Molecules & Matter- Density Flashcards
How do you calculate density (kg/m3)?
Density (kg/m3) = mass (kg) ÷ volume (m3)
The density of a regular object can be calculated ______________.
The density of a regular object can be calculated mathematically.
Volume of an irregular object can be measured by ___________ it in water and measuring the amount of water __________.
Volume of an irregular object can be measured by submerging it in water and measuring the amount of water displaced.
how are particles arranged in a solid
- packed very close together
- arranged in a regular pattern
- particles do not move but vibrate around a fixed position
how are particles arranged in a liquid
- close together but not arranged in a regular pattern
- particles can move around each other
how are particles arranged in a gas
- far apart
- not arranged in any pattern
- rapidly moving
what is the density like for a solid
have a very high density
what is the density like for a liquid
usually have a high density
what is the density like for a gas
why?
relatively low
particles are very far apart so gases only have a small mass for their volume
true or false?
polystyrene has a high density
false
although its a solid it has a low density because its full of air spaces
what is a regular object
an object that has dimensions which are easy to measure with a ruler etc
what is an irregular object
an object which we cannot easily measure the dimensions
how do you measure the density of a regular object
work out the mass - weigh using a balance
calculate the volume
use equation
what method is used to work out the density of an irregular object
displacement
how do you measure the density of a irregular object
- work out the mass of the object using a balance
- fill a eureka can with water
- place the object into the water - the water will be displaced through the spout in the can
- measure the volume of water displaced
- use equation
