Investigating density

• What are the variables?

  1. Independent variable - Material being measured  
  2. Dependent variable - Density of the material
  3. Control variable - Temperature
• What types of objects will be measured for density in the practical?


  Regular objects, irregular objects, and liquids
• How is density defined?

  Density is how heavy a material is, depending on the amount of material
• How do we calculate density?


  Density is calculated by dividing the mass of an object by its volume
• In what units is mass measured for this practical?


  Grams
• In what units is volume measured for this practical?

  Centimeters cubed
• What is the unit for density in this practical?


  Grams per centimeter cubed
• What is the mass of the brass block used in the practical?


  180.0 grams
• How do you calculate the volume of a cuboid?


  By multiplying its height, width, and length together
• What is the volume of the brass block calculated in the practical?


  20 centimeters cubed
• What is the density of the brass block?


  9 grams per centimeter cubed
• What is a vernier caliper used for in this practical?


  To measure dimensions with greater precision than a ruler
• What is the final width of the aluminium cube measured with the vernier caliper?


  1. 89 centimeters
• What principle does the Eureka can demonstrate?


  The volume of water displaced equals the volume of the object submerged
• How do you use the Eureka can to measure the volume of an irregular object?


  By submerging the object and measuring the displaced water
• What is the mass of the object used in the Eureka can experiment?


  1000 grams
• What volume of water was displaced by the mass in the Eureka can experiment?


  130 centimeters cubed
• What is the density calculated from the mass and volume in the Eureka can experiment?


  1. 7 grams per centimeter cubed
• How is the density of a liquid measured in this practical?


  By measuring the mass of the liquid in a tared measuring cylinder
• What is the density of pure water as mentioned in the practical?


  1. 0 grams per centimeter cubed
• What is the density of the sugar solution calculated in the practical?


  1. 1 grams per centimeter cubed
• How is the concentration of sugar in water expressed?


  In grams per decimeter cubed
• How many grams of sugar are used per decimeter cubed based on the solution's density?


  100 grams
• What are the steps to measure the density of regular objects?


  1. Measure the mass using a balance.
  2. Measure the dimensions (length, width, height).
  3. Calculate the volume (length × width × height).
  4. Calculate density (mass / volume).
• What are the steps to measure the density of irregular objects using a Eureka can?


  1. Fill the Eureka can until it drips from the nozzle.
  2. Submerge the irregular object carefully.
  3. Measure the volume of displaced water.
  4. Calculate density (mass of object / volume of displaced water).
• What are the steps to measure the density of a liquid?

  1. Tare the balance with an empty measuring cylinder.
  2. Add the liquid to the measuring cylinder.
  3. Measure the mass of the liquid.
  4. Calculate density (mass of liquid / volume of liquid).