Periodicity

Descripción

Questions orientated around periodicity in IB Chemistry (SL = questions 1 - 26; HL= all questions)
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Test por hanalou, actualizado hace más de 1 año
hanalou
Creado por hanalou hace casi 11 años
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Resumen del Recurso

Pregunta 1

Pregunta
Describe the electronegativity and atomic radius trend across a period
Respuesta
  • The electronegativity decreases across a period The atomic radius decreases across a period
  • The electronegativity increases across a period The atomic radius decreases across a period
  • The electronegativity Increases across a period The atomic radius increases across a period
  • The electronegativity decreases across a period The atomic radius increases across a period

Pregunta 2

Pregunta
Melting point increases across a period
Respuesta
  • True
  • False

Pregunta 3

Pregunta
non-metals have a giant molecular structure meaning a lot of energy is required to break the bonds
Respuesta
  • True
  • False

Pregunta 4

Pregunta
Which two answers correctly describe electrical conductivity
Respuesta
  • electrical conductivity decreases down a group when they are conductable
  • electrical conductivity - made possible by ions or electrons that are not free to move
  • electrical conductivity across a period decreases overall
  • occurs in covalent bonds

Pregunta 5

Pregunta
Ionic radius decreases across the period until formation of the negative ions. Afterwards there is a sudden increase followed by a steady decrease to the end. Is this true or false?
Respuesta
  • True
  • False

Pregunta 6

Pregunta
Why does sulphur have a higher melting point than phosphorous?
Respuesta
  • there are higher intermolecular forces between sulphur than phosphorous
  • there are lower intermolecular forces between sulphur than phosphorous

Pregunta 7

Pregunta
Which physical property increases down a group but decreases across a period
Respuesta
  • Ionic radius
  • Atomic radius
  • Electronegativity

Pregunta 8

Pregunta
Why are there no values for atomic radius for noble gases? (two answers)
Respuesta
  • The atomic radius doesn't affect their nuclear charge
  • Nuclei distance is difficult to measure
  • They do not generally bond to other atoms

Pregunta 9

Pregunta
Which is the correct order of decreasing radii for Cl, Cl+, Cl- ?
Respuesta
  • Cl, Cl-, Cl+
  • Cl+, Cl, Cl-
  • Cl-, Cl+, Cl
  • Cl-. Cl, Cl+

Pregunta 10

Pregunta
What are the chemical properties of Group 0 (Noble gases)?
Respuesta
  • odour, colourless, mono atomic, reactive
  • odourless, colourless, mono atomic, unreactive
  • odourless, colour, not mono atomic, unreactive
  • odour, colour, not mono atomic, reactive

Pregunta 11

Pregunta
What are the chemical properties of Group 1 (alkali metals)?
Respuesta
  • reactivity increases down group, 1 electron in outer shell, form ionic compounds, doesn't conduct electricity, very reactive, low density
  • reactivity decreases down group, 1 electron in outer shell, form ionic compounds, doesn't conduct electricity, very reactive, low density
  • reactivity increases down group, 1 electron in outer shell, form ionic compounds, conducts electricity, very reactive, low density
  • reactivity increases down group, 2 electron in outer shell, doesn't conduct electricity, very reactive, low density

Pregunta 12

Pregunta
Halogens reactivity increases down a group, they form ionic compounds with metals or covalently with non-metals, have 6 in the outer shell, diotomic
Respuesta
  • True
  • False

Pregunta 13

Pregunta
There is no displacement reaction in this equation because Iodine is weaker than Bromine 2KBr + I2 ----->
Respuesta
  • True
  • False

Pregunta 14

Pregunta
What are the characteristics of chlorides? (tick three)
Respuesta
  • Na, Mg - alkaline
  • Al - amphoteric
  • Si, P, S, Cl - alkaline
  • Si, P, S, Cl - acidic
  • Na, Mg - acidic

Pregunta 15

Pregunta
'Increasing charge density of the positive ion polarises the chloride ion as we move to the right hand side'. Is this true?
Respuesta
  • True
  • False

