L2 Density

• Density: How much volume is packed into an object.
• Formula:

  $ρ =$$m / v$
• Regular solid:

  1. Measure the dimensions of the solid and calculate the volume.
  2. Measure the mass of the solid.
  3. Calculate density by dividing the mass by the volume.
• Irregular solids:

  1. Find the mass of the solid.
  2. Obtain a beaker.
  3. Fill the beaker with enough water to submerge the solid and record its volume.
  4. Place the volume in the beaker and record the new volume.
  5. Subtract the initial volume from the new volume.
  6. Calculate the density by dividing the mass by the volume.
• Note that 1ml = 1cm³.
• Density of a Liquid:

  1. Find the mass of an empty beaker.
  2. Pour 50ml of the unknown liquid into the beaker.
  3. Find the mass of the beaker with the liquid.
  4. Subtract the original mass from the new mass.
  5. Calculate the density by dividing the mass of the liquid by the volume (in this case, 50ml).
• As temperature increases, density decreases as particles have energy to spread apart and move freely.
• As temperature decreases, density increases as particles lose energy and therefore move less and move closer together.
• As concentration increases, density also increases as it adds to the mass per unit volume of the solution. There are more particles in a small space.