task number: weight: due date: practical portfolio
TRANSCRIPT
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
Experiment description:
• 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
Subheading Description Your
Marks Possible Marks
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
Percentage Rank in Section Cumulative Rank:
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
Experiment description:
• 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
Subheading Description Your
Marks Possible Marks
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
Percentage Rank in Section Cumulative Rank:
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