Zadanie 2b
(i) Explain why Rb has a lower first ionization energy than strontium, Sr. (ii) Outline why Rb has a lower electronegativity than potassium, K. (iii) Explain why oxygen, O, has a lower first ionization energy than nitrogen, N.
The periodic table: Classification of elements
Umiejętności w tym dziale
Umiejętności z tego działu sprawdza 166 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 47 z 54 arkuszy w bazie.
Zadania z tego działu: 166 Otwórz w wyszukiwarce z filtrami
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.
Zadanie 2e
(i) Iron, Fe, is a transition element. State two properties typical of transition elements that iron shows, other than the formation of coloured compounds. (ii) Explain why aqueous solutions containing the hexaaquacopper(II) ion, [Cu(H2O)6]2+,…
Zadanie 2b
An ‘iodine clock’ experiment can be based on two reactions that occur at the same time. S2O82−(aq) + 2 I−(aq) → 2 SO42−(aq) + I2(aq) slow 2 S2O32−(aq) + I2(aq) → S4O62−(aq) + 2 I−(aq) fast The iodine formed in the slow reaction is removed at…
Zadanie 2c
Use the position of selenium in the periodic table to outline what is known about the electron configuration of its atoms. Give one piece of information from the group number and one from the period number.
Zadanie 3
Which species has the ground state electron configuration [Ar] 3d8? A. Cu2+ B. Zn2+ C. Ni D. Ni2+
Zadanie 3f
Colorimetry is an alternative technique for determining concentration. Iron(II) ions can be converted to a red complex ion by adding 1,10-phenanthroline. (i) Outline why the concentration of iron(II) in a solution can be measured by colorimetry after this…
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 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…