Brainscape's Knowledge GenomeTM

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


See full index

A2 Chemistry Unit 2 🌡️ > Definitions > Flashcards

Definitions Flashcards

You may prefer our related Brainscape-certified flashcards:
Periodic Table flashcards Chemistry 101 flashcards AP® Chemistry flashcards Organic Chemistry 101 flashcards
1
Q

Base peak

A

Peak of greatest abundance in a mass spectrum

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

Molecular ion peak

A

A peak produced by an ion formed by the removal of one electron from a molecule

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

M+1 peak

A

A peak produced by a molecular ion with an increased mass due to the presence of one carbon-13 atom

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

Fragmentation ion

A

A positively charged ion produced when the molecular ion breaks apart

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

Low resolution nmr

A

A spectrum which does not show the spin-spin splitting pattern

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

High resolution nmr

A

A spectrum which does show the spin-spin splitting pattern

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

Doublet

A

A signal which appears as a pair of lines of equal intensity

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

Triplet

A

A signal which appears as three lines in the approximate intensity ratio (1:2:1)

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

Quartet

A

A signal which appears as four lines in the approximate intensity ratio (1:3:3:1)

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

Back titration

A

Method where an excess of reagent is reacted with a sample. The unreacted reagent is then determined by titration

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

Rf values

A

Retardation factor, this is calculated using the expression
Rf= Distances moved by spot/ Distance moved by solvent

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

Retention time

A

The time taken from injection until a component reaches the detector

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

Transition metal

A

An element which forms at least one stable ion with a partially filled d-subshell

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

Complex

A

A central metal atom or ion with ligands bonded by co-ordinate bonds

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

Ligand

A

An ion or molecule with a lone pair of electrons which forms a co-ordinate bond with a central metal atom or ion in a complex

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

Co-ordination number

A

The number of co-ordinate bonds to a central metal atom or ion in a complex

17
Q

Monodentate

A

A ligand which uses only one lone pair of electrons to form a co-ordinate bond with a central metal atom or ion in a complex

18
Q

Bidentate

A

A ligand which uses two lone pairs of electrons to form two co-ordinate bonds with a central metal atom or ion in a complex

19
Q

Polydentate

A

A ligand which uses many lone pairs of electrons to form more than two co-ordinate bonds with a central metal atom or ion in a complex

20
Q

Standard electrode potential

A

The potential difference measured when a half-cell is connected to the standard hydrogen electrode under standard conditions

21
Q

e.m.f

A

The potential difference measured when two half-cells are connected

22
Q

Primary amine

A

Only one carbon atom directly bonded to the nitrogen atom and therefore has the (-NH2) group

23
Q

Secondary amine

A

Two carbon atoms directly bonded to the nitrogen atom, ie |
—NH

24
Q

Tertiary amine

A

Three carbon atoms directly bonded to the nitrogen atom ie. |
—N
|

25
Q

Coupling

A

A reaction in which two benzene rings are linked together through an azo (-N=N-) group

26
Q

Dehydration of amides

A

A reaction which involves the elimination of water from the amide

27
Q

Zwitterions

A

Ions which have a permanent positive and negative charge but which are neutral overall

28
Q

Primary structure (proteins)

A

Sequence of amino acids joined by peptide links in the chain

29
Q

Secondary structure (protein)

A

The twisting/coiling of the chain to form a Beta-pleated sheet/ alpha-helix by intramolecular hydrogen bonding

30
Q

Tertiary structure (protein)

A

The bending/folding of secondary structure to give a precise 3D shape held together by hydrogen bonding/disulfide bridges/ionic interactions/van der Walls’ forces

31
Q

Enzyme

A

A protein which is a biological catalyst

32
Q

Active site

A

The site on the surface of the enzyme into which the substrate fits

33
Q

Induced fit

A

The substrate induces a change of shape of the active site of the enzyme

34
Q

Condensation polymers

A

Polymers formed by the elimination of small molecules such as water or hydrogen chloride when monomers bond together

35
Q

Biodegradable polymer

A

A polymers which can be hydrolysed by the action of microorganisms

36
Q

DNA replication

A

The process by which a double stranded DNA molecule is copied to produce two identical DNA molecules

37
Q

GLC-MS

A

A gas liquid chromatography attached to a mass spectrometer

38
Q

Sequestering

A

The formation of a complex so that an ion is no longer available for reactions

A2 Chemistry Unit 2 🌡️ (1 decks)

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