Catalyst

Catalyst

• Look over your learning logs• What are the three learning targets that you

think will be the hardest for you? Copy them down.

• Why do you think that?

End

Top Achievers (>80%)Period 1

Ana Hidalgo

Sindi Vazquez

Trent Nettles

Martha Nochez

Jonathan Flores

Daisy Benitez

Giorgi Trujillo

Alexis Valle

Eric Cano


Henry Rodriguez

Luis Garcia

Maria Servera


Camden Tillman


Ricardo Interiano

Mike Davalos

Breidy Rodriguez

Melissa Rodriguez


Noe Bonfil

Armando Raya

Genesis Acajabon

Biggest Growth (>15% Growth)Period 3

Jasmine Dillard

Camden Tillman

Leslie Diaz

Jesus Rubio


Ilynn Perez

Giorgi Trujillo

Josue Bravo


Maria Servera


Melissa Rodriguez

Elizabeth Ayala


Genesis Acajabon

Leslie Martinez

Valencia Alamilla

Marlene De La Torre

Monae Warthen

Mysty Carpenter

Rashaun Hicks

McDonald’s French Fries Reading

• Read the article with your group.• Answer the questions and be prepared to

discuss with the class.

Reading Debrief• What is decomposition?• Why don’t McDonalds fries or burgers decompose?• How can we slow the rate at which something

decomposes?• Should we be adding chemicals to our foods in order

to preserve them?• What other questions did you have during this

reading?

Catalyst• What is decomposition?• Why don’t McDonalds fries or burgers

decompose?• How can we slow the rate at which something

decomposes?• Should we be adding chemicals to our foods in

order to preserve them?

End

Unit 8 – What is McDonald’s Putting In Its French Fries?

ACS Chemistry Olympiad

• Old Tests!• Let me get somma dat!• Mr. Astor’s File Cabinet –

Week of March 3, 2014

LECTURE 8.1 – FACTORS ON RATE OF REACTION

Today’s Learning Target• LT 8.1 – I can describe the rate of a reaction using the ideas of

concentration of reactants, concentration of products, and time. I can explain why rate is dependent on concentration.

• LT 8.2 – I can calculate the average rate of reaction with respect to the reactants and/or products.

• LT 8.3 – I can hypothesize about the impact that concentration, temperature, and pressure have on the rate of a chemical reaction.

Today’s Focus Question

• What is the typical rate at which food decomposes?

How are rates measured?

I. Rate of Reaction• A rate describes how fast something changes

with time.• Rate is measured either by the rate of

formation of product or the rate of disappearance of the reactants.

How is collision theory related to rates?

I. Collision Theory• Reactions occur when molecules collide.• Therefore, more collisions, a faster overall rate of

reaction. Less collisions, a slower rate.

SUMMARIZE

Use the following terms:• Rates• Collision• Formation• Disappearance

What are ways to impact the rate of reaction?

I. Concentration, Temperature, Pressure, and Rate

• As concentration , the rate also increases

• As temperature , the rate also increases.

• As pressure , the rate also increases.

• This is due to the increased amount of collisions

What determines the rate of a reaction?

I. Concentration and Rate• As you increase the concentration, the rate of

reaction increases.• The higher the concentration the more

collisions that are occurring, which increases the rate.

II. Temperature and Rate• As you heat up

molecules they begin to move faster.

• The faster molecules move the more they collide, which means a faster rate.

III. Pressure and Rate• As you increase the pressure molecules collide

more into the wall of the container and into each other.

• Therefore, as you increase pressure, you increase the rate of the reaction.

Summarize

Use the following words:• Pressure• Temperature• Concentration• Rate• Collisions

White Board QuestionsH2 + Cl2 2HCl

• The rate can be described as the decrease of _____ with time

H2 + O2 H2O• The rate can be described as the increase of

_____ with timeNaOH + HCl H2O + NaCl

• The rate can be described as the decrease of _______ with time

White Board QuestionsH2 + Cl2 2HCl

• If I increase the concentration of H2, how will the rate change?

• If I decrease the pressure, how will the rate change?

• I heat the container, how will the rate be changed?

• I decrease the amount of Cl2, how will the rate change?

White Board Questions

C6H6 + Br2 C6H5Br + HBr

• Which of the following changes will cause an increase in the rate of the above reaction?A. Increasing the concentration of Br2

B. Decreasing the concentration of C6H6.

C. Increasing the concentration of HBrD. Decreasing the temperature

White Board Questions• I run the reaction:

C6H12O6 + 6 O2 6 CO2 + 6 H2O

• If I begin with 0.25 M O2 and after 100 seconds the concentration is 0.12 M, then what is the rate of this reaction?

• I run the same reaction and I begin with 0 M CO2 and after 232 seconds the concentration of CO2 is 0.75 M.

Lab – Alka Seltzer Rockets

• Read and annotate the procedure for the lab

Lab Logistics• You will be working in groups of 4• Decide who will take on each role, or let one person

do all of the items below:(1) Dropper and Capper (drops in tablet, caps it, and turns it upside down)(2) Filmer(3) Cup Placer (places cup over test tube)(4) Timer/measurer

Lab Demonstration

Expectations• Explain the influence of

(1) concentration and (2) temperature influence the rate of a reaction of Alka Seltzer.

• You will turn in 1 COPY PER GROUP of your findings and post-lab questions at the end of class.

Lab Work Time

Post-Lab Analysis

Exit Ticket

1. If you increase the pressure of a container, how is the rate of the reaction impacted?

2. What is collision theory and how is it related to rates?

3. I run the reaction:C6H12O6 + 6 O2 6 CO2 + 6 H2O

If I begin with 0.25 M O2 and after 100 seconds the concentration is 0.12 M, then what is the rate of this reaction?

College-Ready Question:

2CO + O2 2CO2 If the above reaction takes place inside a sealed reaction chamber, then which of these procedures will cause a decrease in the rate of reaction?

A raising the temperature of the reaction chamber

B increasing the volume inside the reaction chamber

C removing the CO2 as it is formed

D adding more CO to the reaction chamber

Closing Time

• Turn in the lab questions as you leave.• Work on your lab report!

Catalyst

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Transcript of Catalyst