Chemistry: Oxygen and Base Line

Write your name here
Surname

Other names

Centre Number

Candidate Number

Edexcel IGCSE

Chemistry

Unit: 4CH0
Science (Double Award) 4SC0
Paper: 1C
Wednesday 25 May 2011 – Morning
Time: 2 hours

Paper Reference

4CH0/1C
4SC0/1C

You must have:
Ruler
Candidates may use a calculator.

Total Marks

Instructions

black ink or
• Usein the boxesball-point pen. page with your name,
Fill
at the top of this
• centre number and candidate number. all
• Answer thequestions. in the spaces provided questions • Answermay be more space than you need. – there
• Show all the steps in any calculations and state the units.

Information

for
• The total markeachthis paper is 120. in brackets
The marks for question are shown
• – use this as a guide as to how much time to spend on each question.

Advice

Read carefully • Keep each questiontime. before you start to answer it.
• Write an eye on the neatly and in good English.
• Try toyour answers question.
• Checkanswer every if you have time at the end.
• your answers

P38731A
©2011 Edexcel Limited.

1/1/1/1/

*P38731A0132*

Turn over

2

*P38731A0232*

Answer ALL questions.
1 Atoms contain three different types of particle.

These are electrons, neutrons and protons.

(a) Which one of the three particles has a negative charge?

(1)

............................................ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(b) Which one of the three particles has the smallest mass?

(1)

............................................ . . . . . . . . . . . . . . . . . . . .