Flashcards – 2.1.1 Nature of Matter
 Question |  Difficulty |  Tags | Lesson |  Answer | Module |
|---|---|---|---|---|---|
| What makes an element an element? | Easy | EasyElementsModule 2.1 | 2.1.1 Nature of Matter | An element is a pure substance made of one kind of atom. It keeps its identity because its atoms have the same proton count (atomic number). WHY IT MATTERS: Material selection (aluminum, copper, titanium) depends on element-level properties. AIRCRAFT EXAMPLE: Aluminum structure vs copper wiring: different elements, different properties. MEMORY AID: PEN: Proton = Element = Number. EASA TIP: Identity questions almost always point to protons/atomic number. | Module 2.1 |
| What two main features define an atom’s basic structure? | Easy | AtomsEasyModule 2.1 | 2.1.1 Nature of Matter | An atom has a nucleus (protons and neutrons) with electrons moving around it in shells. Those parts together determine identity, mass, and chemical behavior. WHY IT MATTERS: You need atomic basics to understand bonding, conductivity, and insulation. AIRCRAFT EXAMPLE: In aircraft wiring, electrons are the moving charge carriers in the conductor. MEMORY AID: N-E: Nucleus inside, Electrons outside. EASA TIP: Expect “which particle is where?” style questions. | Module 2.1 |
| What is the valence shell and why do we care about it? | Medium | MediumModule 2.1Valence | 2.1.1 Nature of Matter | The valence shell is the outermost electron shell of an atom. Its electron count strongly affects bonding and whether electrons can move easily (conductors vs insulators). WHY IT MATTERS: Understanding valence helps you predict if a material will carry current or block it. AIRCRAFT EXAMPLE: Wire insulation materials resist electron flow because electrons aren’t free to move. MEMORY AID: Valence = “outer layer decisions.” EASA TIP: EASA loves “outer shell” questions tied to bonding and conductivity. | Module 2.1 |
| Why are some materials good conductors? | Medium | ConductorsMediumModule 2.1 | 2.1.1 Nature of Matter | In conductors, some electrons can move freely between atoms, creating current flow. This usually happens when the outer electrons are not tightly bound. WHY IT MATTERS: It’s the basic reason aircraft power can be distributed through wiring. AIRCRAFT EXAMPLE: Copper conductors allow easy electron flow in a 737 electrical harness. MEMORY AID: Conductor = electrons can “walk around.” EASA TIP: If the question mentions “free electrons,” the correct concept is conductivity. | Module 2.1 |
| How does the number of protons relate to an element’s identity? | Medium | Atomic NumberMediumModule 2.1 | 2.1.1 Nature of Matter | The proton count (atomic number) is the element’s ID card. If you change protons, you change the element completely, even if neutrons/electrons differ. WHY IT MATTERS: It explains why different metals behave differently in strength, corrosion, and conductivity. AIRCRAFT EXAMPLE: Copper and aluminum behave differently because their proton counts differ. MEMORY AID: Protons = the element’s “name.” EASA TIP: Exam trick: electrons can change (ions) without changing the element. | Module 2.1 |
| What are the common states of matter discussed in physics? | Easy | EasyModule 2.1States | 2.1.1 Nature of Matter | The common states are solid, liquid, gas, and plasma. The state depends mainly on how much energy the particles have and how freely they move. WHY IT MATTERS: State changes explain fuel vaporization, oxygen storage, and hydraulic behavior. AIRCRAFT EXAMPLE: Cabin pressurization depends on gas behavior; hydraulics depend on liquid behavior. MEMORY AID: SLGP: Solid–Liquid–Gas–Plasma. EASA TIP: EASA may ask which state is compressible (gas) vs nearly incompressible (liquid). | Module 2.1 |
| What is matter? | Easy | EasyMatterModule 2.1 | 2.1.1 Nature of Matter | Matter is anything that has mass and takes up space. If it occupies space and you could, in principle, measure its mass, it’s matter. WHY IT MATTERS: Everything you inspect or service on an aircraft is made of matter, including fluids and gases. AIRCRAFT EXAMPLE: Hydraulic fluid in an A320 is matter even though it flows and takes container shape. MEMORY AID: MSM: Mass + Space = Matter. EASA TIP: Level 1 exams often start with simple definitions. | Module 2.1 |
| Why doesn’t matter “disappear” when fuel burns in an engine? | Medium | ConservationMediumModule 2.1 | 2.1.1 Nature of Matter | Because matter is conserved in normal chemical reactions. The fuel changes into different substances (mostly hot gases), but the total matter remains. WHY IT MATTERS: This helps you reason about exhaust gases, contamination, and closed-system behavior. AIRCRAFT EXAMPLE: Jet fuel in a turbofan becomes exhaust products, not “nothing.” MEMORY AID: Fuel → gases (it’s a change of form). EASA TIP: Look for wording like “created/destroyed” and choose “changed form/state.” | Module 2.1 |
