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.…
Ionic lattices and their properties
Explain that ionic compounds form three-dimensional lattices described by empirical formulas, and account for their high melting points, low volatility, conductivity only when molten or dissolved, and solubility in polar solvents in terms of the lattice.
Tę umiejętność sprawdza 18 zadań wzorowanych na arkuszach IB z lat 2022–2026.
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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…
Zadanie 10
What is the formula of the compound formed from calcium ions and phosphate ions? A. CaPO4 B. Ca3(PO4)2 C. Ca2(PO4)3 D. Ca3PO4
Zadanie 7
A white crystalline solid has the properties shown in the table. Which structure is consistent with these properties? A. Giant metallic lattice B. Giant covalent network C. Molecular covalent solid D. Giant ionic lattice
- Tabela do uzupełnienia
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 10
A solid has a very high melting point, does not conduct electricity when solid or when molten, and is insoluble in water and in non-polar solvents. Which type of structure does the solid have? A. Ionic lattice B. Metallic lattice C. Covalent molecular D.…
Zadanie 12
In which compound is the electrostatic attraction between the ions weakest? A. MgO B. CaO C. CaS D. MgS
Zadanie 6
What is the formula of the compound formed between aluminium ions and sulfate ions? A. AlSO4 B. Al2(SO4)3 C. Al(SO4)3 D. Al3(SO4)2
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 6b
Chromium is a first-row transition element. (i) Deduce the nuclear symbol, ZAX, of the chromium-52 ion that contains 21 electrons. (ii) Chromium(II) chloride, CrCl2, melts at 824 °C. Explain how the ions are held together in solid…
Zadanie 1
A sample of ammonium sulfate, (NH4)2SO4, has a mass of 66.1 g. Mr = 132.17 How many moles of ammonium ions are present in the sample? A. 0.25 B. 0.50 C. 1.00 D. 1.50
Zadanie 2a
In the solid state, calcium, Ca, and calcium chloride, CaCl2, are each built as a regular three-dimensional lattice. Predict the electrical conductivity of Ca(s) and of CaCl2(s), giving a reason for each.
Zadanie 10
Four solids, P, Q, R and S, were tested. The results are shown in the table. Which solid most likely has an ionic lattice structure? A. P B. Q C. R D. S
- Tabela do uzupełnienia
Zadanie 2b
Calcium hydride, CaH2, is an ionic compound that forms a crystalline lattice of Ca2+ and H− ions. Deduce whether calcium hydride behaves as a Brønsted–Lowry acid or as a Brønsted–Lowry base, and justify your answer.
Zadanie 10
The formula for yttrium nitrate is Y(NO3)3. What is the formula for yttrium oxide? A. Y2O3 B. YO C. YO3 D. Y3O2
Zadanie 10
Which statement explains the high melting point of magnesium oxide? A. Strong covalent bonds between magnesium and oxygen atoms must be broken B. Strong intermolecular forces hold magnesium oxide molecules together C. A large amount of energy is needed to…
Zadanie 10
What is the type of bonding in a solid that is brittle, has a high melting point, does not conduct electricity when solid but conducts when molten? A. Ionic B. Molecular covalent C. Metallic D. Giant covalent
Zadanie 30
A solution of barium hydroxide of concentration 0.10 mol dm−3 was added dropwise to 25 cm3 of copper(II) sulfate solution of concentration 0.10 mol dm−3 until 25 cm3 of the barium hydroxide solution had…
- Materiał graficzny