Task Number: Weight: Due Date: Practical Portfolio

MANILLA CENTRAL SCHOOL - ASSESSMENT TASK NOTIFICATION 2021

Year 12 Chemistry Mrs A Lawrence

Task Number: 2 Notification Date: Friday 14/05/2021, Week 4 Term 2 2021 Weight: 30% Due Date: Friday 04/06/2021 3.20pm, Week 7 Term 2 2021

Practical Portfolio: Properties and Production of Alkanols

OUTCOMES ASSESSED

Working Scientifically Outcomes:

• develops and evaluates questions and hypotheses for scientific investigation CH12-1

• designs and evaluates investigations in order to obtain primary and secondary data and information CH12-2

• conducts investigations to collect valid and reliable primary and secondary data and information CH12-3

• selects and processes appropriate qualitative and quantitative data and information using a range of appropriate media CH12-4

• analyses and evaluates primary and secondary data and information CH12-5

• solves scientific problems using primary and secondary data, critical thinking skills and scientific processes CH12-6

• communicates scientific understanding using suitable language and terminology for a specific audience or purpose CH12-7

Content Outcomes: Inquiry question: How can alcohols be produced and what are their properties?

Students:

● investigate the structural formulae, properties and functional groups including:

– primary

– secondary

– tertiary alcohols

● conduct a practical investigation to measure and reliably compare the enthalpy of combustion for a range of

alcohols

● investigate the production of alcohols, including:

o fermentation

TASK DESCRIPTION

You will complete a series of in class investigations, and compile a portfolio of the experimental results and discussion analysis. There will be 3 main topics of investigation:

• Structural Isomers of Alkanols

• Heat of Combustion of Alkanols

• Monitoring Fermentation Rate Each experiment will assess your ability to complete practical methods safely, demonstrating your ability to meet Working Scientifically syllabus outcomes.

Teacher’s signature: ______________________ Mrs Ariana Lawrence Head Teacher Admin’s signature: _____________________ Ms Melissa Eagles Deputy Principal’s signature: _____________________ Mrs Rachael Ferguson

Investigation One: Structural Isomers of Alkanols Working Scientifically Focus:

› Questioning and Predicting - develops and evaluates questions and hypotheses for scientific

investigation CH12-1

o modify questions and hypotheses to reflect new evidence

› Planning Investigations: designs and evaluates investigations in order to obtain primary and

secondary data and information CH12-2

o evaluate and modify an investigation in response to new evidence

Experiment description:

• Complete the investigation according to the method provided.

• Answer discussion questions and draw reliable conclusion regarding the use of this method as an indicative test for Isomers of Alkanols

Marking Criteria: #1 Structural Isomers of Alkanols

Subheading Description Your

Marks Possible Marks

Risk Assessment

Provides 2 identified risks and appropriate precautions

2

Results Tabulated record of appropriate measurements taken during the practical task, including quantitative and qualitative results

5

Discussion

1. Provides balanced redox half equations for positive reactions (colour changes)

2

2. Provides balanced chemical equations for positive reactions (colour changes)

1

3. Justified decision of use of tests for identification of isomers

2

4. Suggests a valid method for the use of carbonate ions for isomer identification

2

4a. Provides structural equations for carbonate reaction with alcohol isomers

2

4b. Suggests TWO logical problems with carbonate test

2

Conclusion Provides a justified assessment of dichromate ions as an identification tool for isomers of alkanols

2

Feedback:

Mrs Lawrence ☺

20

Percentage Rank in Section Cumulative Rank:

Investigation One: Heat of Combustion of Alkanols Working Scientifically Focus:

› Questioning and Predicting - develops and evaluates questions and hypotheses for scientific

investigation CH12-1

o modify questions and hypotheses to reflect new evidence

› Planning Investigations: designs and evaluates investigations in order to obtain primary and

secondary data and information CH12-2

o evaluate and modify an investigation in response to new evidence


• Plan and conduct the investigation according to the guidelines provided

• Additional copy of this experiment is on pg 111-112 in your Module 7 workbook

Marking Criteria: #2 Heat of Combustion of Alkanols



Equipment Order

All items required for the experimental method are ordered punctually

2

Risk Assessment

Provides 4 identified risks and appropriate precautions

4

Aim Appropriate aim for investigation linking independent and dependent variables

