TODAY’S AGENDA 10/28 FTF (Turn in Skittles Lab!) WHY DOES ICE FLOAT ON WATER? Think-Pair-Share...

TODAY’S AGENDA 10/28FTF (Turn in Skittles Lab!)

WHY DOES ICE FLOAT ON WATER? Think-Pair-Share (1-2-2)Can you explain this? In a few sentences come up with your own explanation as to why ice floats on water.

FTF (Turn in Skittles Lab!)

WHY DOES ICE FLOAT ON WATER? Think-Pair-Share (1-2-2)Can you explain this? In a few sentences come up with your own explanation as to why ice floats on water.

Homework: Eureka Density!

TODAY IN SCIENCE CLASS – FTF Review & DiscussDensity 2-Column NotesCalculating Density PracticeExit Ticket (Explain why ice floats on water)

SWBAT Define density and use the formula for calculating density to find the density of a mystery liquid.

UNIT 3: Metric System

2 COLUMN NOTESALL OF THEM!

DENSITY

DENSITY

The measure of how much mass is contained in a given volume

THE FORMULA OF DENSITY IS:

Density = Mass / Volume

FIGURE 5: COMPARING DENSITIES - INFERRING: WHICH ITEM HAS THE GREATER DENSITY?

The bowling ball Since the bowling

ball has a greater mass, it has a greater density, even though both balls have the same volume

DENSITY

Units of Density

WHY IS DENSITY EXPRESSED AS A COMBINATION OF TWO DIFFERENT UNITS?

Because density is actually made up of two other measurements – mass and volume – an objects density is expressed as a combination of two units

Two Common Units for Density Grams per cubic centimeter (g/cm³) Grams per milliliter (g/mL)

MATH PRACTICE: WHAT IS THE DENSITY OF A WOOD BLOCK WITH A VOLUME OF 125 CM³ AND A MASS OF 57 G?

Density = mass / volume

Density = 57 g / 125 cm³

Density = 0.46 g/ cm³

MATH PRACTICE: WHAT IS THE DENSITY OF A LIQUID WITH A MASS OF 45 G AND A VOLUME OF 48 ML?

Density = mass / volume

Density = 45 g / 48 mL

Density = 0.94 g/mL

DENSITY

Densities of Common Substances

THE DENSITY OF A SUBSTANCE IS THE ______FOR ALL SAMPLES OF THAT SUBSTANCE.

Same

FIGURE 6: APPLYING CONCEPTS: HOW COULD YOU USE DENSITY TO DETERMINE WHETHER A BAR OF METAL IS PURE GOLD?

If the bar of gold has a density that is greater than or less than 19.3 g/cm³, then the sample is not pure gold.

Densities of Some Common

Substances

Substance

Density(g/cm³)

Air 0.001

Ice 0.9

Water 1.0

Aluminum 2.7

Gold 19.3

AN OBJECT WILL FLOAT IF IT IS _____ _____ THAN A SURROUNDING LIQUID.

Less dense

THINK ABOUT IT – WHEN DOES AN OBJECT SINK IN LIQUID?

When it is more dense than the surrounding liquid.

READING CHECKPOINT (PAGE 53): WILL AN OBJECT WITH A DENSITY OF 0.7 G/CM³ FLOAT OR SINK IN WATER?

An object that has a density of 0.7 g/cm³ will float in water (1 g/cm³) because it is less dense than water

TICKET OUTWHY DOES ICE FLOAT ON WATER?

1. Calculate the Density of Water and Ice Liquid water

Mass = 100 g Volume = 100 mL Density = ?

Ice Volume = 100 mL Mass = 92 g Density = ?

2. What is the formula for density?3. Explain how floating is related to density.4. Why does ice float on water (use data from

question 1)

TODAY’S AGENDA 10/29FTF (Homework Out Please!)

1.What is the formula for density?2.What two common units are used for density?3.A block of metal has a volume of 15.0 cm3 and has a mass of 40.5 g. What is the density?4.Use the table below to determine what metal it is?

FTF (Homework Out Please!)

1.What is the formula for density?2.What two common units are used for density?3.A block of metal has a volume of 15.0 cm3 and has a mass of 40.5 g. What is the density?4.Use the table below to determine what metal it is?

Homework: Density Calculations Worksheet and Complete Tower Lab (if not completed in class) !

