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.
Group 1 and group 17 reactivity trends
Describe and explain the increasing reactivity of alkali metals with water down group 1 and the decreasing reactivity of halogens down group 17, writing equations for metal-water reactions and halogen displacement of halide ions.
Tę umiejętność sprawdza 12 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 12 Otwórz w wyszukiwarce z filtrami
Zadanie 3c
Sodium reacts vigorously with water. (i) Write an equation, with state symbols, for the reaction of sodium with water. (ii) Describe one observation from the reaction in (i). (iii) Sketch, on the axes below, an energy profile for this reaction. Label the…
- Materiał graficzny
Zadanie 3b
(i) Outline why the strength of the metallic bond increases from potassium, K, to calcium, Ca. (ii) Write an equation for the reaction of potassium, K, with water, including state symbols. (iii) Outline why the electronegativity of chlorine is greater than…
Zadanie 12
Which row correctly describes how the properties of the halogens change down group 17, listed in the order: non-metallic character, boiling point of the element, atomic radius? A. Increases, increases, increases B. Decreases, increases, increases C. Decreases,…
Zadanie 14
Which pair of elements reacts together most vigorously? A. Sodium and bromine B. Potassium and bromine C. Sodium and chlorine D. Potassium and chlorine
Zadanie 16
Which pair of elements would react together most vigorously? A. Na(s) and I2(s) B. Cs(s) and I2(s) C. Na(s) and F2(g) D. Cs(s) and F2(g)
Zadanie 15
Which statement is correct for the group 17 elements from chlorine to iodine? A. The first ionization energy of the elements decreases. B. The elements become stronger oxidizing agents. C. The elements become more volatile. D. The radius of the halide ion…
Zadanie 3c
A computer simulation models what happens when small pieces of lithium and of sodium are dropped into water. For each metal five pieces of increasing mass are used, the same set of masses for both metals, and the simulation records how long each piece takes to…
- Materiał graficzny
Zadanie 3e
Calcium reacts with water to form calcium hydroxide solution and hydrogen gas. Ca(s) + 2 H2O(l) → Ca(OH)2(aq) + H2(g) (i) Calculate the enthalpy change, in kJ, when 5.00 g of calcium reacts completely with water. Use section 13 of the data booklet.…
Zadanie 1e
Estimate the atomic volume, in cm3 mol−1, of element 20.
Zadanie 7
Which properties decrease down group 17, the halogens? I. electronegativity II. first ionization energy III. melting point A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 6
Which pair of elements, one from group 1 and one from group 17, is expected to react together least vigorously? A. lithium and chlorine B. lithium and iodine C. sodium and bromine D. potassium and chlorine