particles - density Flashcards

calculation, practical 5

1
Q

what is the equation for density

A

density = mass/volume
p = m ÷ v

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

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2
Q

what is density

A

the mass of a material per unit of its volume

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3
Q

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

A
  • 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
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4
Q

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

A
  • 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
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5
Q

what to do for liquids in practical 5: measuring density

A
  • 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
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