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candidate information
Candidate surnameOther names
Centre Number Candidate Number
Pearson Edexcel Level 3 GCE
Tuesday 16 May 2023
8CH0/01
Paper
Morning (Time: 1 hour 30 minutes)
reference
Chemistry
Advanced Subsidiary
PAPER 1: Core Inorganic and Physical Chemistry
You must have: Total Marks
Scientific calculator, Data Booklet, ruler
Instructions
•Use black ink or ball-point pen.
•IfFillpencil is used for diagrams/sketches/graphs it must be dark (HB or B).
•name,in the boxes at the top of this page with your
centre number and candidate number.
• Answer all
• Answer the questions in the spaces
provided – there may be more space
than you need.
questions.
Information
•The total mark for this paper is 80.
•The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
•For the question marked with an asterisk (*), marks will be
awarded for your ability to structure your answer logically,
showing the points that you make are related or follow on from
• each other where appropriate.
A Periodic Table is printed on the back cover of this paper.
Advice
•Read each question carefully before you start to answer it.
•whereallappropriate.
Show your working in calculations and include units
•the end. Check your answers if you have time at
Turn over
1
, Answer ALL questions.
Some questions must be answered with a cross in a box . If
you change your mind about an answer, put a line through the box
and then mark your new answer with a
cross .
1 Atoms of silicon contain protons, neutrons and electrons.
(a) Which are the correct data for a proton and a neutron?
(1)
Proton Neutron
Relative Relative mass Relative Relative mass
charge charge
A
+1 1 –1 0.0005
+1 1 0 1
B
–1 0.0005 0 1
0 1 +1 1
C
D
(b) (i) State the shape of the 2s orbital of a
silicon atom. (1)
, (c) Silicon has three stable isotopes.
A sample of silicon was found to have a relative atomic mass, Ar ,
of 28.11 due to the presence of only the three stable isotopes.
The abundance for two of the isotopes is given in the table.
Isotope Abundance /
%
28
Si 92.2
30
Si 3.1
Determine the relative isotopic mass of the third
stable isotope. You must show your working.
(2)
(d) Give the symbol, including the mass number and atomic number,
for an atom of element X that has four fewer protons and three
fewer neutrons than an atom of 28Si.
1
4 (1)
, 2 This question is about the double salt K2Mg(SO4)2.6H2O.
A double salt is a salt containing more than one cation or more
than one anion.
(a) (i) Give the reason why the term relative formula mass is
used, rather than relative molecular mass, when (1)
discussing K2Mg(SO4)2.6H2O.
(iii) What is the relative formula mass of
K2Mg(SO4)2.6H2O? Use the Periodic Table as
a source of data. (1)
A 206.0
B 322.7
C 402.7
D 595.3
(iv) Calculate the amount of substance, in mol, in 25.0 g of (1)
K2Mg(SO4)2.6H2O.
4
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