Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
AS
CHEMISTRY
Paper 1 Inorganic and Physical Chemistry
Tuesday 22 May 2018 Morning Time allowed: 1 hour 30 minutes
Materials For Examiner’s Use
For this paper you must have:
• the Periodic Table/Data Sheet, provided as an insert (enclosed) Question Mark
• a ruler with millimetre measurements 1
• a scientific calculator, which you are expected to use where appropriate. 2
3
Instructions
• Use black ink or black ball-point pen. 4
• Fill in the boxes at the top of this page. 5
• Answer all questions.
6
• You must answer the questions in the spaces provided. Do not write outside
the box around each page or on blank pages. 7
• All working must be shown. 8
• Do all rough work in this book. Cross through any work you do not want to be 9
marked.
Section B
Information TOTAL
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 80.
Advice
• You are advised to spend about 65 minutes on Section A and 25 minutes on Section B.
*jun187404101*
IB/M/Jun18/E9 7404/1
, 2 Do not write
outside the
box
Section A
Answer all questions in this section.
0 1 This question is about atomic structure.
In the nineteenth century JJ Thomson discovered the electron. He suggested that
negative electrons were found throughout an atom like ‘plums in a pudding of positive
charge’.
Figure 1 shows an atom of element R using the ‘plum pudding’ model.
An atom of R contains seven electrons.
Figure 1
0 1 . 1 State two differences between the ‘plum pudding’ model and the model of atomic
structure used today.
[2 marks]
1
2
0 1 . 2 Deduce the full electron configuration of an atom of element R.
[1 mark]
0 1 . 3 Identify R and deduce the formula of the compound formed when R reacts with the
Group 2 metal in the same period as R.
[1 mark]
4
*02*
IB/M/Jun18/7404/1
, Do not write
3 outside the
box
0 2 This question is about sodium fluoride (NaF).
Some toothpastes contain sodium fluoride.
The concentration of sodium fluoride can be expressed in parts per million (ppm).
1 ppm represents a concentration of 1 mg in every 1 kg of toothpaste.
0 2 . 1 A 1.00 g sample of toothpaste was found to contain 2.88 x 10–5 mol of
sodium fluoride.
Calculate the concentration of sodium fluoride, in ppm, for the sample of toothpaste.
Give your answer to 3 significant figures.
[4 marks]
Concentration of sodium fluoridee pppm
Turn over ►
*03*
IB/M/Jun18/7404/1
Centre number Candidate number
Surname
Forename(s)
Candidate signature
AS
CHEMISTRY
Paper 1 Inorganic and Physical Chemistry
Tuesday 22 May 2018 Morning Time allowed: 1 hour 30 minutes
Materials For Examiner’s Use
For this paper you must have:
• the Periodic Table/Data Sheet, provided as an insert (enclosed) Question Mark
• a ruler with millimetre measurements 1
• a scientific calculator, which you are expected to use where appropriate. 2
3
Instructions
• Use black ink or black ball-point pen. 4
• Fill in the boxes at the top of this page. 5
• Answer all questions.
6
• You must answer the questions in the spaces provided. Do not write outside
the box around each page or on blank pages. 7
• All working must be shown. 8
• Do all rough work in this book. Cross through any work you do not want to be 9
marked.
Section B
Information TOTAL
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 80.
Advice
• You are advised to spend about 65 minutes on Section A and 25 minutes on Section B.
*jun187404101*
IB/M/Jun18/E9 7404/1
, 2 Do not write
outside the
box
Section A
Answer all questions in this section.
0 1 This question is about atomic structure.
In the nineteenth century JJ Thomson discovered the electron. He suggested that
negative electrons were found throughout an atom like ‘plums in a pudding of positive
charge’.
Figure 1 shows an atom of element R using the ‘plum pudding’ model.
An atom of R contains seven electrons.
Figure 1
0 1 . 1 State two differences between the ‘plum pudding’ model and the model of atomic
structure used today.
[2 marks]
1
2
0 1 . 2 Deduce the full electron configuration of an atom of element R.
[1 mark]
0 1 . 3 Identify R and deduce the formula of the compound formed when R reacts with the
Group 2 metal in the same period as R.
[1 mark]
4
*02*
IB/M/Jun18/7404/1
, Do not write
3 outside the
box
0 2 This question is about sodium fluoride (NaF).
Some toothpastes contain sodium fluoride.
The concentration of sodium fluoride can be expressed in parts per million (ppm).
1 ppm represents a concentration of 1 mg in every 1 kg of toothpaste.
0 2 . 1 A 1.00 g sample of toothpaste was found to contain 2.88 x 10–5 mol of
sodium fluoride.
Calculate the concentration of sodium fluoride, in ppm, for the sample of toothpaste.
Give your answer to 3 significant figures.
[4 marks]
Concentration of sodium fluoridee pppm
Turn over ►
*03*
IB/M/Jun18/7404/1
