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EmSAT Chemistry Flashcards

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

Read the first 6 EmSAT Chemistry flashcards as text

  1. What is the electron configuration of oxygen (atomic number 8)?

    Answer: 1s² 2s² 2p⁴

    Oxygen has 8 electrons. The configuration is 1s² 2s² 2p⁴ — 2 in the first shell and 6 in the second shell (2 in 2s and 4 in 2p).

  2. What type of bond is formed between Na and Cl in NaCl?

    Answer: Ionic bond

    NaCl forms an ionic bond. Sodium (a metal) transfers an electron to chlorine (a non-metal), creating Na⁺ and Cl⁻ ions that attract each other electrostatically.

  3. What is Avogadro's number?

    Answer: 6.022 × 10²³

    Avogadro's number is 6.022 × 10²³, representing the number of particles (atoms, molecules, ions) in one mole of a substance.

  4. Balance the equation: H₂ + O₂ → H₂O

    Answer: 2H₂ + O₂ → 2H₂O

    Balanced: 2H₂ + O₂ → 2H₂O. Left: 4H, 2O. Right: 4H, 2O. Both sides are equal, satisfying conservation of mass.

  5. What is the pH of a neutral solution at 25°C?

    Answer: 7

    A neutral solution at 25°C has pH = 7. pH 7 is basic (alkaline). Pure water at 25°C is neutral with pH = 7.

  6. What is the molar mass of water (H₂O)?

    Answer: 18 g/mol

    Molar mass of H₂O = 2(1) + 16 = 18 g/mol. Hydrogen has a molar mass of 1 g/mol and oxygen has 16 g/mol.

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Sources & references

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  1. emsat.moe.gov.ae — Test delivery, eligibility, time limit, retake fee, retake policy, score release, exam format, exam information · verified Oct 2026
  2. mohesr.gov.ae — Eligibility · verified Oct 2026