RP: Investigating density

• What are the small particles that matter is made up of?

  Atoms
• How do atoms exist in relation to each other?

  Atoms can exist on their own or together as molecules
• How many atoms end to end would measure 1 centimetre?

  Around 100,000,000 atoms
• What is the aim of the density investigation experiment?

  • To measure the density of various materials
• What are the methods used to investigate density?

  1. Regular solids
  2. Irregular solids
  3. Liquids
• How do you calculate the volume of a cube?

  Volume = length × width × height
• What is the formula to calculate the volume of a sphere?

  Volume = \(\frac{4}{3} \pi \left(\frac{d}{2}\right)^3\)
• What is the mass of the steel cube in the experiment?

  468 g
• What is the volume of the steel cube in the experiment?

  60 cm³
• How do you calculate the density of an object?

  Density = mass ÷ volume
• What is the density of the steel cube?

  1. 8 g/cm³
• What is the mass of the steel sphere?

  33 g
• What is the volume of the steel sphere?

  1. 19 cm³
• What is the density of the steel sphere?

  1. 9 g/cm³
• What is the mass of the stone used in the experiment?

  356 g
• What is the volume of the stone?

  68 cm³
• What is the density of the stone?

  1. 2 g/cm³
• What is the mass of 50 cm³ of water?

  50 g
• What is the density of water?

  1 g/cm³
• What are some sources of experimental error in measuring density?

  • Calibration differences in balances
  • Resolution differences in measuring cylinders
  • Incorrect setup of displacement can
  • Additional drops of water causing spills
• Why might the density of steel show two different values in the experiment?

  Measurements may be taken to different significant figures, causing rounding errors
• What are the hazards and control measures in the density experiment?

  Hazards:

  • Water spills causing slips

  
  

  Control measures:

  • Use a measuring cylinder to collect displaced water