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 18 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 18 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
Contrast tin and tin(IV) iodide in terms of one physical property.
Zadanie 2e
State one other physical property that could be measured to identify the metal while leaving the block intact.
Zadanie 11
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 7
In which set do all the species contain delocalized electrons? A. NH4+, C6H12, Si(s) B. CH3OH, SO2, C (diamond) C. C2H4, NO3−, SiO2 D. CO32−, C6H6, Cu(s)
Zadanie 11
Copper can be hammered into thin sheets without shattering. Which feature of metallic bonding explains this? A. The delocalized electrons are free to move through the lattice, carrying charge. B. The metallic bonds are weak, so the cations are easily displaced…
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 13
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 3a
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 3c
Bronze, an alloy of copper and tin, is used for ship propellers and bearings. Explain, by referring to its structure, why bronze is less malleable than pure copper.
Zadanie 14
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 5a
Outline the nature of the electrostatic attraction that holds together the crystal structure of solid aluminium.
Zadanie 5a
Outline the electrostatic attraction that holds a crystal of aluminium together.
Zadanie 1g
State the type of bonding in calcium, nitrogen and calcium nitride, and how the valence electrons produce each type of bonding.
Zadanie 5c
Describe the bonding in solid cobalt, Co(s).