Loading...

Messages

Proposals

Stuck in your homework and missing deadline? Get urgent help in $10/Page with 24 hours deadline

Get Urgent Writing Help In Your Essays, Assignments, Homeworks, Dissertation, Thesis Or Coursework & Achieve A+ Grades.

Privacy Guaranteed - 100% Plagiarism Free Writing - Free Turnitin Report - Professional And Experienced Writers - 24/7 Online Support

Chemical changes gizmo answer key activity a

12/11/2021 Client: muhammad11 Deadline: 2 Day

Name: ______________________________________ Date: ________________________

Student Exploration: Collision Theory

Vocabulary: activated complex, catalyst, chemical reaction, concentration, enzyme, half-life, molecule, product, reactant, surface area

Prior Knowledge Questions (Do these BEFORE using the Gizmo.)

1. Suppose you added a spoonful of sugar to hot water and another to ice-cold water. Which type of water will cause the sugar to dissolve more quickly? Hot water

2. Suppose you held a lighted match to a solid hunk of wood and another match to a pile of wood shavings. Which form of wood will catch fire more easily? ______________________

image9.jpg

Gizmo Warm-up

A chemical reaction causes the chemical compositions of substances to change. Reactants are substances that enter into a reaction, and products are substances produced by the reaction. The Collision Theory Gizmo™ allows you to experiment with several factors that affect the rate at which reactants are transformed into products in a chemical reaction.

You will need blue, green, and orange markers or colored pencils for the first part of this activity.

1. Look at the key at the bottom of the SIMULATION pane. In the space below, draw the two reactants and two products of this chemical reaction.

image10.pngReactants: Products:

2. Click Play (image11.png). What do you see? ____________________________________________

_________________________________________________________________________

_________________________________________________________________________

_________________________________________________________________________

Activity A:

Temperature

Get the Gizmo ready:

· Click Reset (image2.jpg).

· Check that the Reactant concentration is set to 1.0 mol/L, the Catalyst concentration is set to 0.00 mol/L, and the Surface area is Minimum.

image3.jpg

Question: How does temperature affect the rate of a chemical reaction?

1. Observe: Select the ANIMATION tab. View the animation with No catalyst selected.

What do you see? __________________________________________________________

_________________________________________________________________________

_________________________________________________________________________

When two reactant molecules meet, they form a temporary structure called an activated complex. The activated complex breaks up into the product molecules.

2. Observe: Return to the CONTROLS pane. Set the Temperature to 0 °C and the Simulation speed to its maximum setting. Click Play.

A. Describe the motions of the molecules. ____________________________________

___________________________________________________________________

B. Now set the Temperature to 200 °C. How does increasing the temperature affect the motions of the molecules? ___________________________________________

C. What do you notice about the chemical reaction at the higher temperature? _______

___________________________________________________________________

3. Interpret: Select the GRAPH tab. Click the zoom out button (image4.jpg) until you can see the whole graph. What does this graph show? ____________________________________________

_________________________________________________________________________

4. Predict: How do you think temperature will affect the rate of a chemical reaction? ________

_________________________________________________________________________

_________________________________________________________________________

(Activity A continued on next page)

Activity A (continued from previous page)

5. Gather data: Click Reset. A useful way to compare reaction rates is to record the time required for half of the reactants to react, called the half-life of the reaction. With the Temperature set to 200 °C, click Play. Click Pause (image5.jpg) when the number of reactant molecules is 10. Record the half-life time in the first space of the table below.

Trial

200 °C

150 °C

100 °C

50 °C

1

2

Mean half-life

Repeat the experiment at different temperatures to complete the table. (Note: To get exact times, you can refer to the TABLE tab.)

6. Calculate: Calculate the mean half-life for each temperature. Fill in these values above.

(Hint: To get an exact mean, first convert each time to seconds by multiplying the minutes value by 60 and adding this to the seconds. To find the mean in seconds, add up the two times and divide by two. Convert the answer back to minutes and seconds.)

