A student investigates the effect of different alkyl halides on the rate of an SN1 reaction with ethanol. They use three different alkyl halides: 2-chloro-2-methylpropane, 2-chlorobutane, and 1-chlorobutane. After collecting the data, the student plots the reaction rate against the concentration of each alkyl halide used. Which of the following statements best describes a valid method for evaluating the data to identify patterns and relationships?
Calculate the average reaction rate for each alkyl halide across all concentrations and compare these averages to determine the relative reactivity.
Compare the initial concentrations of the alkyl halides to the final concentrations of the products, and assume the alkyl halide with the greatest difference reacted the fastest.
Examine the colour of the solution after the reaction and qualitatively assess the relative reaction rates based on the intensity of the colour change.
Determine the standard deviation of the concentrations and use it as a measure of the reliability of the experiment.
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Create Free Account Log inThis is a free VCE Units 3 & 4 Chemistry practice question worth 1 mark, testing your understanding of Data evaluation. It falls under Student-designed scientific investigation in Unit 4: How are carbon-based compounds designed for purpose?. Submit your answer above to receive instant AI-powered marking and personalised feedback.
Carbon is the basis not only of the structure of living tissues but is also found in fuels, foods, medicines, polymers and many other materials that we use in everyday life. In this unit students investigate the structures and reactions of carbon-based organic compounds, including considering how green chemistry principles are applied in the production of synthetic organic compounds. They study the metabolism of food and the action of medicines in the body. They explore how laboratory analysis and various instrumentation techniques can be applied to analyse organic compounds in order to identify them and to ensure product purity. Students conduct practical investigations related to the synthesis and analysis of organic compounds, involving reaction pathways, organic synthesis, identification of functional groups, direct redox titrations, solvent extraction and distillations. Throughout the unit students use chemistry terminology including symbols, formulas, chemical nomenclature and equations to represent and explain observations and data from their own investigations and to evaluate the chemistry-based claims of others. A student-designed scientific investigation involving the generation of primary data related to the production of energy and/or chemicals and/or the analysis or synthesis of organic compounds is undertaken in either Unit 3 or Unit 4, or across both Units 3 and 4, and is assessed in Unit 4 Outcome 3. The design, analysis and findings of the investigation are presented in a scientific poster format. School-based assessment The student’s level of achievement in Unit 4 will be determined by School-assessed Coursework, which contributes 30 per cent to the study score. Students complete a set of tasks to address Outcomes 1 and 2, and design and conduct a student investigation for Outcome 3. External assessment The level of achievement for Units 3 and 4 is also assessed by an end-of-year examination contributing 50 per cent to the study score.
Students undertake a student-designed scientific investigation in either Unit 3 or Unit 4, or across both Units 3 and 4. The investigation involves the generation of primary data related to the production of energy and/or chemicals and/or the analysis or synthesis of organic compounds. The design, analysis and findings are presented in a scientific poster. Outcome 3 On completion of this unit the student should be able to design and conduct a scientific investigation related to the production of energy and/or chemicals and/or the analysis or synthesis of organic compounds, and present an aim, methodology and method, results, discussion and conclusion in a scientific poster. Key knowledge
ways of organising, analysing and evaluating primary data to identify patterns and relationships
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