 3

…pressure.

Question 4

whats it called when a solid turns into gas?

Answer 4

sublimating

Question 5

what is internal energy?

Answer 5

Internal energy is the total energy stored by particles in a system.

Question 6

A state of change requires..

Answer 6

..energy

Question 7

what is specific latent heat?

Answer 7

The specific latent heat (SLH) of a substance is the amount of energy needed to change 1 kg of it from one state to another without changing its temperature.