Put page 28 on your density handout.

Start a page 27 Cornell Notes:TOPIC: DENSITYOBJ: Manipulate chemical quantities using scientific conventions.ESQ: How can slope determine density of an object?

Check wall for updated grades as of midnight!ELEMENT QUIZ #2 tmrwDensity HW (front & back) due tmrw

DensityDensity: ratio of mass to volume characteristic property that depends

on the composition of a substance does not depend on the size of the

sample intensive physical property

IntensiveExtensiveColor LengthBoiling Point # of atomsPhase of matter (S, L, G) Mass

Density ColumnIn

creasi

ng D

ensi

ty

Largest Density

Smallest Density

Density Column Practice!!Four liquids were placed in a graduated

cylinder and they formed 4 layers – use colored pencils to color in the layers formed

Five objects were then dropped into the density column. --Draw the objects on your column.Color Density

(g/mL)

Red 1.00

Green 0.75

Blue 1.10

Orange 1.25

Object Density (g/mL)

2.75

1.04

0.9

0.65

Equation

D=m

V

D: density (g/mL or g/cm3)

m: mass (g)

V: volume (mL or cm3)

Example #1

What is the density of a material that has a mass of 15 g and a volume of 3 mL?

Example #2What is the mass of an object if its density is 2 g/cm3 and its volume is 5 cm3?

Example #3

What is the volume of a liquid with a density of 2.0 g/mL and a mass of 8 g?

Think about this, genius!!

A sample of water has a mass of 10.0 g and a volume of 10.0 mL

m = _______

V = _______

10.0 g

10.0 mL

D =

D = 1.00 g/mL

10.0 g / 10.0 mL

Example #4

Half of the water is removed.

Predict what will happen to the density.

Terrific Tuesday

• Check wall for updated grades as of midnight!• Get out density HW page• Get out new piece of blank paper• Use the ziploc of elements to quiz your table!

• ELEMENT QUIZ #2 tmrw• Density HW (front & back) due tmrw

• PINK OUT PEP RALLY FRIDAY FOR S’MORES!!!

Percent ErrorRelative error equation

Actual - Theoretical

Percent Error = Experimental - Acceptedx 100 Accepted Theoretical

Absolute value (no negatives allowed)

Let’s calculate the % error of a lab group that measured the dimensions for steel.

The calculated values of the steel were: Mass of sample: 15.85 gLength of sample: 2.26 cmWidth of sample: 1.80 cmHeight of sample: 2.41 cm

The true value for the density of steel is 7.8 g/cm3.

Percent Error = Experimental - Acceptedx 100% Accepted

Page 29 – Density Mini-Lab• Section 1 (top ½ of page)– Determine density of 5 liquids and 2 solids using

tools provided on side counter– Chemicals on back table – they stay put!!!– No more than 10 mL of each liquid

• Section 2 (bottom ½ of page)– Draw two 100 mL graduated

cylinders– Left prediction – Right actual experiment PR

EDIC

TIO

N

ACTU

AL