| Date | November 2011 | Marks available | 1 | Reference code | 11N.1.sl.TZ0.2 |
| Level | SL | Paper | 1 | Time zone | TZ0 |
| Command term | Solve | Question number | 2 | Adapted from | N/A |
Question
What is the sum of the coefficients when the following equation is balanced using whole numbers?
___ \({\text{F}}{{\text{e}}_2}{{\text{O}}_3}{\text{(s)}} + \) ___ \({\text{CO(g)}} \to \) ___ \({\text{Fe(s)}} + \) ___ \({\text{C}}{{\text{O}}_2}{\text{(g)}}\)
A. 5
B. 6
C. 8
D. 9
Markscheme
D
Examiners report
One respondent stated that the equation was a difficult choice to test the balancing of chemical equations. However, this type of question has been asked several times on previous papers and 59% of candidates got the correct answer, D. Candidates should be exposed to the balancing of some challenging equations as part of the teaching programme.
Syllabus sections
Core » Topic 1: Stoichiometric relationships » 1.1 Introduction to the particulate nature of matter and chemical change
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