| What is an isotope? | Easy | EasyIsotopesModule 2.1 | 2.1.1 Nature of Matter | Isotopes are atoms of the same element that have different numbers of neutrons. Same protons means same element; different neutrons changes mass. WHY IT MATTERS: Isotopes show up as exam traps and explain why mass can vary without changing the element. AIRCRAFT EXAMPLE: Hydrogen isotopes are a classic example; the element stays hydrogen but mass changes. MEMORY AID: Same P, different N → isotope. EASA TIP: If the question says “same element but different mass,” think isotopes. | Module 2.1 |
| What do electrons mainly control in an atom: identity or behavior? | Medium | ElectronsMediumModule 2.1 | 2.1.1 Nature of Matter | Electrons mainly control behavior, especially bonding and electrical conductivity. Identity is set by protons, but electrons decide how atoms interact and share charge. WHY IT MATTERS: This connects directly to wiring faults, insulation needs, and bonding of materials. AIRCRAFT EXAMPLE: Free electron movement in a conductor enables current in aircraft systems. MEMORY AID: Protons = ID, electrons = personality. EASA TIP: If you see conductivity/bonding, think electrons (valence electrons). | Module 2.1 |
| What’s the difference between a compound and a mixture? | Medium | CompoundsMediumMixturesModule 2.1 | 2.1.1 Nature of Matter | A compound is chemically bonded in a fixed ratio and needs a chemical process to separate. A mixture is a physical blend and can often be separated mechanically (like filtering or draining). WHY IT MATTERS: This matters for contamination: sometimes you can separate it; sometimes you can’t without chemistry. AIRCRAFT EXAMPLE: Water in fuel is a mixture you can separate; water itself is a compound you can’t mechanically split into elements. MEMORY AID: Compound = bonded; mixture = blended. EASA TIP: EASA often asks which can be separated by mechanical means (mixtures). | Module 2.1 |
| A technician says: “Hydrogen-2 isn’t hydrogen; it’s a different element.” What’s the correct explanation? | Hard | HardIsotopesModule 2.1 | 2.1.1 Nature of Matter | Hydrogen-2 is still hydrogen because it has the same number of protons. It’s an isotope: it has extra neutrons, which changes mass but not the element’s identity. WHY IT MATTERS: This prevents confusion in exam questions and basic materials science reasoning. AIRCRAFT EXAMPLE: Hydrogen isotopes are taught early because they’re easy examples of same element, different mass. MEMORY AID: Same P = same element (always). EASA TIP: If the stem says “same atomic number,” the element is the same—watch for isotope wording. | Module 2.1 |
| Why are materials with “full valence shells” often good insulators? | Medium | InsulatorsMediumModule 2.1 | 2.1.1 Nature of Matter | If the outer shell is effectively complete and stable, electrons are held tightly and don’t move easily. That resistance to electron movement means poor current flow (insulating behavior). WHY IT MATTERS: Insulation prevents shorts and protects structure from unintended current paths. AIRCRAFT EXAMPLE: Polymer wire insulation keeps current inside the conductor instead of into the aircraft frame. MEMORY AID: Full shell = electrons “stay put.” EASA TIP: Exam trap: don’t confuse “stable” with “conductive”—stable shells usually resist current. | Module 2.1 |
| A fuel sample from a Boeing 737 shows water droplets at the bottom. Is this a compound issue or a mixture issue, and what action fits the concept? | Hard | HardMixturesModule 2.1 | 2.1.1 Nature of Matter | This is a mixture issue: water and fuel are physically mixed but not chemically bonded. You can often separate it by draining/sumping because it’s not a chemical bond you need to break. WHY IT MATTERS: It supports correct contamination handling and prevents icing or engine issues. AIRCRAFT EXAMPLE: Fuel tank sump drains remove water because it settles due to density difference. MEMORY AID: Mixture = separable (often). EASA TIP: Exam trick: water-in-fuel is a mixture; water itself is a compound. | Module 2.1 |
| During wiring troubleshooting on an A320, you see current leakage to structure. Which matter concept helps explain the fix? | Hard | ConductivityHardInsulatorsModule 2.1 | 2.1.1 Nature of Matter | Conductors allow electrons to move, but insulation should prevent electron movement outside the wire. If insulation is damaged, electrons can travel to unintended paths (structure), causing leakage or shorts. WHY IT MATTERS: It links atomic electron behavior to real electrical faults and safety risks. AIRCRAFT EXAMPLE: Damaged wire insulation in a harness can cause intermittent faults or arcing. MEMORY AID: Current follows the easiest path if insulation fails. EASA TIP: EASA scenario questions often connect “insulator vs conductor” to faults. | Module 2.1 |