Density is defined as mass per unit volume. It is a measure of how tightly packed and how heavy the molecules are in an object. Density is the amount of.

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Presentation transcript:

Density is defined as mass per unit volume. It is a measure of how tightly packed and how heavy the molecules are in an object. Density is the amount of matter within a certain volume. Which has the greatest density? Why? Density Notes

Two related terms of Density 1- Mass- the amount of matter in an object; it is how much stuff an object has Unit used for mass is grams (g) and kilograms (kg) How measured: scale Which has more mass? Why?

2 term related to Density Volume- the amount of 3-dimensional shape an object occupies Can be measured by: Volume = L * W * H (box or cube) Graduated Cylinder (for a liquid) (beaker) Displacement (irregularly shaped object) Units for volume: cm 3, in 3, Liters (L), mL

Volume 1) Which has the greatest volume? Figure it out. 2) Which has the greatest volume?

Calculating Density The formula for density is: Density = Mass Volume Units: g/mL, g/cm 3, kg/L

Units for density g/cm 3 or g/mL Formula: M = mass V= volume D = density M = D x V V = M / D D = M / V

1)Find the mass of the object 2)Find the volume of the object 3)Divide : Density = Mass - Volume To find density : Set up your density problems like this: Givens: Unknown: Formula: D = M / VSolve Ex. If the mass of an object is 35 grams and it takes up 7 cm 3 of space, calculate the density.

Calculate the volume of a liquid with a mass of 10 g and whose density is 2 g/mL. - givens: –unknown: –formula for unknown: –plug in values and solve.

To find the density 1- Find the mass of the object- use a scale 2- Find the volume of the object- 3- Divide Density = Mass Volume

Density Units Density- the amount of mass in a given volume. Density = mass / volume Units- kg/L or kg/m 3 g/mL or g/cm 3

The density of gold is approximately 19 g/cm 3 1) How much would 2 cm 3 of gold weigh? 2) What is the mass of 1 cm 3 of gold?

A liquid has a density of 2 g/mL. What exactly does this mean?

A liquid has a density of 1.5 g/mL. 1)What is the mass of 1 mL of this liquid? 2) What is the mass of 2 mL of this liquid? 3) What is the mass of ½ a mL of this liquid?

Proof that water and ice have different densities

1)Find the mass of the object 2)Find the volume of the object 3)Divide : Density = Mass - Volume To find density : Ex. If the mass of an object is 35 grams and it takes up 7 cm 3 of space, calculate the density.