Advanced Higher Chemistry > Unit 1-Shape And Polyatomic molecules > Flashcards

Unit 1-Shape And Polyatomic molecules Flashcards

(21 cards)

Study These Flashcards
1
Q

What theory is used to predict molecular shapes?

A

Valence Shell Electron Pair Repulsion (VSEPR) theory

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the basic idea of VSEPR theory?

A

Electron pairs repel and arrange to maximise separation and minimise repulsion.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How do you calculate the number of electron pairs around a central atom?

A

Add valence electrons on the central atom + one per attached atom ± charge, then divide by 2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What do you do for a negative charge when calculating electron pairs?

A

Add one electron for each negative charge.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What do you do for a positive charge when calculating electron pairs?

A

Remove one electron for each positive charge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the electron‑pair arrangement for 2 electron pairs?

A

Linear

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the electron‑pair arrangement for 3 electron pairs?

A

Trigonal planar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the electron‑pair arrangement for 4 electron pairs?

A

Tetrahedral

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the electron‑pair arrangement for 5 electron pairs?

A

Trigonal bipyramidal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the electron‑pair arrangement for 6 electron pairs?

A

Octahedral

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What shape results from 3 electron pairs but only 2 bonding pairs?

A

Angular

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What shape results from 4 electron pairs but only 3 bonding pairs?

A

Trigonal pyramidal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What shape results from 6 electron pairs but only 5 bonding pairs?

A

Square pyramidal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the order of electron‑pair repulsions?

A

Lone pair–lone pair > lone pair–bonding pair > bonding pair–bonding pair

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What effect do lone pairs have on molecular shape?

A

They compress bond angles and distort the shape

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What shape is BeCl₂?

17
Q

What shape is H₂O?

18
Q

What shape is BF₃?

Study These Flashcards
A

Trigonal planar

19
Q

What determines the shape of a molecule or polyatomic ion?

Study These Flashcards
A

The positions of atoms based on electron‑pair arrangement

20
Q

What is the difference between electron‑pair geometry and molecular shape?

Study These Flashcards
A

Electron‑pair geometry includes lone pairs; molecular shape considers only bonded atoms

21
Q

Why do electron pairs adopt specific arrangements?

Study These Flashcards
A

To minimise repulsion and maximise separation

Advanced Higher Chemistry
flashcards
Decks in class (29)
# Cards
Brainscape helps you reach your goals faster, through stronger study habits.
© 2026 Bold Learning Solutions. Terms and Conditions