Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chemistry AS > Elements of Life - Molecular Structure > Flashcards

Elements of Life - Molecular Structure Flashcards

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

What is the bond angle for tetrahedral molecules?

A

109.5

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

Why is H2O a bent molecule?

A

It has 2 bonding and 2 non-bonding pairs of electrons.

They all repel to be as far apart as possible, but the non-bonding pairs repel stronger, therefore we get a bent shape with a 104.5 angle

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

What is the bond angle of a trignal planar molecule?

A

120

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

What is the bond angle of a linear molecule?

A

180

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

What is the bond angle of an octahedral molecule?

A

90

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

What are the bond angles for trignal bipyriamidal molecules?

A

90 and 120

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

What is the rule for calculating bond angles when a molecule has lone pairs of electrons?

A

reduced by 2.5 for every lone pair

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

If a molecule has 6 paired electrons what shape will it assume?

A

octahedral

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

If a molecule has 5 electron bonding pairs, what shape is it?

A

trignal bipyramidal

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

Which equation links moles, mass and relative atomic mass?

A

Moles = mass / molar mass

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

Define an emperical formula

A

the ratio of atoms is a compound

eg C2H6 would have be empirical formula of CH3

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

Define a molecular formula

A

The actual number of atoms in a molecule

eg C2H5OH would have the molecular formula of C2H6O

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

What is the general formula for percentage bymass?

A

atomic mass of elements in compound / atomic mass of compound

x 100

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

Define water of crystallisation

A

When H2O molecules are present inside crystals but not bonded within the structure

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

Define electronegativity

A

The tendency of an element to attract electrons in covalent bonds

17
Q

What determines whether a bond is ionic or covalent?

A

The differences of electronegativity between the elements

big difference -> ionic -> one can pull electrons a lot stronger

medium -> polar covalent

small -> covalent

18
Q

Which elements does aluminum only form ionic bonds with?

A

F and O

19
Q

Which group of elements will never form a covalent bond and why?

A

Group 1

they are too far apart from other elements

20
Q

List the properties of ionic compounds

A
  • > all solids at room temperature
  • > high melting and boiling points
  • > form giant ionic lattices
  • > conduct electricity when liquid or aqueous
  • > SOME dissolve in water but not all
21
Q

List the insoluble ionic compounds

A
  • > barium, lead, calcium and silver sulphates
  • > silver and lead halides
  • > metal carbonates
  • > metal hydroxides (excluding group 1 and ammonium)
22
Q

Define a dative covalent bond

A

When both bonding electron originate from the same atom

23
Q

What is the solubility of nitrate ions?

A

Always soluble in water

Chemistry AS (12 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions