The energy change for the reaction Al(g) --> Al3+(g) is equal to

The 1st + 2nd + 3rd ionisation energy of Al

Which of the following is not a correct explanation for the trend of melting points of the halogens?

The mp increases as more energy is required to break strong covalent bonds

The covalent radius of potassium is greater than the covalent radius of lithium because

the screening of nuclear charge is greater in potassium than it is lithium

Why does hydrogen have a low melting and boiling point?

it has weak forces between the molecules

Why is the second ionisation of lithium higher than the first ionisation energy?

An electron is being removed from a shell closer to the nucleus

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Higher Chemistry - Periodicity and Bonding in the First 20 Elements

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Answers

1
The energy change for the reaction Al(g) --> Al³⁺(g) is equal to
The 1st and 3rd ionisation energy of Al
The 3rd - (2nd + 1st) ionisation of Al
The third ionisation energy of Al
The 1st + 2nd + 3rd ionisation energy of Al
2
The energy change in kJmol^-1 for the following reaction is Mg(g)-->Mg²⁺(g)+ 2e^-
+2189
+1451
-1451
-2189
3
Which of the following is not a correct explanation for the trend of melting points of the halogens?
The molecules with most electrons have the strongest intermolecular forces
The force of attraction between molecules increases going down the group
The LDF increases as the molecular mass increases
The mp increases as more energy is required to break strong covalent bonds
4
The covalent radius of potassium is greater than the covalent radius of lithium because
there's a greater attraction between the potassium nucleus and electrons
lithium is more reactive than potassium
Potassium has a higher nuclear charge
the screening of nuclear charge is greater in potassium than it is lithium
5
Which element from the second period exists as a covalent network?
Lithium
carbon
oxygen
fluorine
6
What is the formula of the phosphorous molecule?
P8
P3
P2
P4
7
Which type of bonding is never found in elements?
Ionic
London Dispersion Forces
Covalent
metallic
8
An element with a mp of >1000^oC doesn't conduct electricity and forms a compound with oxygen that has an mp of >1000^oC.
carbon
iron
phosphorous
silicon
9
The energy change in kJmol^-1 for the following reaction is Al⁴⁺(g) + 2e^- --> Al²⁺(g)
-14322
+14322
+4562
-4562
10
Why is there a decrease in the size of atoms across the period from aluminium to sulfur?
increasing number of electrons
decreasing number of electrons
decreasing number of protons
increasing number of protons
11
Why does hydrogen have a low melting and boiling point?
it has weak covalent bonds
it has weakly held outer electrons
it has weak ionic bonds
it has weak forces between the molecules
12
Which word would be used to describe the structure of Neon?
Network
Monatomic
Metallic lattice
Diatomic molecule
13
Why is the second ionisation of lithium higher than the first ionisation energy?
An electron is being added to a shell further away from the nucleus
An electron is being removed from a shell closer to the nucleus
An electron is being removed from a shell further away from the nucleus
An electron is being added to a shell closer to the nucleus
14
Which of the following represents the third ionisation energy of calcium?
Ca(s) --> Ca+(aq) + e-
Ca(g) --> Ca+(g) + e-
Ca(s) --> Ca3+(aq) + e-
Ca(g) --> Ca3+(g) + e-
15
Which type of bonding is only found in elements?
Ionic
Covalent
metallic
London Dispersion Forces

Higher Chemistry - Periodicity and Bonding in the First 20 Elements Flashcards | StudBud