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.
The periodic table: Classification of elements
Umiejętności w tym dziale
Umiejętności z tego działu sprawdza 108 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 39 z 54 arkuszy w bazie.
Zadania z tego działu: 108 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 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 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 4b
Propane undergoes complete combustion. C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g) (i) Calculate the enthalpy change of reaction, ΔH, in kJ mol−1, for the combustion of propane. Use section 12 of the data booklet. (ii) State the…
Zadanie 11
Which classification is correct? A. Alkali metal: rubidium; transition element: platinum; halogen: xenon; noble gas: bromine B. Alkali metal: rubidium; transition element: platinum; halogen: bromine; noble gas: xenon C. Alkali metal: platinum; transition…
Zadanie 11
The diagram shows an outline of the periodic table with four regions labelled A, B, C and D. An element has the ground state electron configuration [Ar] 3d7 4s2. In which region is it found? A. Region A B. Region B C. Region C D. Region D
- Materiał graficzny
Zadanie 11
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,…