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CSEE (Form 4) Chemistry — practice by topic

Browse 106 questions across 63 Chemistry topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Chemistry topics

Organic Chemistry (31)Alcohols Phenols Ethers (28)Aldehydes Ketones (28)Alkenes (28)Chemical Bonding (28)Chemical Bonding and Molecular Structure (28)Chemical Equilibrium (28)Classification of Elements (28)Classification of Elements and Periodicity (28)Hydrogen (28)p-Block Elements (28)p-Block Elements (Groups 15-18) (28)Periodic Classification (28)Periodic Classification of Elements (28)Polymers (28)Reactions in Aqueous Solution (28)S Block Elements (28)Solid State (28)States of Matter (28)Surface Chemistry (28)The Atom (28)The d- and f-Block Elements (28)The p-Block Elements (28)Atomic Structure (27)The Periodic Table (26)Alcohols, Phenols and Ethers (24)Aldehydes, Ketones and Carboxylic Acids (24)Amines (24)Atomic Structure and Valency (24)Atoms and Molecules (24)Classification of Elements and Periodicity in Properties (24)d- and f-Block Elements (24)Electrochemical Series (24)Equilibrium (24)Equilibrium Constant (24)Equipotential Surfaces (24)Haloalkanes and Haloarenes (24)Hydrocarbons (24)Ideal and Non-Ideal Solutions (24)Ideal Solutions (24)Non-Ideal Solutions (24)Organic Chemistry: Some Basic Principles and Techniques (24)Periodic Table (24)Periodic Trends (24)Redox & Electrochemistry (24)Redox Reactions (24)Some Basic Concepts of Chemistry (24)Surface Areas and Volumes (24)Surface Tension (24)Air, Combustion, Rusting and Fire Fighting (10)Chemical Formulae and Equations (9)Matter (8)Classification of Matter (7)Fuels and Energy (4)Physical and Chemical Change (4)Non-Metals and Their Compounds (3)Representing Chemical Change (3)Soil Chemistry (3)Water (3)Laboratory Techniques and Safety (2)

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Two substances are combined but stay unbonded and no reaction happens between them. What has been made?Read the answer and worked solution →What is the movement of particles from a high concentration to a low concentration called?Read the answer and worked solution →What does the atomic number of an element count?Read the answer and worked solution →On the periodic table, what is a vertical column of elements called?Read the answer and worked solution →

Worked practice questions

Two substances are combined but stay unbonded and no reaction happens between them. What has been made?

  1. A mixture
  2. A compound
  3. An element
  4. A molecule
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Correct answer: A. A mixture

1. Sand stirred into water is a good picture of what is happening here. 2. A mixture is a combination of two or more substances that are not bonded to each other, with no chemical reaction between them. 3. In a compound the elements are joined in a fixed ratio, which is not the case here. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 2: Classification of matter_

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What is the movement of particles from a high concentration to a low concentration called?

  1. Sublimation
  2. Diffusion
  3. Condensation
  4. Evaporation
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Correct answer: B. Diffusion

1. A drop of food colouring slowly spreads out through a glass of water. 2. Diffusion is the movement of particles from a high concentration to a low concentration. 3. This spreading only happens because matter is made of particles that keep moving. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 3: States of matter and the kinetic molecular theory_

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What does the atomic number of an element count?

  1. Its neutrons
  2. Its nucleons
  3. Its protons
  4. Its molecules
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Correct answer: C. Its protons

1. The chemical properties of an element are set by the charge of its nucleus. 2. That charge comes from the protons, so the count of protons is called the atomic number. 3. The atomic number is written as Z and is the number that orders the periodic table. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 4: The atom_

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