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Quizzes > Quizzes for Business > Education

Take the IGCSE Chemistry Revision Quiz

Challenge Yourself with 15 Chemistry Questions

Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art displaying elements for IGCSE Chemistry Revision Quiz

Ready to ace your IGCSE chemistry revision? This 15-question practice quiz covers core topics from atomic structure to chemical bonding and reaction types, tailored for exam prep. Perfect for students seeking a quick concept check or a thorough review before tests. Try the Chemistry Knowledge Assessment Quiz , review fundamentals with the Chemistry Fundamentals Quiz, or explore more quizzes to diversify your study plan. You can freely edit questions and customize this quiz in our editor for personalized learning.

What is the chemical formula for sodium chloride?
NaCl
NaCl2
Na2Cl
KCl
Sodium chloride is formed by the ionic combination of Na❺ and Cl❻ ions, giving the formula NaCl. Other formulas listed do not represent the correct 1:1 ratio of sodium to chlorine ions.
What coefficient should be placed before H2 to balance the equation H2 + O2 -> H2O?
2
1
3
4
The balanced equation is 2H2 + O2 -> 2H2O, so the coefficient before H2 is 2. This ensures equal numbers of hydrogen and oxygen atoms on both sides.
Which element has the atomic number 6?
Carbon
Oxygen
Nitrogen
Phosphorus
Element atomic number 6 corresponds to carbon, which has six protons in its nucleus. Oxygen is atomic number 8 and nitrogen is 7.
What is the chemical symbol for potassium?
K
P
Po
Pt
Potassium has the chemical symbol K derived from its Latin name 'kalium'. P is phosphorus, Po is polonium, and Pt is platinum.
Which gas is produced when hydrochloric acid reacts with magnesium?
Hydrogen
Chlorine
Oxygen
Carbon dioxide
When hydrochloric acid reacts with magnesium, Mg + 2HCl -> MgCl2 + H2, hydrogen gas is released. No chlorine, oxygen, or carbon dioxide is liberated in this reaction.
What is the molar mass of sulfuric acid, H2SO4, in g/mol?
98
100
82
72
Molar mass of H2SO4 is calculated as 2×1 (H) + 32 (S) + 4×16 (O) = 98 g/mol. Other values do not match the sum of atomic masses.
Which of the following compounds is predominantly covalently bonded?
Carbon dioxide
Sodium chloride
Calcium oxide
Magnesium chloride
Carbon dioxide consists of nonmetals bonded by shared electron pairs, making it covalent. The others are ionic compounds formed by metal - nonmetal bonding.
In the reaction Fe2O3 + 3CO -> 2Fe + 3CO2, what type of reaction occurs?
Redox
Acid - base
Precipitation
Neutralisation
This reaction involves transfer of electrons: iron(III) is reduced to iron and carbon monoxide is oxidised to carbon dioxide, classifying it as a redox reaction.
How many electrons are present in the third shell (n=3) of a phosphorus atom (atomic number 15)?
5
2
8
10
Phosphorus has electron configuration 2,8,5; thus there are 5 electrons in the third shell. The first two shells hold 2 and 8 electrons respectively.
Which property generally increases across a period in the periodic table?
Ionisation energy
Atomic radius
Metallic character
Density
Across a period, effective nuclear charge increases, making it harder to remove electrons, so ionisation energy increases. Atomic radius and metallic character decrease.
What is the concentration in mol/L of a solution containing 5 moles of solute in 2 liters of solution?
2.5
0.4
5
10
Concentration (M) = moles of solute/volume of solution in liters = 5 mol / 2 L = 2.5 M. Other values do not match this calculation.
What type of chemical reaction is represented by H2SO4 + 2NaOH -> Na2SO4 + 2H2O?
Neutralisation
Combustion
Redox
Precipitation
An acid (H2SO4) reacting with a base (NaOH) to form salt and water is a neutralisation reaction. No oxidation or precipitation occurs here.
What is the empirical formula of a compound containing 40% sulfur and 60% oxygen by mass?
SO3
SO2
S2O3
S3O
Assuming 100 g sample gives 40 g S (1.25 mol) and 60 g O (3.75 mol). Dividing by 1.25 gives mole ratio S:O = 1:3, so empirical formula SO3.
In the reaction 2Al + 3Cl2 -> 2AlCl3, how many moles of Cl2 are required to completely react with 5 moles of Al?
7.5
5
10
2.5
Stoichiometry: 2 Al react with 3 Cl2, so ratio Cl2/Al = 3/2. For 5 mol Al, Cl2 needed = 5 × (3/2) = 7.5 mol.
Which of the following is a transition metal?
Iron
Sodium
Chlorine
Neon
Iron is located in the d-block of the periodic table and is classified as a transition metal. Sodium is an alkali metal, chlorine is a halogen, neon is a noble gas.
In the redox reaction 2KMnO4 + 10FeSO4 + 8H2SO4 -> K2SO4 + 2MnSO4 + 5Fe2(SO4)3 + 8H2O, which species acts as the oxidising agent?
MnO4-
Fe2+
SO42-
H+
Permanganate ion (MnO4-) gains electrons and is reduced to Mn2+, thus acting as the oxidising agent. Iron(II) is oxidised in the process.
Calculate the mass of CO2 produced when 10 g of CH4 is burned completely. (C=12, H=1, O=16)
27.5 g
35.0 g
22.0 g
17.5 g
Moles CH4 = 10/16 = 0.625. Reaction yields 1 mol CO2 per mol CH4, so CO2 mass = 0.625 × 44 = 27.5 g. Other values are incorrect.
Which explanation best accounts for the decrease in first ionisation energy down Group 2?
Increased atomic radius and greater electron shielding
Increased nuclear charge
Fewer electron shells
Stronger attraction between nucleus and electrons
Down Group 2, additional electron shells increase shielding and distance from nucleus, reducing the energy required to remove an electron. Nuclear charge increases but is outweighed by shielding.
An element has two isotopes: mass 63 (69.17%) and mass 65 (30.83%). What is its relative atomic mass?
63.62
64.00
63.30
64.38
Relative atomic mass = 63×0.6917 + 65×0.3083 = 43.57 + 20.05 = 63.62. Other values do not match the weighted average calculation.
What is the oxidation number of nitrogen in HNO3?
+5
+3
+1
+4
In HNO3, H is +1 and O is -2×3 = -6. The sum must be zero, so N = +5. Other oxidation states do not satisfy the overall neutrality.
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Learning Outcomes

