particles - density

Question 1

what is the equation for density

Answer 1

density = mass/volume
p = m ÷ v

mass - kg
volume - cubic metres
density - kg/m^3
(can also be g/cm^3)

Question 2

what is density

Answer 2

the mass of a material per unit of its volume

Question 3

what to do for regular solids in practical 5: measuring density

Answer 3

• use a RULER to measure the length, width, and height of the block (mm precision)
• multiply these to find the volume of the regular shape
• use an electronic balance to determine mass of the block
• calculate density of the regular shape using p = m ÷ v

Question 4

what to do for irregular solids in practical 5: measuring density

Answer 4

• fill a eureka can with water until it is flowing out of the spout
• wait until the spout stops dripping water and then place a measuring cylinder under the spout
• attach a string to the irregular object so you can carefully lower it into the can
• the water flowing out of the spout will collect in the measuring cylinder which is the volume of the object
• use an electronic balance to determine the mass of the irregular object
• calculate density of the irregular shape using p = m ÷ v

Question 5

what to do for liquids in practical 5: measuring density

Answer 5

• find the mass of an empty measuring cylinder
• add 20cm^3 of the salt solution into the cylinder (measure with care)
• place the filled cylinder on electronic balance - record the mass - subtract the mass of the empty cylinder
• once you have the mass of the solution, repeat the steps for 5 other volumes of the solution and record results in a table
• plot a graph of mass (y) against volume (x) and calculate the gradient of the line of best fit to get the density