Matter Builders Lab Worksheet
12 Matter Builders Lab
Name: Date: Class:
Part A: Vocabulary Matching • Write the matching definition letter (A, B, or C) in each box
1. Element: Pure; only 1 kind of atom
2. Compound: 2+ elements chemically bonded
3. Mixture: 2+ substances physically mixed
A. Two or more different elements chemically bonded (stuck together); can only be separated by a chemical change (e.g., H₂O, NaCl).
B. The simplest pure substance made of only one type of atom; cannot be broken down simpler (e.g., pure gold Au, iron Fe).
C. Two or more substances physically mixed together that keep their own traits; can be separated by hand or filtering (e.g., salad, air).
Part B: Concept Map of Matter • Fill in the Classification Tree Word Bank: Pure Substance • Mixture • Element • Compound
MATTER • Anything that has mass and takes up space
Category:
Pure • Cannot be separated by physical methods
Type:
Made of only 1 kind of atom (e.g., Gold, O₂)
Type:
2+ different elements chemically bonded (e.g., H₂O)
Category:
Blend of substances • Can be separated physically
Two or more substances physically mixed together, but NOT chemically bonded. e.g., Air, Saltwater, Salad
Each part keeps its own properties (can be pulled apart)
Part C: Atom vs. Molecule • Understanding the Particles
Atom = 1 Single Building Block The basic unit of an element. Think of it as one individual loose Lego brick.
Molecule = 2+ Atoms Bonded (Snapped) Forms when 2+ atoms snap together. Can be the same atom (O₂) or different atoms (H₂O)!
Q1. Can an element also be a molecule? Explain using Oxygen gas (O₂):
Q2. Can a single atom ever be a compound? Why or why not?:
Substances: Element = 1 color | Compound = 2+ colors snapped | Mixture = loose mix Particles: Atom = 1 loose brick | Molecule = 2+ bricks snapped
Section 2: Lego Building Investigation Key: Red = Oxygen (O) • Blue = Hydrogen (H) • Yellow = Carbon (C)
Build 1: Single Elemental Atoms 4 Loose Blue
Place 4 separate blue bricks. Do NOT snap them together.
Sketch your Lego build here: Draw 4 separate bricks
Total Atoms: Molecules: Class: [ Element / Compound / Mixture ]
Build 2: Element Molecule (Oxygen Gas) 2 Red Snapped
Snap 2 red bricks tightly together to model O₂ (oxygen gas).
Sketch your Lego build here: Show 2 bricks snapped
Total Atoms: Molecules: Class: [ Element / Compound / Mixture ]
Build 3: Compound Molecule (Water) 1 Red + 2 Blue Snapped
Snap 2 blue bricks (H) onto 1 red brick (O) to model H₂O.
Sketch your Lego build here: Show 2 blue on 1 red
Total Atoms: Elements: Class: [ Element / Compound / Mixture ]
Build 4: A Physical Mixture Build 2 + Build 3 in Cup
Put your O₂ molecule and H₂O molecule together in one cup.
Sketch your Lego build here: Show both inside cup
Chemically bonded?: [ Yes / No ] Class: [ Mixture ]
Section 2 (Continued): Lego Build Data & Observations Complete using your models from Page 1
| Build # | Formula / Bricks Used | Chemically Snapped (Bonded)? | Total Atoms | Classification (Element, Compound, Mixture) |
|---|
| Build 1 | 4 Loose Blue (H) | No (Unbonded) | | |
| Build 2 | 2 Red Snapped (O₂) | Yes (Snapped) | | |
| Build 3 | 1 Red + 2 Blue Snapped (H₂O) | Yes (Snapped) | | |
| Build 4 | O₂ and H₂O in 1 cup | No (Just in cup) | | |
Section 3: Scientific Questions & Analysis Answer in complete sentences
1. The Snapping Mystery: Chemical Bonds vs. Physical Mixing
In our lab, you had to pull snapped bricks apart with your fingers, but you could separate the mixture in Build 4 by simply pouring them out. What does snapping represent in real matter, and why can compounds only be separated by a chemical change?
2. Real-World Matter Classification: Classify each everyday item below
| Substance | What It Is Made Of | Element / Compound / Mixture | Why? (Your Clues & Reasoning) |
|---|
| Gold Bar (Au) | Only pure Gold atoms | | |
| Table Salt (NaCl) | Sodium & Chlorine chemically bonded | | |
| Air We Breathe | Nitrogen, Oxygen, and other gases mixed | | |
| Carbon Dioxide (CO₂) | 1 Carbon bonded to 2 Oxygens | | |
| Italian Salad Dressing | Oil, vinegar, and spices mixed in a bottle | | |
3. Concept Check: "Every molecule is a compound." Do you agree or disagree?
Look at your Lego model of Oxygen gas (Build 2). Use it as evidence to explain why this statement is either true or false:
4. Scientific CER Challenge: The Iron & Sulfur Mystery
A beaker holds black iron filings and yellow sulfur powder stirred together. A student holds a magnet above the beaker and easily pulls all the iron filings out, leaving the sulfur behind.
Claim: Element, compound, or mixture?
Evidence: What observation proves it?
Reasoning: Why did magnet separate them?
5. Final Synthesis: In your own words, summarize the difference between a compound (chemically bonded) and a mixture (physically mixed):
