Solids, Liquids and Gases

Question 1

what is density

Answer 1

a measure of the amount of mass packed into a particular volume

Question 2

how do you find the density of a regular object

Answer 2

measure the 3 sides
find the mass using a balance
calculate the density

Question 4

how to calculate the density of an irregular object

Answer 4

measure the mass using a balance
meausre the volume by using the displacement method
- place water in a jar and measure the volume
- then place the object and meausre the volume to see how much water has been displaces
calculate the density

Question 5

what is pressure

Answer 5

the force acting over a particular area

Question 6

what is the unit of pressire

Answer 6

Pa - pascal
or
N/m2

Question 7

what happens when pressure is exerted on a liquid

Answer 7

it will act equally in all directions

Question 8

how does pressure move

Answer 8

from an area of high to low pressure

Question 9

explain pressure in a fluid

Answer 9

the pressure is exerted evenly across the whole surface of the fluid and in all directions

Question 10

how do gas particles move in a container

Answer 10

high speed in random directions

Question 11

what happens as a particle hits the side of a container

Answer 11

it will rebound creating a tiny force

Question 12

what happens when the volume of a gas container increases

Answer 12

the area will increase and so the pressure decreases

Question 13

what happens when the temperature in a gas container increases

Answer 13

particles gain more energy so move around faster and the frequency of their collisions with the walls increases
which then will increase the force meaning the pressure increases

Question 14

what is the absolute zero value

Answer 14

-273 celcius
Zero kelvin

Question 15

what is the conversion of centigrade to kelvin

Answer 15

centigrade = kelvin - 273

Question 16

what is the relationship between gas pressure and temperature (in terms of molecular movement)

Answer 16

As the temperature of a gas decreases the energy in the gas falls and the motion of the molecules will slow. Therefore the pressure will also fall

Question 17

what is the relation between surface area and force

Answer 17

if there is a large surface area there will be a smaller force (tennis shoes)
is there is a small surface area there will be a large force (high heels)