Instructions
Welcome, Apprentice Chemist! Today, you will test your knowledge of the unseen world of atoms, elements, and chemical reactions.
- Read each section carefully. Some questions will ask you to choose an answer, while others will ask you to classify, match, or write your own scientific explanations.
- Work through the sections in order. The quiz starts with core concepts and builds up to real-world chemical investigations!
- If you get stuck, look for the Chemist's Tip boxes for helpful clues.
- Complete the Super Chemist Challenge at the end if you want to test your advanced skills.
Section 1: The Core of Matter
Circle the correct answer for each of the following questions.
-
What is "matter" in scientific terms?
- A) Anything that makes people happy
- B) Anything that has mass and takes up space
- C) Only things that are solid and hard
- D) The energy of moving particles
-
Which of the following is the smallest, basic building block of all matter?
- A) An cell
- B) A crystal
- C) An atom
- D) A drop
-
When two or more different elements chemically bond together, what do they form?
- A) A compound
- B) A mixture
- C) A liquid
- D) An element family
Chemist's Tip: Remember, a physical change does not create a new substance, but a chemical change produces something entirely new with different properties!
Section 2: Matter Metamorphosis
In chemistry, matter is constantly changing. Classify each of the scenarios below as a Physical Change or a Chemical Change, and explain your reasoning in the final column.
| Scenario | Change Type (Physical or Chemical?) | Why? (Your Clue/Evidence) |
|---|---|---|
| Example: Melting chocolate | Physical | It only changed state from solid to liquid. No new substance was made. |
| 1. Baking a tray of chocolate chip cookies | ||
| 2. Crushing an aluminum soda can | ||
| 3. An iron nail rusting in the rain | ||
| 4. Dissolving table salt into warm water | ||
| 5. Lighting a wooden match so it burns to ash |
Section 3: Element Match-Up
Elements are the pure substances listed on the Periodic Table. Match the everyday item/scenario on the left to the primary element associated with it on the right by writing the correct letter in the blank space.
- 1. __ Floating party balloons that rise high in the air.
- 2. __ The sturdy metal used to build bridges, skyscraper frames, and cast-iron pans.
- 3. __ The gas we breathe in that our cells need to produce energy.
- 4. __ The shiny metal used to make foil wraps and soft-drink cans.
- 5. __ The yellow, smelly powder often found near active volcanoes.
Element Choices:
- A) Oxygen (O)
- B) Sulfur (S)
- C) Helium (He)
- D) Aluminum (Al)
- E) Iron (Fe)
Section 4: The Kitchen Lab Disaster
Read the real-world scenario below and use your knowledge of physical properties to solve the mystery.
The Scenario: While trying to prep a kitchen science experiment, your younger brother accidentally knocked a container of iron filings (tiny, dark metal particles) directly into a bowl of dry white sand. Now they are completely mixed together!
He is about to pour water in to wash the sand, but you stop him. You know a much easier, dry way to separate the iron filings from the sand instantly using their physical properties.
Your Mission: Write a short plan explaining how you will separate the iron from the sand. What tool will you use, and which physical property of iron makes this tool work?
Your Solution:
Section 5: Super Chemist Challenge
Want to prove you are ready for advanced lab work? Try this bonus challenge!
Imagine you seal a single piece of paper inside a glass jar so no air can get in or out. You use a magnifying glass to focus sunlight on the paper until it catches fire and burns completely into grey ash and smoke inside the sealed jar.
If you put the jar on a highly sensitive digital scale before the burn, and then weigh the jar again after the burn, what will happen to the weight?
- A) The jar will weigh less because the paper turned into light, floating smoke.
- B) The jar will weigh more because fire adds energy and weight to the system.
- C) The jar will weigh exactly the same because of the Law of Conservation of Mass.
In your own words, explain why you chose this answer:
Answer Key
Section 1: The Core of Matter
- B - Anything that has mass and takes up space
- C - An atom
- A - A compound
Section 2: Matter Metamorphosis
Accept logical variations of the explanations that demonstrate understanding of physical/chemical properties.
- Chemical | New substances with new properties are created (sugar, flour, and eggs chemically react to form cookie texture; smell/color changes).
- Physical | It only changed its shape; it is still aluminum metal.
- Chemical | The iron reacted with oxygen to form a new compound (iron oxide/rust) with a different color and texture.
- Physical | The salt only dissolved and became invisible, but it can be recovered by evaporating the water.
- Chemical | The wood turned into ash, smoke, and gas; heat and light were released, which cannot be easily reversed.
Section 3: Element Match-Up
- C (Helium)
- E (Iron)
- A (Oxygen)
- D (Aluminum)
- B (Sulfur)
Section 4: The Kitchen Lab Disaster
- Ideal Solution: Use a magnet.
- Explanation: Iron is ferromagnetic (magnetic), while sand is not. Hovering a magnet over the mixture will pull all the iron filings out of the sand, separating them perfectly without using water.
Section 5: Super Chemist Challenge
- Correct Choice: C (The jar will weigh exactly the same because of the Law of Conservation of Mass).
- Explanation: In a closed system, matter cannot be created or destroyed. Even though the paper turned into ash and gas (smoke), all the atoms are still trapped inside the sealed jar, so the total mass remains unchanged.