7. Analyze: What do your results indicate? _________________________________________

_________________________________________________________________________

_________________________________________________________________________

8. Draw conclusions: For two molecules to react, they must collide at just the right angle and with enough energy to break the original bonds and form new ones. Based on these facts, why does the reaction tend to go more quickly at higher temperatures?

_________________________________________________________________________

_________________________________________________________________________

9. Apply: Paper must be heated to 234 °C to begin reacting with oxygen. This can be done by putting the paper over a flame. Why do you think the paper must be heated to start burning?

_________________________________________________________________________

_________________________________________________________________________

_________________________________________________________________________

Activity B:

Surface area and concentration

Get the Gizmo ready:

· Click Reset.

· Check that the Catalyst concentration is set to 0.00 mol/L and the Surface area is Minimum.

· Set the Temperature to 200 °C.

image6.jpg

Introduction: Reaction rates are also influenced by surface area and concentration. The surface area of a solid is a measure of how much of the solid is exposed to other substances. The concentration of a substance is a measure of how many molecules of that substance are present in a given volume.

Question: How do surface area and concentration affect reaction rates?

1. Observe: Change the Surface area from Minimum to Maximum. How does this change the amount of Reactant B molecules that are exposed to Reactant A?

_________________________________________________________________________

2. Predict: How do you think increasing the surface area will affect the rate of the reaction?

The rate of reaction increases as there are more areas to react with- imagine a perfect ice sculpter and an ice sculpter that smashed, the smashed one will melt faster as there is more heat reaching more if the sculpter

3. Gather data: Set the Reactant concentration to 2.0 mol/L. Use the Gizmo to measure the half-life of the reaction for each surface area setting. (There will now be 20 reactant molecules left at the half-life.) Then, calculate the mean half-life for each setting.

Trial

Minimum surface area

Maximum surface area

1

2

Mean half-life

4. Analyze: What do your results indicate? _________________________________________

_________________________________________________________________________

5. Explain: Why does the reaction proceed more quickly when the surface area is increased?

_________________________________________________________________________

_________________________________________________________________________

_________________________________________________________________________

(Activity B continued on next page)Activity B (continued from previous page)

6. Observe: Click Reset. Move the Reactant concentration slider back and forth. What do you notice?

_________________________________________________________________________

7. Predict: How will increasing the reactant concentration affect the rate of the reaction? Why?

_________________________________________________________________________

_________________________________________________________________________

8. Gather data: Make sure the Temperature is 200 °C and the Surface area is Maximum. Use the Gizmo to measure the half-life for each given reactant concentration. (Note that the number of reactant molecules changes with each concentration.) Calculate the means.

Trial

0.4 mol/L

0.8 mol/L

1.2 mol/L

1.6 mol/L

2.0 mol/L

1

2

Mean half-life

9. Compare: If possible, find the mean times for each concentration for your entire class. What is the mean class time for a concentration of 0.4 mol/L? How about for 2.0 mol/L?

Mean for 0.4 mol/L: ______________ Mean for 2.0 mol/L: ______________

10. Analyze: What do these results indicate? ________________________________________

_________________________________________________________________________

_________________________________________________________________________

11. Apply: Hydrochloric acid reacts with the mineral calcite to produce carbon dioxide gas, water, and calcium chloride. Based on what you have learned in activity A and activity B, what are three things you could do to make the reaction occur more quickly?

_________________________________________________________________________

_________________________________________________________________________

_________________________________________________________________________

Activity C:

Catalysts

Get the Gizmo ready:

· Click Reset (image7.jpg).

image8.jpg

Introduction: A catalyst is a substance that helps a chemical reaction to proceed. The catalyst molecules are not changed by the reaction and can be reused over and over again.

Question: How do catalysts affect the rate of a chemical reaction?