TODAY IN SCIENCE CLASS – FTF Review & DiscussHomework ReviewDensity Tower LabCalculating Density PracticeWILT



Aluminum 2.7 g/cm3

Silver 10.49 g/cm3

Lead 11.34 g/cm3

DENSITY

It doesn’t matter what the volume or mass is, for any given substance the density will always be the same!

That’s because density is a proportion of mass to volume.

If a 1 cm3 piece of gold has a mass of 19.3 g what would the mass be of a 2 cm3 piece of gold?

Calculate the Density for each.

DENSITY TOWER Complete Pre-Lab Questions Procedure

Find the mass of an empty container (m1). Record.

Find the mass of the mystery liquid (m2). Record. Calculate the mass of the liquid (m2-m1). Record. Record the volume of the liquid. Using the mass and volume, calculate the density

of the liquid. Record density in table.

Write the density on the white board table in the appropriate place.

Complete Lab Questions #6 - #8. Now we pour them to see what happens!

WILT – TICKET OUT

What was the most difficult part of the lab? What was the easiest part of the lab?


White Board Density Activity

FTF (Homework Out Please!)

White Board Density Activity

Homework: Complete Tower Lab (blocks C & D) & re-do calculating density h.w. if needed

TODAY IN SCIENCE CLASS – Homework ReviewFTF Review & DiscussDensity Tower Lab Ticket Out

SWBAT Identify the formula for density and correctly calculate the density of 3 objects by first finding the mass and volume.


WHITE BOARD DENSITY ACTIVITY On the top of your whiteboard write the formula

for density. For each problem you will write: m = & v = Take turns! Each person is to complete 2 of the

problems. Ask your partner for help if you need it. Problems:

1. A block of wood has a mass of 100 g and a volume of 50 cm3. What is the density?

2. A small statue has a mass of 250 g and a volume of 1000 cm3. What is the density?

3. Janet calculates the mass of a 500 cm3 box to be 250.5 g. What is the density of the box?

4. Mrs. Dean uses the water displacement method to calculate the volume of a rock. The initial volume in the graduated cylinder is 50 mL and after immersing the rock it rises to 500 mL. The mass is calculated to be 1350 g. What is the density?

D =m = v =


Find the volume of the liquid using a graduated cylinder.

Record on data table. Find the mass of an empty container (m1). Record. Find the mass of the mystery liquid (m2). Record. Calculate the mass of the liquid (m2-m1). Record. Using the mass and volume, calculate the density of

the liquid. Record density in table.



DENSITY TOWER - #7

Complete the table on the back of your lab by using the calculations of your classmates.

Take a guess as to what the mystery liquids are by comparing the densities you calculated to the densities listed on the table.

Determine the “float order” by placing the most dense on the bottom (#7) and least dense on the top (#1).


D & C Block:1.Identify 3 things that are the same and 3 things that are different for each type of soda. 2.Make a prediction about whether each soda will sink or float.A & B Block:Complete Tower Lab Activity

FTF (Homework Out Please!)D & C Block:1.Identify 3 things that are the same and 3 things that are different for each type of soda. 2.Make a prediction about whether each soda will sink or float.A & B Block:Complete Tower Lab Activity

Homework: Floating & Sinking Section Summary.Tower Lab Due Tomorrow! ( A & B Blocks)

TODAY IN SCIENCE CLASS – FTF Review & DiscussHomework ReviewComplete Tower Lab Activity ( A & B Blocks)Bill Nye Buoyancy VideoBegin Coke vs Diet Coke Lab w/ video questionsWILT

SWBAT Describe how density is related to sinking and floating; what does the density of an object need to be for it to float on water? Sink in water?



Find the volume of the liquid using a graduated cylinder.

Record on data table. Find the mass of an empty container (m1). Record. Find the mass of the mystery liquid (m2). Record. Calculate the mass of the liquid (m2-m1). Record. Using the mass and volume, calculate the density of

the liquid. Record density in table.



DENSITY TOWER - #7

Complete the table on the back of your lab by using the calculations of your classmates.

Take a guess as to what the mystery liquids are by comparing the densities you calculated to the densities listed on the table.

Determine the “float order” by placing the most dense on the bottom (#7) and least dense on the top (#1).

