solids, liquids and gases

Question 1

what is density

Answer 1

concentration of of mass

Question 2

What is the equation for density

Answer 2

density=mass/volume m=P/v

Question 3

What sort of units are used for density

Answer 3

g/cm^3 kg/cm^3 g/m^3 kg/m^3 g/km^3 kg/km^3

Question 4

how do you find the volume of regular objects

Answer 4

v=BxHxL

Question 5

how do you find the volume of a sphere

Answer 5

v=4/3xPIxR^3

Question 6

How do you find the volume of an irregular object

Answer 6

using the eureka can experiment (measuring how much water comes out the can when you put the object in it)

Question 7

what is 1ml in cm^3

Answer 7

1ml=1cm^3

Question 8

what is the equation for pressure

Answer 8

p=F/a

Question 9

what units are used for pressure

Answer 9

N/m^2 Pa N/cm^2 N/km^2

Question 10

what is 1Pa equivalent to

Answer 10

1Pa=1N/m^2

Question 11

How many cm^2 are in a m^2

Answer 11

10000cm^2=1m^2

Question 12

How many mm^2 are in a m^2

Answer 12

1,000,000mm^2=1m^2

Question 13

How does pressure vary in fluids

Answer 13

pressure in fluids act in all different directions

Question 14

How does depth affect pressure in fluids

Answer 14

depth causes pressure in fluids to increase

Question 15

What is the equation for total pressure

Answer 15

P=pxgxh+atmospheric pressure(100,000Pa)

Question 16

what is the equation for change in pressure

Answer 16

P=pxgx(h2-h1)

Question 17

explain pressure in gases

Answer 17

gas molecules move in a random motion, they collide with the side of the container exerting a force over an area p=f/a so therefore it exerts pressure

Question 18

what are the equations for boyle’s law

Answer 18

p1xv1=p2xv2 p1=p2xv2/v1 v1=p2xv2/p1 p2=p1xv1/v2 v2=p1xv1/p2

Question 19

why does the pressure of a fixed amount of gas increase with temperature

Answer 19

the particles gain KE, they collide with the side of the container with greater force and more frequently increasing the force over an area. increasing pressure

Question 20

what is absolute zero in degrees celsius

Answer 20

-273*c

Question 21

what is the kelvin scale

Answer 21

it starts at -273c so therefore 0K = -273c

Question 22

-270K in *c

Answer 22

-270K = -3*c

Question 23

300*c in K

Answer 23

573K = 300*c

Question 24

what is the boyle’s law equation

Answer 24

p1/t1=p2/t2

Question 25

what is the pressure-temperature law in gases

Answer 25

the pressure in a gas is directly proportional to its temperature in K (provided the same volume and amount of gas molecules)

Question 26

what is the pressure-temperature equation

Answer 26

P=KxT(kelvin’s temperature only)

Question 27

what is the definition of heat

Answer 27

a form of energy and is measure in J (Joules)

Question 28

what is the definition of temperature

Answer 28

the measurement of the average kinetic energy of the particles in *c or K

Question 29

what is the definition of specific heat capacity(SHC)

Answer 29

the amount of energy required to change 1kg of a substance by 1*c

Question 30

equation for specific heat capacity

Answer 30

c=change in energy/mass x change in temperature

c=change in Q / m x change in T

Question 31

equation for energy transferred

Answer 31

change in Q = m x c x change in T

Question 32

changes between solid to liquid

Answer 32

energy is used to weaken the bonds

Question 33

changes between liquid to gas

Answer 33

energy is used to break the bonds

Question 34

changes between gas to liquid

Answer 34

energy is transferred away to produce bonds between particles

Question 35

changes between liquid to gas

Answer 35

energy is transferred away to strengthen bonds

Question 36

what factors effect the melting and boiling point

Answer 36

• adding impurities (salt, sugar, e.t.c)

- increasing pressure increases boiling point and decreases melting point

Question 37

how does evaporation occur not at the boiling point

Answer 37

at the surface some particles will have enough KE to escape so therefore it can happen at any temperature

Question 38

factors effecting the rate of evaporation

Answer 38

• surface area
• temperature
• wind blowing across the surface