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Year 11: Chemistry

Activity name: Presenting and analysing data/information from a first-hand investigation

Grade Student work samples
Grade A Kim
Grade B Raja
Grade C Mel
Grade D Carson Aden
Grade E No samples

Description of activity

In this assessment activity you are to follow the planned procedure to conduct a first-hand investigation in which you will construct models to show the structure of molecules of alkanes and alkenes containing four carbon atoms. Draw a labelled outline diagram of each of your models and name each compound using correct IUPAC nomenclature. When you have completed your labelled drawings raise your hand for the teacher to check your work.

Based on your observations of the models and the information provided in Table 1, identify the correct boiling point of each molecule. Justify your conclusions.

Table 1: Properties of some organic compounds
BP oC Molecule
-10.55 A
-0.55 B
-6.47 C
3.7 D
0.9 E

Context

Students have been studying module 8.5 Energy of the Preliminary Chemistry course and have investigated the structure of a range of straight-chain carbon compounds and how some are extracted from organic sources by fractional distillation. They have related the boiling point, melting point and volatility of straight-chain alkanes and alkenes to their non-polar nature and intermolecular forces.

Students have used molecular model kits to make models of alkanes and alkenes containing four carbon atoms. With teacher guidance, if appropriate, they identify any isomers they make (eg methyl propane, cis-/trans-2-butene).

Teacher information only
Hydrocarbon BP oC Molecule
butane -10.55 A
methyl propane -0.55 B
butene-1 -6.47 C
2-butene (cis)* 3.7 D
2-butene (trans)* 0.9 E
*Distinguish with teacher guidance as appropriate

Area(s) of learning

Knowledge and understanding of:

  • the nature and practice of chemistry
  • carbon chemistry

Skills in:

  • conducting investigations
  • communicating information and understanding
  • developing scientific thinking and problem-solving techniques

Outcomes

A student:

  • P2 applies the processes that are used to test and validate models, theories and laws of science with particular emphasis on first-hand investigations in chemistry
  • P12 discusses the validity and reliability of gathered data from first-hand investigations and secondary sources
  • P13 identifies appropriate terminology and reporting styles to communicate information and understanding
  • P14 draws valid conclusions from gathered data and information

Criteria for assessing learning

(These criteria would normally be communicated to students with the activity.)

Students will be assessed on their ability to:

  • follow the planned procedures to gather first-hand data/information
  • draw clearly labelled outline diagrams, using an appropriate scale and scientific language
  • use correct IUPAC naming for each compound
  • justify conclusions.
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