COKE VERSUS DIET COKE LAB

DENSITY OF BLOCKS

Select 3 blocks of different sizes Procedure

Calculate the volume of the block using L x W x H. Record.

Calculate the mass of the block using a triple beam balance. Record on data table.

Use the volume and mass to find the density. Record density on table.

Would this block float or sink if placed in water?

TODAY’S AGENDA 11/1FTF (Homework Out Please!)Will it Float or Sink in Water?

M = v =M = v =M = v =

FTF (Homework Out Please!)Will it Float or Sink in Water?

M = v =M = v =M = v =

Homework: Complete Take Home Quiz (the Study Guide)

TODAY IN SCIENCE CLASS – FTF Review & DiscussCoke vs Diet Coke LabHomework ReviewWILT



WILT

Mrs. Dean found this cool rock. Shethinks it might be a mineral calledDolomite. Minerals all have uniquedensities, so if she calculates thedensity she will be able to know for surewhat it is. How can Mrs. Dean find

outthe density of the rock? BE VERYSPECIFIC!

TIME

Units of Time

WHAT IS THE SI UNIT USED TO MEASURE TIME?

The second(s) is the SI unit to measure time

Common Conversions for Time

1s =

= 60 s

1h =


1s = 1,000 ms

= 60 s

1h =


1s = 1,000 ms

1 min = 60 s

1h =


1s = 1,000 ms

1 min = 60 s

1h = 60 min

TIME

Measuring Time

WHY WOULD A STOP WATCH BE USED TO MEASURE TIME IN AN IMPORTANT RACE?

Because stop watches measure in units smaller than the second

These measurements include the tenth and hundredth of a second

READING CHECKPOINT (PAGE 53) - HOW MANY MILLISECONDS ARE IN ONE SECOND?

1,000 milliseconds

TEMPERATURE

TEMPERATURE

Units of Temperature

A COMMON UNIT TO MEASURE TEMPERATURE IS THE ___ ___.

Celsius scale

WATER FREEZES AT ______ AND BOILS AT ______.

0 °C 100 °C

THE NORMAL HUMAN BODY TEMPERATURE IS APPROXIMATELY ________.

37 °C

WHAT IS THE OFFICIAL SI UNIT FOR TEMPERATURE?

The Kelvin Scale (°K)

0 °K = 273 °C

FIGURE 8: MEASURING TEMPERATURE - OBSERVING: AT WHAT TEMPERATURE ON THE KELVIN SCALE DOES WATER BOIL?

373 °K

WHAT IS ABSOLUTE ZERO?

Absolute zero is considered by scientists to be the coldest temperature possible

0 °K or –273 °C

TEMPERATURE

Measuring Temperature

WHAT INSTRUMENT IS USED TO MEASURE TEMPERATURE?

Thermometer

TODAY’S AGENDA 10/28

FTF (Homework Out Please!)a) What is the formula for finding density?

b) What is the trick I taught you to remember?c) Complete the “Density of Boxes” Worksheet

Homework: “Calculating the Density of Objects” worksheet.

TODAY IN SCIENCE CLASS

1. Complete Density Two-Column Notes while reading text (alone or with partner – your choice)

2. Density PowerPoint 3. Bill Nye Boyancy Video and Worksheet4. Coke vs Diet Coke Introduction

WILT

Mrs. Dean found this cool rock. Shethinks it might be a mineral calledDolomite. Minerals all have uniquedensities, so if she calculates thedensity she will be able to know for surewhat it is. How can Mrs. Dean find

outthe density of the rock? BE VERYSPECIFIC!


FTF (Homework Out Please!)a. Please get out your 2-column notes from

yesterday!

Homework: None

TODAY IN SCIENCE CLASS1. Density PowerPoint (Blocks A,C,D) 2. Bill Nye Boyancy Video and Worksheet 3. Coke vs Diet Coke Introduction


FTF a. Pick up Coke vs Diet Coke handout

b. Complete Part I of the Coke vs Diet Coke Lab

Reminder: Test on Thursday!!

Homework: Work on study guide and STUDY!

TODAY IN SCIENCE CLASS1. Coke vs Diet Coke Lab

TODAY’S AGENDA 10/28 FTF (Turn in Skittles Lab!) WHY DOES ICE FLOAT ON WATER? Think-Pair-Share...

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