Density

• Who is demonstrating the GCSE required practical on density?

  1. Reese
• What types of objects will be measured for density?

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

  Density is how heavy a material is
• How do we calculate density?

  Mass divided by volume
• In what units is mass measured?

  Kilograms or grams
• In what units is volume measured?

  Meters cubed or centimeters cubed
• What is the unit for density when using grams and centimeters cubed?

  Grams per centimeter cubed
• What are the dimensions of the brass block measured?

  5 cm length, 2 cm width, 2 cm height
• How do you calculate the volume of a cuboid?

  Multiply length, width, and height
• What is the volume of the brass block?

  $20 \text{ cm}^3$
• What is the density of the brass block?

  $9 \text{ g/cm}^3$
• What is a vernier caliper used for?

  To measure dimensions with high precision
• To what precision can the vernier caliper measure?

  To the nearest 0.05 millimeters
• How do you measure the width of the aluminium cube with a vernier caliper?

  Open jaws and align with the block
• What is the final width of the aluminium cube?

  $1.89 \text{ cm}$
• What is the principle used to measure the volume of irregular objects?

  Displacement of water
• What is the name of the can used for measuring displacement?

  Arica can
• Who is the Arica can named after?

  Archimedes
• How do you fill the Arica can for measuring displacement?

  Fill until it drips from the hole
• What is the volume of water displaced by the mass?

  $130 \text{ cm}^3$
• What is the density of the mass used in the displacement measurement?

  $7.7 \text{ g/cm}^3$
• What is the first step in measuring the density of a liquid?

  Tare the balance with the measuring cylinder
• What is the density of pure water?

  $1.0 \text{ g/cm}^3$
• What is the density of the sugar solution measured?

  $1.1 \text{ g/cm}^3$
• What does a density of 1.1 g/cm³ for the sugar solution indicate?

  It has more mass than pure water
• How is concentration often expressed for compounds in water?

  Grams per decimeter cubed
• How many grams of sugar are in one decimeter cubed of solution?

  $100 \text{ grams}$