Lesson 38: Qualities of Materials — Answer Key & Guide
Curriculum Focus & Learning Objectives
• Non-Count (Mass) Nouns as Subjects: Materials (iron, gold, silver, glass) are used without articles in generalized statements.
• Descriptive Compound Predicates: Pairing physical properties accurately with coordinating conjunction and.
| # |
Target Material & Prompts |
Standard Model Answer |
Instructional & Grammar Notes |
| 1. |
Iron (hard / heavy) |
Iron is hard and heavy. |
Acceptable: Iron is heavy and hard. Point out that Iron starts with a capital letter and has no article. |
| 2. |
Gold (heavy / yellow) |
Gold is heavy and yellow. |
Acceptable: Gold is yellow and heavy. Reinforces combining physical weight and appearance. |
| 3. |
Silver (bright / white) |
Silver is bright and white. |
Parallel structure with rhyming adjectives: bright and white. |
| 4. |
Glass (clear / brittle) |
Glass is clear and brittle. |
Vocabulary extension: brittle means easily broken. Also acceptable: Glass is clear and smooth. |
Science Connection
Discuss why iron and gold are called metals. Contrast the weight of iron with lighter materials like wood or feathers to reinforce the meaning of heavy.
Article Awareness
Point out to students that we do not say "An iron is hard" or "A gold is heavy" when talking about the material in general.
| Evaluation Metric |
Target Standard (Exemplary) |
Common Correction Points |
| Sentence Combining |
One complete sentence for each material with subject, verb, and both adjectives. |
Ensure student does not write two separate sentences. |
| Subject Noun Usage |
Uses the material name correctly without unwarranted articles. |
Watch out for "The iron" or "A gold" if intended generally. |
| Mechanics |
Capital letter at start of every sentence; period (.) at end. |
Check for missing periods. |
| Spelling |
Correct spelling of materials and adjectives (heavy, yellow, bright). |
Watch out for heavy (e-a-v-y). |