  1. Analyse chemical formulas and equations accurately.
  2. Identify properties of key elements and compounds.
  3. Apply knowledge of reaction types to solve problems.
  4. Demonstrate understanding of atomic structure concepts.
  5. Evaluate periodic table trends and element behaviours.
  6. Master stoichiometric calculations in quantitative questions.

Cheat Sheet

  1. Mastering Chemical Equations - Dive into the art of writing and balancing chemical equations with confidence! This foundational skill will help you visualize how atoms reorganize during reactions and predict products like a pro. Ready to sharpen your skills? Writing Equations Revision Notes IGCSE Chemistry
  2. Periodic Table Patterns - Get to know the periodic table inside out and discover the hidden trends that govern element behavior. Spotting patterns like electronegativity and atomic radius will make predicting reactions feel like solving a stylish puzzle. Learn more here: IGCSE Chemistry Revision Notes
  3. Understanding Moles & Avogadro's Number - Unlock the key to quantitative chemistry by mastering the mole concept. Relate masses to particle counts and perform stoichiometric calculations without breaking a sweat. Your journey to number-crunching greatness starts here: Quantitative Chemistry Revision Help
  4. Chemical Bonding Basics - Explore the three bonding superheroes: ionic, covalent, and metallic. Learn how the type of bond influences melting points, conductivity, and many more cool properties of compounds. Plot twist: it's all about electron sharing or transfer! Check it out: Chemistry Revision Slides - IGCSE
  5. Empirical & Molecular Formulas - Crack the code on experimental data to find the simplest element ratio (empirical formula) and the actual molecule make-up (molecular formula). This detective work turns lab results into clear chemical identities. Sleuth through the details here: Stoichiometry Revision Notes - IGCSE CIE
  6. Relative Formula Mass Calculations - Become a whiz at calculating relative formula masses using atomic masses from the periodic table. This essential skill underpins all your stoichiometry adventures and ensures you nail your quantitative problems. Practice makes perfect: Quantitative Chemistry Revision Help
  7. Principles of Electrolysis - Step into the world where electricity meets chemistry! Understand how ions migrate to electrodes, causing exciting redox transformations and even metal plating. Power up your knowledge with this guide: IGCSE Chemistry Revision Notes
  8. Reactivity Series of Metals - Rank metals from most reactive to least reactive and predict which metal will push another out of a solution. This handy chart is your cheat sheet for displacement reactions and extraction methods. Get the lowdown: Reactivity Series Study Guide
  9. Acids, Bases & Salts - Journey through pH scales, neutralization reactions, and salt formations with flair. Understand how acid - base titrations reveal concentration secrets and why some salts fizz while others stay calm. Dive deeper: IGCSE Chemistry Revision Notes
  10. Organic Chemistry Fundamentals - Get acquainted with functional groups, isomers, and simple organic reactions that form the backbone of life's molecules. This engaging overview will set you up for more advanced topics in no time. Explore more: Organic Chemistry Basics
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