Topic 1.1a – Elements vs. Compounds & Heterogeneous vs. Homogeneous Mixtures
In this topic you will learn the differences between elements and compounds and homogeneous vs. heterogeneous mixtures. Take your guided video notes as you follow along with the video, complete your activities, and do amazing on your topic quiz!
FSI Courses · Physical Science
Elements & Compounds vs.
Homogeneous & Heterogeneous Mixtures
Video Notes & Interactive Activities — Complete all four sections, then grade each one!
Describe & explain the difference between pure substances and compounds
Describe & explain the difference between heterogeneous and homogeneous mixtures
Section 1 — Fill in the Blank
Type the correct word or phrase in each blank. (8 questions)
Question 1 of 8
A substance is pure because it only consists of one type of thing and cannot be broken down into other types of substances.
Question 2 of 8
A is a combination of two or more elements that can be broken down into its individual elements.
Question 3 of 8
The water molecule (H₂O) is a compound made up of hydrogen atoms and oxygen atom.
Question 4 of 8
karat gold is 100% pure, making it the most expensive form of gold because it contains no other metals.
Question 5 of 8
A mixture is blended so thoroughly together that you cannot see the individual substances — every sample of the mixture looks the same throughout.
Question 6 of 8
A mixture has a composition that is not uniform throughout, meaning you can see and pick out individual parts of the mixture.
Question 7 of 8
Brass is a homogeneous mixture made of % zinc and % copper.
Question 8 of 8
You cannot break an down any further, but you can break a down into its individual components.
Section 2 — Multiple Choice
Choose the single best answer for each question. (6 questions)
Question 1 of 6
Which of the following is an example of a pure substance (element)?
✅ Correct Answer: C – Helium. Helium atoms only combine with themselves, so it is a pure element that cannot be broken down.
Question 2 of 6
Why is 24 karat gold the most expensive form of gold?
✅ Correct Answer: D. 24 karat gold is 100% pure — no other metals are combined with it.
Question 3 of 6
Water (H₂O) is an example of a compound because:
✅ Correct Answer: B. Water is made of two hydrogen atoms + one oxygen atom — it is chemically bonded and can be broken down.
Question 4 of 6
Which of the following is the best example of a heterogeneous mixture?
✅ Correct Answer: C – Vegetable soup. Different spoonfuls contain varying amounts of different vegetables — the composition is not uniform.
Question 5 of 6
What percentage of pure gold is found in 14 karat gold?
✅ Correct Answer: C – 58.3%. 14 karat gold is 58.3% pure gold; the rest is a mixture of other metals.
Question 6 of 6
Which statement best describes a homogeneous mixture?
✅ Correct Answer: B. A homogeneous mixture is uniform throughout — like lemonade, brass, air, wine, or steel.
Section 3 — Multi-Select
Select all correct answers for each question. (3 questions)
Question 1 of 3
Which of the following are examples of HOMOGENEOUS mixtures? Select all that apply
✅ Correct Answers: A (Lemonade), C (Brass), E (Air), F (Steel), G (Wine) — all uniform/thoroughly blended mixtures.
Question 2 of 3
Which statements are TRUE about COMPOUNDS? Select all that apply
✅ Correct Answers: A, C, D, F — Compounds are 2+ elements chemically bonded, can be broken down, and H₂O is a classic example.
Question 3 of 3
Which of the following are examples of pure substances (ELEMENTS)? Select all that apply
✅ Correct Answers: B (Helium), C (Oxygen), E (Gold 24K), G (Carbon) — each is made of only one type of atom and cannot be broken down further.
Section 4 — Drag & Drop
Drag each example into the correct category box. (12 items)
📌 Instructions: Drag each item from the Word Bank and drop it into the matching category below. Items can be dragged back to the bank if needed.
🗂️ Word Bank — Drag from here
Helium
Water (H₂O)
Lemonade
Vegetable Soup
Brass
Garden Salad
Oxygen (O₂)
Carbon Dioxide (CO₂)
Air
Pizza
Gold (24K)
Steel
⬇️ Drop Zones
ELEMENT Pure Substance — 1 type of atom, cannot be broken down
COMPOUND 2+ elements chemically bonded, can be broken down
HOMOGENEOUS Uniform throughout — looks like 1 substance
HETEROGENEOUS Not uniform — can see & pick out individual parts
FSI Courses: Elements, Compounds, & Mixtures Review Game
8th Grade Science • S8P1 • Elements, Compounds, & Mixtures • Minecraft‑style review
❤️ Lives: 3
⭐ Score: 0
🏆 Best: 0
How to Play
Beat three blocky levels to prove your science mastery! Drag with mouse or finger. Tap a tile to pick up, then tap a bin to drop on phones/tablets. Keyboard users: press Tab to focus a tile, then Enter to pick up or drop. Each correct action gives points; mistakes cost points and lives. Lose all lives and the level restarts.
- Level 1 – Sort & Crafting Table: Drag tokens into Elements, Compounds, or Mixtures.
- Level 2 – Builder Challenge: Classify randomized “trick” cards under time pressure and streak for bonus.
- Level 3 – Milestones Quiz: Multiple‑choice questions aligned to S8P1.
Level 1 – Sort Elements, Compounds, & Mixtures
Inventory
Elements
Compounds
Mixtures
Level 2 – Builder Challenge
Cards appear one by one. Drop each into the correct bin. Build a streak for bonus points!
Card
Elements
Compounds
Mixtures
🔥 Streak: 0
Cards Left: 0
Level 3 – Milestones‑Style Quiz
Great Job!
Elements, Compounds & Mixtures — Interactive GSE S8P1 (Matter)
15–20 min1) Mini‑Lesson
Goal: Distinguish elements, compounds, and mixtures using particle models, composition, and separation methods.
Element A pure substance made of one kind of atom (e.g., He, Fe, O2). Diatomic molecules like O2 are still elements because they contain one type of atom.
Compound A pure substance of two or more elements chemically bonded in a fixed ratio (e.g., H2O is always 2 H : 1 O). Must be separated by chemical means.
Mixture Two or more substances physically combined in a variable ratio (e.g., air, saltwater). Components keep their properties and can be separated physically.