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Chemistry and Materials Science Flashcards

6 cards from real EIT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Chemistry and Materials Science flashcards as text

  1. The atomic number of an element represents the number of:

    Answer: Protons in the nucleus

    The atomic number Z uniquely identifies an element and equals the number of protons in the nucleus.

  2. Avogadro's number (6.022 × 10²³) represents the number of entities in:

    Answer: One mole of a substance

    One mole of any substance contains exactly 6.022 × 10²³ particles (atoms, molecules, ions, etc.).

  3. The pH of a neutral aqueous solution at 25°C is:

    Answer: 7

    At 25°C, pure water has [H⁺] = [OH⁻] = 10⁻⁷ mol/L, giving pH = −log(10⁻⁷) = 7.

  4. The ideal gas law PV = nRT uses R = 8.314 J/(mol·K) when pressure is in:

    Answer: Pascals (Pa)

    R = 8.314 J/(mol·K) = 8.314 Pa·m³/(mol·K), consistent with SI units where P is in Pascals and V in m³.

  5. The crystal structure of iron (Fe) at room temperature is:

    Answer: Body-centered cubic (BCC)

    Iron is BCC at room temperature (α-iron), transforming to FCC (γ-iron) above 912°C.

  6. Faraday's law of electrolysis states that the mass deposited at an electrode is proportional to:

    Answer: The total charge passed through the electrolyte

    Faraday's law: m = MIt/(nF), where mass deposited is directly proportional to total charge Q = It passed.