1. Observe: Select the ANIMATION tab. Select With catalyst, and observe.

A. What do you see? ____________________________________________________

___________________________________________________________________

B. Why do you think the shape of a catalyst is important? _______________________

___________________________________________________________________

___________________________________________________________________

Many catalysts have a special shape that allows them to bind to specific reactant molecules.

2. Predict: How do you think catalysts will affect the rate of a chemical reaction? ___________

_________________________________________________________________________

3. Gather data: On the CONTROLS pane, set the Reactant concentration to 2.0 mol/L, the Surface area to Maximum, and the Temperature to 50 °C. Measure the half-life for each given catalyst concentration. Calculate the means.

Trial

Catalyst concentration

0.00 mol/L

0.05 mol/L

0.10 mol/L

0.15 mol/L

1

2

Mean half-life

4. Analyze: What do your results indicate? _________________________________________

_________________________________________________________________________

_________________________________________________________________________

(Activity C continued on next page)

Activity C (continued from previous page)

5. Explore: Set the Catalyst concentration to 0.00 mol/L and the Temperature to 0 °C. Click Play, wait for 10 minutes of simulated time, and click Pause.

A. What happens? ______________________________________________________

B. Click Reset, set the Catalyst concentration to 0.25 mol/L, and click Play. After 10 simulated minutes, click Pause. What happens now? ________________________

___________________________________________________________________

C. Why do you think the catalysts allowed the chemical reaction to take place at 0 °C?

When reactants are joined by a catalyst, they no longer have to collide with much energy to react. Thus, with the catalyst present the reaction can proceed at very low temperatures.

6. Draw conclusions: What is the usefulness of catalysts? _____________________________

_________________________________________________________________________

_________________________________________________________________________

7. Apply: Most of the chemical reactions inside your body rely on protein catalysts called enzymes to take place. For example, the enzyme pepsin helps to break down protein molecules in your stomach. What might happen if your stomach stopped producing pepsin?

_________________________________________________________________________

_________________________________________________________________________

_________________________________________________________________________

Homework is Completed By:

Writer Writer Name Amount Client Comments & Rating
Instant Homework Helper

ONLINE

Instant Homework Helper

$36

She helped me in last minute in a very reasonable price. She is a lifesaver, I got A+ grade in my homework, I will surely hire her again for my next assignments, Thumbs Up!

Order & Get This Solution Within 3 Hours in $25/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 3 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

Order & Get This Solution Within 6 Hours in $20/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 6 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

Order & Get This Solution Within 12 Hours in $15/Page

Custom Original Solution And Get A+ Grades

  • 100% Plagiarism Free
  • Proper APA/MLA/Harvard Referencing
  • Delivery in 12 Hours After Placing Order
  • Free Turnitin Report
  • Unlimited Revisions
  • Privacy Guaranteed

6 writers have sent their proposals to do this homework:

Buy Coursework Help
Financial Hub
Helping Engineer
George M.
Assignment Helper
Custom Coursework Service
Writer Writer Name Offer Chat
Buy Coursework Help

ONLINE

Buy Coursework Help

I am an academic and research writer with having an MBA degree in business and finance. I have written many business reports on several topics and am well aware of all academic referencing styles.

$40 Chat With Writer
Financial Hub

ONLINE

Financial Hub

I will provide you with the well organized and well research papers from different primary and secondary sources will write the content that will support your points.

$40 Chat With Writer
Helping Engineer

ONLINE

Helping Engineer

I reckon that I can perfectly carry this project for you! I am a research writer and have been writing academic papers, business reports, plans, literature review, reports and others for the past 1 decade.

$28 Chat With Writer
George M.

ONLINE

George M.

I will provide you with the well organized and well research papers from different primary and secondary sources will write the content that will support your points.

$37 Chat With Writer
Assignment Helper

ONLINE

Assignment Helper

I am a PhD writer with 10 years of experience. I will be delivering high-quality, plagiarism-free work to you in the minimum amount of time. Waiting for your message.

$30 Chat With Writer
Custom Coursework Service

ONLINE

Custom Coursework Service

I reckon that I can perfectly carry this project for you! I am a research writer and have been writing academic papers, business reports, plans, literature review, reports and others for the past 1 decade.

$24 Chat With Writer

Let our expert academic writers to help you in achieving a+ grades in your homework, assignment, quiz or exam.

Similar Homework Questions

Http att com 3gmicrocell activate - I need to complete my assinments for cert iv in disablity - Principal component analysis python pandas - Surry hills parking permit - Xantrex 1800 inverter troubleshooting - How to create your own civilization - 4 types of pathogens - Hh - Unit 8 Assignment - How to cite a 10k report apa - How much per page / 275 words, i have couple of papers to work - APPLICATION OF HEALTH CARE INFORMATION SYSTEMS - Professional roles and values - Customer satisfaction - Compensation and Benefits - Mater hill car park - Comparative essay outline example - Eric helms training program - What's on melbourne tv tonight - Manifest destiny - Game of thrones hoodie south africa - PM - Shirlaw v southern foundries - Beeler furniture company bank reconciliation june 30 20y2 - Trek company has the following production - Creative middle way solutions - Mass of lithium in amu - Project Management- Reflection & Discussion- Week 15 - 4 levels 6 stages tcm - Shadow health musculoskeletal - Crisis intervention strategies 8th edition ebook - Iec 60034 6 method of cooling - How formidable a competitor is google for amazon - Saudi arabia hdi rank - Meaning of name kaylani - Functionalism conflict theory and symbolic interactionism - Wombat goes walkabout teaching ideas - Iso 6336 gear standard - Interaction design 5th edition pdf - Chemical equation for iron - Microeconomics karlan morduch answers - Prospectus Extraction - Historical lenses - Mid semester break monash - Wk 2 - Market Segmentation and Buyer Behavior Presentation - DQ w5 635 - Idiot nation michael moore analysis - Bangladesh india professional skill development institute - Research paper - My Theory of Classroom Management - Cross Functional Essay - Topic: Energy Budget and Habitability (CIP3) - Assignment - Harry potter lesson plan pdf - Write a 2- to 3-page memo to the Chief Executive Officer (CEO) of the Vampire Legends organization to: - Analog devices chelmsford ma - E-waste - Healthcare Environment;Review of Current Healthcare Issues AND Analysis of a Pertinent Healthcare Issue - Short run and long run expansion path - Assignment assessing a healthcare program policy evaluation - New Works 08/19 - In diverse cultures and ses groups, insecurely attached infants tend to have mothers who - Bus.com 1 - Penn foster practical english lesson 4 exam answers - Discussion 150 words - How to draw a cube on paper - Year 1 ict curriculum - Trouble in the truss construction shop critical thinking - Grow back receding gums naturally - Newham council free parking permits - Given the business rule an employee may have many degrees - 20 2 yarn definition - Christchurch hospital x ray department - What is ch2oh in biology - Shon harris cause of death - Acs national average score - Claude cahun cause of death - Power Point - Michaelis menten curve fitting - 12.36 divided by 6 - L houts plastics is a large manufacturer - Yamile marrero fiu - GOAL Setting - Qualitative analysis of group 1 cations conclusion - Twisted pair cable types and uses - Don t tell em fortune remix - Tafe sa website down - Differences and similarities between the three forms of nursing inquiry: quality improvement (QI), research, and evidence-based practice (EBP). - Push pull profile strategies marketing communications - Magnesium and hydrochloric acid reaction - Issue Review - Telephone area code 243 - Discussion - Alliteration for falling leaves - Lyrics firework katy perry meaning - Platinum 194 superscripts and subscripts - Map of wave rock - Key concepts of cognitive psychology - Glaxosmithkline in china case study analysis - Bad ideas about writing summary