Amines Chemistry

Overview

This lesson introduces amines as an organic chemistry functional group. Students link the structure of amines to observable properties and predict how amines may behave in organic reactions.

Learning intentions

• WALT identify amines by their functional group and general formula features.
• WALT describe how the amine functional group influences physical and chemical properties.
• WALT interpret reaction context to predict why amines are important in organic chemistry.
• WALT use scientific vocabulary accurately in discussion and short responses.

Success criteria

• I can name and classify amines (primary/secondary/tertiary or simple examples) from their structure.
• I can explain how the amine functional group affects reactivity and/or bonding compared with a hydrocarbon.
• I can justify a prediction about an amine’s role in an organic reaction using functional-group ideas.
• I can record observations/ideas clearly using evidence-based statements.

Curriculum links

• Science achievement standard AS91187 — Carry out a practical Earth and Space Science investigation (context link for “investigation practice” skills such as method clarity and reporting; used here as a skills model for structured practical thinking).
• NZ Curriculum Science (Nature of Science): students develop understanding through investigating, using evidence, and communicating findings.
• Scientific inquiry: planning/working scientifically skills adapted into today’s structured functional-group investigation and reporting.

Lesson structure (60 minutes)

1. 0–5 min · Starter: Quick identity check. Teacher displays three structural sketches (one amine, one alcohol, one hydrocarbon) and asks students to decide which is the “functional group match”. Students write a one-sentence reason for each choice.

2. 5–15 min · Direct teach: What are amines? Teacher introduces the amine functional group (–NH₂, –NHR, –NR₂) and explains how nitrogen’s bonding creates characteristic behaviour. Students annotate a generic structure diagram and complete a short “functional group spotting” task.

3. 15–25 min · Properties reasoning mini-demo. Teacher runs a safe, small-scale demonstration using provided materials (for example: comparing typical odour/solubility cues with teacher-led guidance, or using colour/indicator reactions where appropriate). Students record: observation, possible explanation in terms of the amine group, and an uncertainty statement.

4. 25–40 min · Modelled practice: Predicting reaction importance. Teacher provides two reaction contexts (without requiring full balancing) where amines appear, such as forming amides or acting as nucleophiles (teacher explains at a conceptual level). Students use a “Functional group → particle behaviour → reaction role” template to justify what the amine is likely doing.

5. 40–52 min · Collaborative task: Amine classification stations. Teacher splits students into groups and rotates through 3 stations with structure cards, naming prompts, and a short “explain your choice” question at each station. Students classify the amine type and write a justification using correct terms.

6. 52–58 min · Whole-class synthesis. Teacher leads a discussion: “What makes an amine an amine?” “How do nitrogen and the –N group influence chemistry?” Students share one strong justification and one question they still have.

7. 58–60 min · Exit ticket. Students answer two prompts: (1) Identify the functional group in a given amine structure, and (2) give one prediction about how the amine might behave in a reaction and why.

Resources

• Functional group cards (amine, alcohol, amide, hydrocarbon) showing –NH₂/–NHR/–NR₂ features
• Diagram handout: generic amine structures and “spot the functional group” space
• Reaction context slips (short scenarios) for conceptual prediction
• Station worksheets with classification/naming prompts and evidence-statement sentence starters
• Marker pens/highlighters, notebooks
• Teacher demonstration materials and safety guidance appropriate for school science
• Exit ticket slips (one per student)

Assessment

• Formative during starter: teacher checks written reasons for correct functional group reasoning.
• Formative during station work: teacher circulates to look for accurate classification and evidence-based justification.
• Exit ticket: assesses whether students can (a) identify the amine functional group and (b) justify a functional-group-based prediction.

Differentiation

• Support: sentence starters for justifications (e.g., “This is an amine because…”, “The amine group may… due to…”), plus a worked example card at the first station.
• Support: grouping students strategically so each team has at least one stronger explainer and one recorder.
• Extension: add a third prediction prompt at stations (e.g., compare likely behaviour of primary vs tertiary amines in the same context) and ask students to reference the functional group in their reasoning.
• EAL/SEN: provide vocabulary bank for key terms (amine, functional group, nitrogen, nucleophile, primary/secondary/tertiary) and allow oral responses before writing at stations.

Extension (optional)

• Skip (not requested).