Inquiry: What is surface area and how can I change the surface area of an object? Instructions: Take...

Inquiry: What is surface area and how can I change the surface area of an object?

Instructions:Take out your: 1) lab sheet(the one that says “Score” on the

top, 2) Graph (if you completed graph) & 3) completed lab checklist

Make sure they are stapled in that order.Take out your binder.


Do Now: What is the area of this surface?Surface: the outside layer of something.

Area = base x height

6 cm.

6 cm.

Area = 6 cm. x 6 cm.

Area = 36 cm.2

How many surfaces does a cube have? 1

2

3

45

6

This shape has _______ surfaces.6


Surface

Surface

Surface

Surface

Surface

Surface

Total surface area = the sum of the areas of each of the surfaces.

6 cm.

6 cm.

Number of surfaces = ______Total surface area:Area of surface 1: _________Area of surface 2: _________Area of surface 3: _________Area of surface 4: _________Area of surface 5: _________Area of surface 6: _________

Total: _________

6

216 cm.2

36 cm.2

36 cm.2

36 cm.2

36 cm.2

36 cm.2

36 cm.2

Our cube/block has 6 surfaces. Lets split our cube/block into 2 halves.

Now what is the total amount of surfaces for both halves?

6cm

6cm

6cm

6cm

6cm3cm

6cm

6cm

3cm

How many TOTAL surfaces?__________________12 (6 for each shape)

Did cutting the block increase or decrease the TOTAL amount of surfaces? ________________________Increased from 6 to 12 surfaces.

Now what is the total surface area of both halves?

6 cm.

3 cm.

Number of surfaces = ____________Surface area of shape #1:

Area of surface 1: _________Area of surface 2: _________Area of surface 3: _________Area of surface 4: _________Area of surface 5: _________Area of surface 6: _________

Total: _________

6 cm.

36 cm.2

6 (for shape 1)

18 cm.2

18 cm.2

18 cm.2

18 cm.2

144 cm.2

Surface areaof shape #1: ___________

Surface areaof shape #2: + ___________

Total: ____________

144 cm.2

288 cm.2

36 cm.2

144 cm.2

144cm2 144cm2+

Let break our original cube into 6 pieces. How many TOTAL surfaces are there now?

6 surfaces 12 surfacesHow many total surfaces?_________________

As we break the block into more pieces the total number of surfaces ________________.increased

6 surf.

6 surf.

6 surf.

6 surf.

6 surf.

6 surf.

36 surfaces

6 surf.

6 surf.

Let break our original cube into 6 pieces. How many TOTAL surfaces are there now?

6 surfaces 12 surfaces

As we break the block into more pieces the total number of surfaces ________________.increased

6 surf.

6 surf.

6 surf.

6 surf.

6 surf.

6 surf.

36 surfaces

6 surf.

6 surf.

Now what’s the total surface area?

3 cm.6 cm.

2 cm.

Surface area of shape one:Number of surfaces = ______

Area of surface 1: _________Area of surface 2: _________Area of surface 3: _________Area of surface 4: _________Area of surface 5: _________Area of surface 6: _________

Total: _________

6

12 cm.2

12 cm.2

18 cm.2

18 cm.2

6 cm.2

6 cm.2

72 cm.2

Surface areaof shape #1: ___________

___________

Total: ____________

72 cm.2

432 cm.2

x 6 shapes

72cm2

72cm2

72cm2

72cm2

72cm2

72cm2

How did the surface area change?

Surface area: 216 cm2 Surface area: 288 cm2 Surface area: 432 cm2

As the we broke apart the cube, the number of surfaces _______________, and the total surface area_______________.

increased increased



(increases or decreases)

General Rule:Breaking or crushing an object _________________

its surface area because ______________________.

increases

It exposes more surfaces


Task: You will plan and complete your own investigation answering the question:

How does changing the surface area of an antacid pill affect how fast it reacts with water?

This lab counts as a quiz grade!Investigation Plan = 25 points (25%)

Completed lab = 50 points (50 %)Written Summary = 25 points (25%)

Inquiry: What are some different variables that affect digestion?

Record in your binder the following student observations about the digestive system (5 mins.)

- Digestion (breaking down of food) is a Chemical Change- Food travels from mouth esophagus stomachsmall intestines large intestines rectum anus

- The stomach is about the size of your fist and it is toward the upper left side of your abdomen.

- Chewing physically changes the surface area of food while enzymes (en-zeyemes) chemically changes food.

- The stomach moves/churnes while food is digesting.- Drinking warmer beverages helps digestion.

Task: This week you will choose to investigate one of the following questions:

1) How is the chemical reaction rate of an antacid pill affected by its surface area?

2) How is the chemical reaction rate of an antacid pill affected by stirring?

3) How is the chemical reaction rate of an antacid pill affected by temperature?

Research and organize some information about each variable:1) Read the section “Surface area and Chem. Changes/Reactions” use your notes and what you learned yesterday to fill in the blanks

(4 mins.)2) Read the section “Stirring area and Chem. Changes/Reactions and fill in the blank based on your prior knowledge (2mins.) 3) Read the section “Temp. area and Chem. Changes/Reactions” Observe the demo and fill in the blanks.


Task:

1) Choose a one of the three questions to investigate and write it down in your binder.

(some students may be assigned a question)You will be using an antacid pill and water to complete your

investigation

2) Complete the investigation plan on the back of your information sheet

3) Think about who you would like to work with (they must be investigating the SAME question. (Maximum of 3 per group)


L.T: I can investigate how changing the surface area of an antacid pill affects how fast it reacts with water.

Do Now: Identify the independent var., dependent var. and constants for the following question.

“How does changing the amount of clothing a person has on affect how fast they run?”

Independent variable:Dependent variable:Constants:

The amount of clothing

How fast the person is runs

The track, the distance, the contestants

Journal Entry (5 mins)1) Place the antacid pill in the cup of water

2) Record your observations3) What are the reactants?4) What are the products?

L.T.: I can complete my individual and my group Investigation Plan.

L.T.: I can complete my individual and my group Investigation Plan.

Task: A group recorder sheet will be based around.

-Find the section with your class (701 and 702 in the front of the sheet, 703 on the back of the sheet)

-In the 1st column, write the names of your group members (you name only needs to be recorded ONCE).

-Check the box that states the variable that you will be investigating.

- I will confirm whether you may investigate the question you chose.

- Complete your individual Investigation Plan (on the back of yesterday’s worksheet).

- Once each member has completed an individual plan, you will receive a Group Investigation plan. Complete your group plan.

Task: This week you will choose to investigate one of the following questions:

1) How is the chemical reaction rate of an antacid pill affected by its surface area?

2) How is the chemical reaction rate of an antacid pill affected by stirring?

3) How is the chemical reaction rate of an antacid pill affected by temperature?

Research and organize some information about each variable:1) Read the section “Surface area and Chem. Changes/Reactions” use your notes and what you learned yesterday to fill in the blanks

(4 mins.)2) Read the section “Stirring area and Chem. Changes/Reactions and fill in the blank based on your prior knowledge (2mins.) 3) Read the section “Temp. area and Chem. Changes/Reactions” Observe the demo and fill in the blanks.



Vs.

How did the surface area change?

Surface area: 216 cm2 Surface area: 288 cm2 Surface area: 432 cm2

As the number of surfaces _______________, the total surface area_______________.increased increased


How can I change the surface area of an antacid pill?


Graduated Cylinder: used to measure volume of water

Meniscus: curved water line.

Measure water at the bottom of themeniscus

L.T: I can investigate how temperature and stirring an antacid pill affects how fast it reacts with water.






Different variables that affect the rate (how fast) a chemical reaction happens:

We’ve investigated

Surface Area

Temperature

Stirring


Task: 1) Complete investigation plan for the question: “How does temperature affect how fast an antacid pill reacts

with water?”

2) Complete investigation plan for the question: “How does stirring an antacid pill affect how fast it reacts

with water?”


Task: Edit your lab-Complete materials list

- Complete your full procedure- Create a data table


Task: Edit your lab-Complete your investigation

- Complete your graph- Complete your conclusion


Task: 1) Complete investigation plan for the question: “How does temperature affect how fast an antacid pill reacts

with water?”

2) Complete investigation plan for the question: “How does stirring an antacid pill affect how fast it reacts

with water?”

Inquiry: How does surface area, temperature, and stirring affect reaction rates?






Increasing the Surface area makes chemical reactions go faster by allowing more atoms to react with each other.

Vs.

Surface area and Chemical Reactions


Surface Area

Rea

ctio

n S

peed

0 1 2 3 4


Heat makes chemical reactions go faster because there is more energy helping to create and/or break chemical bonds

Vs.

Temperature and Chemical Reactions


Temperature

Rea

ctio

n S

peed


Stirring increases the speed of a chemical reaction by adding energy to help create and/or break bonds between atoms

Vs.

Stirring and Chemical Reactions


Stirring

Rea

ctio

n S

peed


Exit Ticket: Read the article “Rate of digestion’ and answer

the questions.

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