2

Hypothesis Provides a justified and educated prediction of the composition of the beach sand

1

Materials All equipment required for method is listed 2

Method

Considers the reduction of environmental loss of heat 1

Controls variables to ensure a valid comparison of fuels 2

Includes steps to ensure reliability of data collected 2

Results

Tabulated record of appropriate RAW measurements taken during the practical task, including:

• initial weight, final weight and mass of fuel burnt

• heat absorbed by calorimeter

• heat of combustion per gram of each fuel

• molar heat of combustion for each fuel

12

Summarises experimental data in separate table (step 4&5) including, calculated raw data, standard values and % efficiency of fuel

9

Discussion

1. Justifies deviation of experimental values against literature values

1

2. Extrapolates graphed data and predicts next alkanol value

3

3. Assesses reliability of the data collected and suggests improvements

2

4. Assesses accuracy of the data and collected and suggests improvements

2

Conclusion Provides a valid conclusion that summarises the trend in molar heats of combustion within the alkanol homologous series

1

Feedback:

Mrs Lawrence ☺

50


Investigation Three: Monitoring Fermentation Working Scientifically Focus:

› Analysing Data and Information – analyses and evaluates primary and secondary data and

information CH12-5

o derive trends, patterns and relationships in data and information

o assess error, uncertainty and limitations in data

o assess the relevance, accuracy, validity and reliability of primary and secondary data and

suggest improvements to investigations

› Processing Data and Information - selects and processes appropriate qualitative and quantitative data and information using a range of appropriate media CH12-4

o select qualitative and quantitative data and information and represent them using a range

of formats, digital technologies and appropriate media

o apply quantitative processes where appropriate

o evaluate and improve the quality of data


• Research background information about the basic requirements of yeast to ferment glucose, including providing balanced equations and Standard Enthalpy values.

• Complete the investigation according to the method provided.

• Test the reliability of your results by comparing them to those obtained using an alternate experimental method

• Answer discussion questions and draw a reliable conclusion

Marking Criteria: #3 Monitoring Fermentation



Background Research

Correctly identifies optimal conditions for yeast to ferment sugars

1

Indicates end percentage ethanol obtained by fermentation

1

Provides balanced word and chemical equations for the fermentation of glucose and sucrose sugar samples

2

Provides Standard Enthalpy Values for the fermentation of glucose and sucrose

1

Results

Tabulated record of appropriate measurements taken during the practical task

1

Data is graphed and trend is summarized

1

Discussion Questions

(from worksheet)

1. Outlines the purpose of glucose in the experiment

1

2. Summaries the trend in balloon circumference

1

3. Explains observed changes in balloon circumference

1

4. Identifies respiration types in graphed data

1

5. Accurately devises method for limewater test for CO2, describing positive result

2

6. Describes TWO limitations in accuracy and suggests appropriate improvements

2

Calculations

Calculates the theoretical yield of CO2 from the sample of glucose in moles

2

Calculates the experimental moles of CO2 actually produced using the circumference of the balloon to calculate the volume of a sphere (assume 25°C)

4

Calculates the percentage yield of the fermentation reaction

2

7. Revised Procedure

Risk assessment provides 2 identified risks and appropriate precautions

2

Method controls variables to ensure a valid test and includes a control apparatus

1

Method includes steps to ensure reliability of data collected

1

Justifies method’s increased accuracy

2

Conclusion Summarises the trend in the fermentation of glucose, including plateau of trend line in relation to progress of yeast reaction

1

Feedback:

Mrs Lawrence ☺

30


MARKING SUMMARY

Section 1: Structural Isomers of Alkanols

Section 2: Heat of Combustion of Alkanols

Section 3: Monitoring Fermentation

OVERALL MARKS

Percentage Rank in Task: Cumulative Rank:

Equipment Order Form

Student Name: _____________________________ Student Number: _________________________

Equipment Required:

Description Quantity

Risk Assessment: Risks Precaution/Minimisation Strategy

Documents

Task Number: Weight: Due Date: Practical Portfolio