Pregunta 16

Pregunta
Here is a list describing and explaining the melting point trend across period 3. Which one is INCORRECT
Respuesta
  • Na -----> Al = steady increase as there is an increase in the availability of electrons in the metallic bonding
  • Si = massive increase since Si has a giant macromolecular structure
  • P = slight increase due to as have only van der Waals forces between molecules whereas the others have giant structures; P4 molecule
  • S = small increase as have only van der Waals forces between molecules whereas the others have giant structures; S8 molecule
  • P= large decrease as have only van der Waals forces between molecules whereas the others have giant structures; P4 molecule
  • Cl ---> Ar = decrease as chlorine is a much smaller molecule with weaker van der Waals forces; argon is just a single atom = very weak van der Waals forces

Pregunta 17

Pregunta
Which oxides are insoluble in water?
Respuesta
  • Na2O
  • MgO
  • Al2O3
  • SiO2
  • P4O10 (or P4O6)
  • SO3 (or SO2)
  • Cl2O7 Cl2O

Pregunta 18

Pregunta
Which oxides DO NOT react with HCl?
Respuesta
  • Na2O
  • SO3 (OR SO2)
  • Al2O3
  • P4O10 (OR P4O6)
  • SiO2
  • MgO
  • Cl2O7 Cl2O

Pregunta 19

Pregunta
Which ones react when NaOH is added?
Respuesta
  • Na2O
  • MgO
  • SiO2
  • H3PO4
  • SO2
  • HCl2O7
  • Al2O3

Pregunta 20

Pregunta
Oxides in period 3 are either Basic Oxide, Amphoteric Oxide or Acidic Oxide
Respuesta
  • True
  • False

Pregunta 21

Pregunta
Which ones have a good conductivity? (3 answers)
Respuesta
  • Na2O
  • Al2O7
  • SiO2
  • P4O10
  • MgO
  • Cl2O7

Pregunta 22

Pregunta
Melting point in period 3 oxides increases Na2O --> MgO and then decreases from MgO ---> Cl2O7
Respuesta
  • True
  • False

Pregunta 23

Pregunta
Which chlorides across period 3 dissolves in water?
Respuesta
  • NaCl
  • Al2Cl6
  • SiCl4
  • MgCl2
  • PCl3
  • PCl5
  • Cl2

Pregunta 24

Pregunta
Melting point increases across period 3 chlorides
Respuesta
  • True
  • False

Pregunta 25

Pregunta
NaCl and MgCl2 are both good conductors and are ionic in nature whereas the rest in period 3 are covalent in nature and don't conduct. True or false?
Respuesta
  • True
  • False

Pregunta 26

Pregunta
Which definition of 1st Ionisation Energy and Electronegativity is correct?
Respuesta
  • 1st Ionisation Energy = minimum energy required to remove 1 mole of gaseous electrons from 1 mole of gaseous atoms Electronegativity = ability of an atom to attract electrons in a ionic bond
  • 1st Ionisation Energy = minimum energy required to remove 1 mole of gaseous electrons from 1 mole of gaseous atoms Electronegativity = ability of an atom to attract electrons in a covalent bond

Pregunta 27

Pregunta
An transition element is: an element that possesses an incomplete or sub-level in one or more of its oxidation states
Respuesta
  • True
  • False

Pregunta 28

Pregunta
Tick the correct properties of transition elements
Respuesta
  • Variable oxidation number
  • complex ion formation
  • Catalyst properties
  • Coloured complexes

Pregunta 29

Pregunta
Why are Sc and Zn not considered as transitional metals?
Respuesta
  • Sc not transition metal as its common ion Sc³⁺ has no d electrons
  • Zinc not transition metal as contains full d sub level in all oxidation states
  • Zinc not transition metal as contains has no full d sub level in all oxidation states

Pregunta 30

Pregunta
What is a ligand?
Respuesta
  • Species that uses a lone pair of electrons to form dative covalent bonds with a non-metal ion.
  • Species that possesses an incomplete or sub-level in one or more of its oxidation states
  • Species that uses a lone pair of electrons to form dative covalent bonds with a metal ion.
  • Species which is the arrangement showing the properties of elements repeat periodically

Pregunta 31

Pregunta
Why are some of the complexes of the d-block elements coloured?
Respuesta
  • energy difference between levels corresponds to particular wavelength of light
  • because they are
  • colour produced complement to wavelength absorbed when electrons excited.
  • electron transitions (electron jumps) from one orbital to another
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