LEARN NC

K–12 teaching and learning · from the UNC School of Education

About this resource

Appropriate grades
9–12
Subjects
science (chemistry, environmental science)
Provider
American Association for the Advancement of Science

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In this second lesson of a three-part series on toxicology, students conduct a toxicology experiment on the Brassica rapa plant. The purpose of this lesson is to explore how the disposal of chemicals found in common household products contaminates the earth’s soil, water and air. This lesson is an experimental hands-on activity in which students determine the toxic dose of a chemical that will inhibit seed germination in Brassica rapa, a relative of cabbages and mustards. Neither the teacher nor the students are provided with a set procedure to conduct the investigation. Rather, the lesson provides a set of guidelines forcing students to brainstorm ideas, contribute their thoughts, and determine through dialogue with their peers how a hypothesis can be tested. Thus, through this activity, students will gain an understanding of toxicology as well as the basic principles of “doing.” Science NetLinks provides the necessary student and teacher handouts, links to notes that may help with the creation of an appropriate experiment, and detailed questions to guide the teacher and students through the process of scientific inquiry.

North Carolina Curriculum Alignment

Science (2005)

Grades 9–12 — Advanced Placement Chemistry

  • Goal 1: The learner will develop abilities necessary to do and understand scientific inquiry.
    • Objective 1.01: Design, conduct and analyze investigations to answer questions related to chemistry:
      • Identify questions and suggest hypotheses.
      • Identify variables.
      • Use a control when appropriate.
      • Select and use appropriate measurement tools.
      • Collect and organize data in tables, charts and graphs.
      • Analyze and interpret data.
      • Explain observations.
      • Make inferences and predictions.
      • Explain the relationship between evidence and explanation.
      • Identify how scientists share findings.
    • Objective 1.02: Analyze reports of scientific investigations.
      • Appropriate sample.
      • Adequacy of experimental controls.
      • Replication of findings.
      • Consideration of alternative interpretations of the data.
    • Objective 1.03: Analyze experimental designs with regard to safety.
      • Identify potential safety hazards given a scenario.
      • Differentiate between safe and unsafe procedures.
      • Use information from the MSDS (Material Safety Data Sheets) to assess chemical hazards.
  • Goal 4: The learner will develop an understanding of chemical reactions.
    • Objective 4.01: Analyze the various types of common chemical reactions
      • Acid-base reactions; concepts of Arrhenius, Brönsted-Lowry, and Lewis;
      • Coordination complexes; amphoterism.
      • Precipitation reactions.
      • Oxidation-reduction reactions.
        • Oxidation number.
        • The role of the electron in oxidation-reduction.
        • Electrochemistry: electrolytic and galvanic cells; Faraday's laws; standard half-cell potentials; Nernst equation; prediction of the direction of redox reactions.
    • Objective 4.05: Analyze chemical thermodynamics
      • State functions.
      • First law: change in enthalpy; heat of formation; heat of reaction; Hess's law; heats of vaporization and fusion; calorimetry.
      • Second law: entropy; free energy of formation; free energy of reaction; dependence of change in free energy on enthalpy and entropy changes.
      • Relationship of change in free energy to equilibrium constants and electrode potentials.
  • Goal 5: The learner will build a knowledge of descriptive chemistry.
    • Objective 5.01: Examine chemical reactivity and predict the products of chemical reactions.

Grades 9–12 — Advanced Placement Earth and Environmental Science

  • Goal 5: The learner will build an understanding of air, water and soil quality.
    • Objective 5.01: Analyze the sources of major pollutants.
      • EPA Criteria Pollutants.
      • Indoor air pollutants.
      • Thermal pollution.
      • Pesticides.
      • Acid deposition.
      • Units and measurements.
      • Point and nonpoint sources.
    • Objective 5.02: Investigate the effects of pollutants on:
      • Aquatic systems (Eutrophication).
      • Vegetation.
      • Natural features, buildings and structures.
      • Wildlife.
    • Objective 5.03: Analyze and investigate pollution reduction, remediation and control measures.
      • Legislation.
      • Historical examples and global case studies.
      • Waste water treatment plant.
    • Objective 5.04: Analyze and investigate local, regional and global issues concerning solid waste.
      • Types, sources and amounts.
      • Disposal methods and environmental effects.
      • Decreasing waste: Reduce, reuse, recycle.
    • Objective 5.05: Analyze impacts on human health.
      • Infectious disease.
      • Chemical agents.
      • Radiation.
      • Toxicology: LD50, acute and chronic effects.
      • Risk assessment.

Grades 9–12 — Chemistry

  • Goal 1: The learner will develop abilities necessary to do and understand scientific inquiry.
    • Objective 1.01: Design, conduct and analyze investigations to answer questions related to chemistry.
      • Identify questions and suggest hypotheses.
      • Identify variables.
      • Use a control when appropriate.
      • Select and use appropriate measurement tools.
      • Collect and organize data in tables, charts and graphs.
      • Analyze and interpret data.
      • Explain observations.
      • Make inferences and predictions.
      • Explain the relationship between evidence and explanation.
      • Identify how scientists share findings.
    • Objective 1.02: Analyze reports of scientific investigations from an informed scientifically-literate viewpoint including considerations of:
      • Appropriate sample.
      • Adequacy of experimental controls.
      • Replication of findings.
      • Alternative interpretations of the data.
    • Objective 1.03: Analyze experimental designs with regard to safety and use safe procedures in laboratory investigations:
      • Identify and avoid potential safety hazards given a scenario.
      • Differentiate between safe and unsafe procedures.
      • Use information from the MSDS (Material Safety Data Sheets) to assess chemical hazards.
  • Goal 5: The learner will develop an understanding of chemical reactions.
    • Objective 5.01: Evaluate various types of chemical reactions:
      • Analyze reactions by types: single replacement, double replacement (including acid-base neutralization) , decomposition, synthesis, and combustion including simple hydrocarbons.
      • Predict products.
    • Objective 5.06: Assess the factors that affect the rates of chemical reactions.
      • The nature of the reactants.
      • Temperature.
      • Concentration.
      • Surface area.
      • Catalyst.