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
Ionic bonding and formulas of ionic compounds
Describe the ionic bond as electrostatic attraction between oppositely charged ions, and write the formula and name of an ionic compound from its ions, including polyatomic ions such as ammonium, hydroxide, nitrate, carbonate, sulfate and phosphate.
Tę umiejętność sprawdza 16 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 16 Otwórz w wyszukiwarce z filtrami
Zadanie 1a
(i) Magnesium burns in oxygen according to the equation . 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…
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
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)
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…
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
Zadanie 6b
Both ionic and covalent bonding are present in sodium ethanedioate, Na2C2O4. (i) Describe both types of chemical bonding present in this compound. Ionic bonding: Covalent bonding: (ii) Deduce a Lewis formula of the ethanedioate ion, C2O42−.…
Zadanie 6
Calcium ions and phosphate(V) ions combine to form an ionic compound. What is its formula? A. CaPO4 B. Ca2(PO4)3 C. Ca3(PO4)2 D. Ca3(PO3)2
Zadanie 7
Which row shows the correct formula of aluminium sulfide and the electron configuration of each species in it? A. Al3S2; Al species [Ne]; S species [Ar] B. Al2S3; Al species [Ne] 3s2 3p1; S species [Ne] 3s2 3p4 C. Al2S3; Al…
Zadanie 2b
(i) For the carbonate ion, draw its Lewis formula. (ii) Write the chemical formula of ammonium carbonate. (iii) State why all three C–O bonds in the carbonate ion are identical. (iv) Using section 11 of the data booklet, predict the length of the C–O bonds in…
Zadanie 6
Part of the lattice of potassium bromide, KBr, is shown in an expanded view. Which statement about the lattice of potassium bromide is correct? A. Each bromide ion is in contact with six potassium ions. B. Neighbouring ions are held together by shared pairs of…
- Materiał graficzny
Zadanie 13
In which compound is the electrostatic attraction between the ions weakest? A. MgO B. CaO C. CaS D. MgS
Zadanie 1d
Describe the bonding between the ions in solid disodium tartrate, Na2C4H4O6.
Zadanie 3a
Potassium bromide, KBr, forms a three-dimensional lattice of ions. (i) Demonstrate how the electronegativity values and bonding triangle in sections 9 and 17 of the data booklet support an ionic model for this solid. (ii) Outline the nature of the…
Zadanie 7b
Potassium iodide, KI, and potassium metal, K, are both solids at room temperature. State the type of bonding in each of the two solids and describe it.
Zadanie 9
A compound consists of Al3+ and SO42− ions. What are the name and formula of the compound? A. Aluminium sulfite, Al2(SO3)3 B. Aluminium sulfate, Al3(SO4)2 C. Aluminium sulfide, Al2S3 D. Aluminium sulfate, Al2(SO4)3