Zadanie 2c
(i) Write the equation for the reaction of Rb with water, H2O, including state symbols. (ii) Describe the type of bonding in Rb and in H2O, and explain how the valence electrons in each produce that type of bond.
Metallic bonding and properties of metals
Describe the metallic bond as electrostatic attraction between a lattice of cations and delocalized electrons, and use it to explain the electrical conductivity, thermal conductivity, malleability and ductility of metals and to link these properties to their uses.
Tę umiejętność sprawdza 12 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 12 Otwórz w wyszukiwarce z filtrami
Zadanie 3a
(i) Describe the structure of solid magnesium and state the forces that hold it together. (ii) Explain why a piece of magnesium can be hammered into a new shape without breaking. (iii) Explain why the melting point of magnesium is higher than that of sodium.
Zadanie 1c
A student proposed that, because tin(IV) iodide might be ionic, electrolysing the molten compound with inert electrodes should regenerate tin and iodine. (i) Label the diagram of the electrolytic cell to show which electrode is the anode and which is the…
- Materiał graficzny
Zadanie 9
Which statement best explains why aluminium can be drawn into thin wires? A. The delocalized electrons carry charge through the metal. B. The layers of aluminium ions can slide over each other while the delocalized electrons keep the lattice bonded. C.…
Zadanie 8
Which properties of copper depend on the movement of its delocalized electrons? I. electrical conductivity of the molten metal II. thermal conductivity III. high density A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 11
What is the explanation for the ductility of copper, which allows it to be drawn into wires? A. The attraction between the cations and the delocalized electrons is weak. B. The cations are held in the lattice by strong bonds that act in fixed directions. C.…
Zadanie 11
Which statement best explains why a block of copper can be hammered into a thin sheet without breaking? A. Cations in neighbouring layers repel one another, so they stay fixed in their positions B. Layers of cations can slide over one another because the…
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 12
Which statements about alloys are correct? I. Alloys can contain non-metallic elements as well as metals. II. Alloys are usually softer than the pure metals they contain, because their layers slide over each other more easily. III. Atoms of different sizes…
Zadanie 4a
Brass is an alloy of copper and zinc. Explain why brass is harder and stronger, but a poorer conductor of electricity, than pure copper.
Zadanie 4b
Outline why copper is malleable.
Zadanie 1g
State the type of bonding in calcium, nitrogen and calcium nitride, and how the valence electrons produce each type of bonding.