Density Concepts and Calculations

Density Concepts

• Density is the amount of matter per unit volume of a substance.
• Density is a physical property of matter. Each substance has a unique density.
• Density is measured in g/cm³ or g/mL.
• Mass is how much matter an object contains, measured in grams (g) or kilograms (kg).
• Volume is the space an object occupies, measured in mL, L, cm³, or m³.
• Materials with high density have more particles packed into a smaller space.

Density Formula and Calculations

• The formula for density is: Density (d) = Mass (m) / Volume (V).
• To solve density problems, use the formula d = m/V.
• Units for density, mass and volume must be consistent (e.g., if mass is measured in grams, volume units must be cm³ or mL).

Class Schedule and Activities

• February 27th - Density Activity
• February 27th - Density Lab
• February 27th - Density lab review due
• March 6th- Review Periodic table, elements and compounds
• March 20th - Patterns in the Periodic Table
• March 6th - Elements and Compounds
• March 20th - Molecular compounds
• March 23rd - Ionic compounds
• March 23rd-Flame tests
• March 27th -Gas tests & Chemical Reactions
• March 27th - Review
• March 28th - Chemistry Unit Test
• Use textbook for examples and charts
• Use the provided formula triangle to solve problems efficiently.

Additional Notes Based on Examples

• To find the substance of a material with a given mass and volume use a table of known densities

• Example: Cube with a mass of 96.5g and a volume of 5 cm³ is gold (density of 19.3 g/cm³).

• Example: Calculate mass of an aluminium bar with dimensions of 8.0 cm long, 3.2 cm wide, and 1.5 cm high. The density of aluminum is 2.70 g/cm³. Calculating volume gives 38.4 cm³ and mass is 104g

• Example: A liquid with density 8.8 g/mL and a mass of 21.1g has a volume of 2.4 mL

• Watch the 4-minute video on Density at the given link.