IGCSE Stoichiometry General Skills Assessment

Stoichiometry Skills Assessment

1. What is the formula for water?

A) CO2
B) H2O
C) NaCl
D) O2

2. What does the molecular formula C6H12O6 tell us about glucose?

A) Contains carbon, hydrogen, and oxygen in a 1:2:1 ratio
B) Six carbon, twelve hydrogen, and six oxygen atoms per molecule
C) Six molecules of carbon dioxide and water
D) A and B are correct

3. Which of the following correctly represents the combustion of methane (CH4)?

A) CH4 + O2 → CO2 + H2O
B) CH4 + 2O2 → CO2 + 2H2O
C) 2CH4 + O2 → 2CO2 + 2H2O
D) CH4 + 2O2 → 2CO2 + 2H2O

4. A compound with 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass has an empirical formula of:

A) CH2O
B) C2H4O2
C) C6H12O6
D) CO2

5. Relative atomic mass (Ar) is defined as:

A) The mass of an atom relative to hydrogen
B) The mass of an atom relative to carbon-12
C) The sum of protons and neutrons
D) None of the above

6. If 24 g of magnesium reacts with 16 g of oxygen, how much magnesium oxide will be produced if the reaction goes to completion?

A) 40 g
B) 32 g
C) 24 g
D) None of these

7. How many molecules are there in 2 moles of CO2?

A) 6.02 × 10^23
B) 12.04 × 10^23
C) 18.06 × 10^23
D) 24.08 × 10^23

8. Balance the following chemical equation: Al + HCl → AlCl₃ + H₂

A) 2Al + 6HCl → 2AlCl₃ + 3H₂
B) 2Al + 6HCl → 3AlCl₂ + 3H₂
C) Al + 3HCl → AlCl₃ + H₂
D) Al + 3HCl → AlCl₂ + 2H₂

9. What volume of CO₂ gas at r.t.p. can be produced from the complete combustion of 24 grams of carbon?

A) 22.4 dm³
B) 44.8 dm³
C) 33.6 dm³
D) 11.2 dm³

10. 50.0 cm³ of 0.1 M HCl is exactly neutralized by 25.0 cm³ of a NaOH solution. What is the concentration of the NaOH solution?

A) 0.05 M
B) 0.20 M
C) 0.10 M
D) 0.25 M

How to Use Your Assessment Results

After completing the quiz, use the table below to identify which areas you need to focus on based on your answers. For each question you got wrong, find the corresponding question number in the table to see the subtopic and focus area. This will help you target your study efforts effectively.

Which Parts You Need To Stress On After The Assessment ?

Question Number	Subtopic	Focus Area
1	Formulae of Elements and Compounds	Understanding basic chemical formulae
2	Molecular Formula	Interpreting molecular formulae
3	Constructing Word and Symbol Equations	Writing and balancing chemical equations
4	Empirical Formula	Calculating empirical formulae
5	Relative Atomic Mass	Understanding relative atomic mass
6	Reacting Masses	Calculating reactants and products mass
7	Avogadro’s Constant	Using Avogadro's constant
8	Balancing Chemical Equations	Balancing complex equations
9	Volume Calculations at r.t.p.	Calculating gas volumes
10	Titration and Concentration Calculations	Titration and solution calculations

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