The ionic model

Chemia IBPaper 2, maj 2026, TZ1wzorowane4 pktotwarteśrednie (szac.)

Zadanie 1c

The final step can be summarized as: 3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g) ΔH^⊖ = −138 kJ mol⁻¹ (i) Sketch an energy profile for the overall reaction, indicating ΔH^⊖ and the activation energy. (ii) Describe the…

• Materiał graficzny

Chemia IBPaper 2, maj 2026, TZ3wzorowane5 pktotwarteśrednie (szac.)

Zadanie 1a

(i) Magnesium burns in oxygen according to the equation $\ce{Mg(s) + 1/2 O2(g) -> MgO(s)}$. Explain, using electron configurations, how ions are formed by magnesium and oxygen and how these ions form a compound. (ii) Explain, using electron configurations, why…

Chemia IBPaper 1A, maj 2026, TZ2wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 6

Which compounds contain ionic bonds? I. SiO₂ II. CH₃COONa III. MgO A. I and II only B. I and III only C. II and III only D. I, II and III

Chemia IBPaper 1A, maj 2026, TZ3wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 6

Chrome alum has the formula KCr(SO₄)₂ ⋅ 12 H₂O. Which option shows the charges of the ions that make up this salt, in the order potassium, chromium, sulfate? A. K⁺, Cr²⁺, SO₄²⁻ B. K⁺, Cr³⁺, SO₄³⁻ C.…

Chemia IBPaper 1A, maj 2026, TZ1wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 7

Which properties are expected for the compound lithium bromide? A. Not soluble in water, low melting point, does not conduct electricity when solid, does not conduct electricity when molten B. Not soluble in water, low melting point, conducts electricity when…

Chemia IBPaper 1A, maj 2026, TZ2wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 14

Why do halogens form 1− ions? A. Highly exothermic electron affinity, so the atoms gain one electron B. Low ionization energy, so the atoms lose one electron C. High ionization energy, so the atoms gain one electron D. Low electronegativity, so the atoms gain…

Chemia IBPaper 1A, maj 2026, TZ3wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 21

Which of these changes has the largest negative standard enthalpy change, ΔH^⊖? A. Na⁺(g) + Cl⁻(g) → NaCl(s) B. SrO(s) → Sr²⁺(g) + O²⁻(g) C. Ca²⁺(g) + 2 Cl⁻(g) → CaCl₂(s) D. Mg²⁺(g) + O²⁻(g) → MgO(s)

Chemia IBPaper 1A, maj 2026, TZ2wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 22

Which ionic compound is expected to have the largest lattice enthalpy? A. MgO B. NaF C. KBr D. CaS

Chemia IBPaper 2, maj 2025, TZ2wzorowane14 pktobliczenioweśrednie (szac.)

Zadanie 2b

Gallium forms a sulfate of formula Ga₂(SO₄)₃. (i) Both ionic and covalent bonding are present in this compound. State which particles are held together by each type of bond. (ii) Contrast covalent and ionic bonds in terms of what happens to the valence…

Chemia IBPaper 2, maj 2025, TZ1wzorowane4 pktotwartetrudne (szac.)

Zadanie 4c

Magnesium carbonate and magnesium chloride are ionic compounds. (i) The Born-Haber cycle for magnesium chloride, MgCl₂, is shown with three boxes left empty. Annotate the cycle by writing the name of the process, or the formulas of the species present…

• Materiał graficzny