Density

Question 1

Density definition

Answer 1

The density of an object is its mass per unit volume

Question 2

The relationship between mass and volume method

Answer 2

Measure the mass of the block using the electronic balance
Measure the length,breadth and height using a ruler
Record the results in a table
Draw a graph of mass (y axis) against volume (x axis )

Question 3

Table

Answer 3

Block
Mass/g
Volume/cm3

Question 4

Conclusion on graph (regular block)

Answer 4

Mass is always directly proportional to volume. For each material , the graph is a straight line that goes through the origin

Question 5

Mass and volume (formula)

Answer 5

Mass a volume

Question 6

How to calculate the gradient

Answer 6

Rise over run
(Unit = r/r )

Question 7

Density equation

Answer 7

D= M
—-
V
M= kg or g
D= kg/m3 or g/cm3
V= m3 or cm3

Question 8

Volume of cube

Answer 8

V= l x b x h

Question 9

Volume of cylinder

Answer 9

V= pier2 x l

Question 10

To find the density of a liquid method

Answer 10

Measure the mass of the empty measuring cylinder using the electronic balance
Add some liquid to the measuring cylinder and record the new mass
Find the mass of the liquid by subtracting the mass of the empty measuring cylinder
Measure the volume using the measuring cylinder - read at eye level
Calculate the density using d= m
V

Question 11

Find the entity of an irregular object

Answer 11

Measure the mass of the object using the electronic balance
Add some water to the measuring cylinder
Measure the volume of water in the measuring cylinder
Submerge the object in the liquid ( be careful to avoid any splashes)
Measure the new volume of the water and object - read measuring cylinder at eye level
Calculate the volume of the object
Calculate the density using d = m
V

Question 12

Floating and sinking

Answer 12

If a material is denser than its surroundings it will sink, and if it less dense than its surroundings it will float

Question 13

Solid

Answer 13

Greatest forces of attraction are between the particles in a solid , they’re tightly packed in an order arrangement
Particle are too strongly held together to allow movement from place to place, particle vibrate about their position in the structure
Solids have the greatest density because the particles are closest together

Question 14

Liquid

Answer 14

There are weaker forces of attraction between the particles compared to solids , but not much greater than gases
Particles move around each other
Liquids have a lower density than solids as particles are further apart

Question 15

Gases

Answer 15

The particles are widely spaced and scattered at random through the container
The particles move rapidly in all directions
Gases have a very low density as the particles are very far apart

Question 16

Density order

Answer 16

Solid>liquid&raquo_space;»gases