7/29/2019 Atomic Spectra Ans

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1. (i) coloured / bright / rainbow / visible spectrum (background)(1);

black lines(1);

getting closer at higher frequency(1);

do not allow spectrum of light

allow getting closer at shorter / smaller / lower wavelengthORA3

(ii) black/dark background(1);

coloured/bright lines(1);

note: check above before awarding on this part for ecfs

e.g. a (i) may have got first two marking points wrong way

round (zero) but answered this part as a reverse argument

therefore scores two (effectively one mistake penalised in a (i)).

2[5]

2. (i) 1. F (1) and 2. E (1) respectively 2

(ii) Lines in exactly the same position (1); 1[3]

3. (i) frequency/energy (1) 1

(ii) emit light:- electrons raised to higher electronic levels (1); 5

electrons drop back to lower levels losing energy (as light)1

discrete lines:- energy levels quantized (AW)/drops give out a specific

amount of energy/drops between levels (1

relates to specific frequencies/ ()E=hu (1)

sets of lines:- each set represent drops to a different lower level/

mention of specific example eg Lyman (1)

Excited ATOMS/no mention of electrons max four marks

NB these points could be gained from an annotated diagram.

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7/29/2019 Atomic Spectra Ans

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(iii) Similarities lines (spectrum) (1);lines in same place/same 3

spacing/lines converge (1)

Difference black lines (on a bright background)

compared to coloured lines (on a black background) (1); [9]

4. (Coloured/bright/white) NOT black (con) lines (1); on a black/dark

background (1);lines getting closer (1) NOT bands

Diagram can get all marks but needs explanation or shading for first two 3[3]

5. (i) 1. F (1) and 2. E (1) respectively 2

(ii) Lines in exactly the same position/frequency/match up (1); 2

energy transitions/quanta same/(1);

(this second mark can be scored from diagram. But, treat diagrams with

different up/down arrows as neutral) (1)[4]

6. (a) Charged atom / group of atoms / moleculeor atom / group of atoms / molecule that has lost or gained electron(s)

NOT charged particle or specific ion (e.g. cation) 1

(b) arrow going up (1) from a definite lower level to higher one (1) 2

(c) arrow going down (1) (ignore positioning) 1

(d) (i) Diagram showing drop to different energy level (or in words) (1);Each set caused by a drop to a specific level (1) 2

(ii) Higher energy levels get closer / gaps become smaller

(must state or label diagram) (1);

Reference to frequency related to energy gap / E = hu /f (1) 2[8]

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