GET CLICKER WOD QUIZ

How can matter be identified based on physical properties?

What are physical properties?

Physical properties are any characteristics of a material, that must be observed without

changing the identity of the material.

Cotton Candy

TableSalt

Compare the following in DOUBLE BUBBLE:

Cotton Candy and Table Salt

Cotton Candy

TableSalt

Cotton Candy

TableSalt

Physical Properties• Color

• Mass & volume

• Smell & taste

• Size & shape

• density

One important physical property:

DENSITY

Density – amount of mass in a given volume

• Unique to every substance

• Does not change = physical constant

• Can be used to identify unknown materials

Color Code Your Density Equation

• D = Density (g/mL or g/cm3)• M = Mass (grams or g)• V = Volume (milli-liters or mL)

(centi-meters or cm3)

D = MV

Density Equation

Top of Paper

Density Equation

Practice 1: write question in notes.

• What is the density of sample if its mass is 44.3 g and its

volume is 22.1 cm^3?

Densities of common substances:

• Water 1.0 g/cm3

• Alcohol .789 g/cm3

• Gold 19.3 g/cm3

• Air .00129 g/cm3

Rounding Rules

• 0 to 4 ADD NO MORE

• 5 to 9 ADD ONE TO THE LINE

• So for example:• 0.53 • 0.5

• So for example:• 0.57• 0.6

Round each number to the nearest tenth.1 ) 9.54 2 ) 5.873 ) 5.924 ) 5.245 ) 5.646 ) 7.777 ) 1.888 ) 1.549 ) 2.42

THE MAGIC TRIANGLE:

D

M

V

Practice Problems

• Always follow these steps and show all work:

To solve this problem, first I …

Then I …

This answer is …

… because

D = M / V

Write the equation!

Fill in the variables, number and units!

D = 44.3 g / 22.1 cm^3

Calculate and give the answer with unit(s)!

D = 2.0 g/cm^3

Always round to the tenth position for example 1.12 would be 1.1

Answer the following:

• 1. = #7 (no decimal)

• 2. = #2

• 3. = #3 (no decimal)

• 4. = #4

• 5. = #6

OMIT #5 on paper…skip it and go to #6!

Use the @ sign for your decimal.

Density = mass Volume

• A piece of tin has a mass of 16.52 g and a volume of 2.26 cm3. What is the density

of tin?

A man has a 50.0 mL bottle completely filled with 163 g of a slimy green liquid. What is

the density of the liquid?

1930 grams of an unknown metal has a volume of 10 cm3. What is the density of

the metal? What metal is it? (Look in your notes)

The Magic TriangleA piece of metal has a density of 11.3 g/cm3 and a volume of 6.7 cm3. What is the

metal’s mass?

The density of a piece of brass is 8.4 g/cm3. If the mass of the brass is 510 grams, find the volume of the brass.

THE MAGIC TRIANGLE:

D

M

V

Girls = Even Numbers Boys – Odd Numbers

Quiz Tomorrow for Density,

Using Steps and Triangle!

Density Lab• Find the density of

unknown objects.– D = M / V– Density = Mass / Volume– Get mass and volume of

each object and solve for density.

– Match density to the chart and tell me what you got.

• 2 cubes: (hint – l * w * h)– A = small cube– B = big cube

• 1 odd shaped object (hint – graduated cylinder)

Color Density

Gold 19.30 g/mL

Copper 8.9 g/mL

Brass 8.0 g/mL

Steel 7.6 g/mL

Aluminum 2.7 g/mL

Acrylic 1.16-1.19 g/mL

Nylon 1.13 g/mL

PVC 1.39-1.42 g/mL

Use this chart to answer questions: