Question 1

Which of the following best describes the main purpose of stoichiometry in chemical reactions?
Correct answer: To calculate the quantities of reactants and products involved in a chemical reaction

Accepted Answer

To calculate the quantities of reactants and products involved in a chemical reaction

Question 2

A student is asked to prepare 250 mL of a 0.2 mol/dm³ NaCl solution. What mass of NaCl (M = 58.5 g/mol) is required?
Correct answer: 2.93 g

Accepted Answer

2.93 g

Question 3

Which of the following statements about acids, bases, and salts is correct?
Correct answer: Bases react with acids to form salts and water

Accepted Answer

Bases react with acids to form salts and water

Question 4

During an experiment, a student observes that a metal reacts with hydrochloric acid to produce a gas and a colorless solution. Which gas is most likely produced?
Correct answer: Hydrogen

Accepted Answer

Hydrogen

Question 5

Which of the following best explains why ionic compounds generally have high melting points?
Correct answer: They are made up of ions held together by strong electrostatic forces

Accepted Answer

They are made up of ions held together by strong electrostatic forces

Question 6

A sample of gas occupies 500 cm³ at 27°C. If the temperature is increased to 127°C at constant pressure, what will be the new volume? (Assume ideal gas behavior.)
Correct answer: 667 cm³

Accepted Answer

667 cm³

Question 7

Which of the following is a correct application of the equation n = m/M?
Correct answer: Determining the number of moles from a given mass and molar mass

Accepted Answer

Determining the number of moles from a given mass and molar mass

Question 8

A student is given a mixture of sand and salt. Which experimental technique should be used to separate the salt from the sand after dissolving the mixture in water?
Correct answer: Filtration

Accepted Answer

Filtration

Question 9

Which of the following best describes the role of the Periodic Table in modern chemistry?
Correct answer: It organizes elements based on atomic number and recurring chemical properties

Accepted Answer

It organizes elements based on atomic number and recurring chemical properties

Question 10

Which of the following is an example of a redox reaction relevant to environmental chemistry?
Correct answer: Combustion of fossil fuels producing carbon dioxide

Accepted Answer

Combustion of fossil fuels producing carbon dioxide

Question 11

A solution contains 0.5 moles of solute in 2.0 dm³ of solution. What is the concentration of the solution?
Correct answer: 0.25 mol/dm³

Accepted Answer

0.25 mol/dm³

Question 12

Which property is most useful for distinguishing between metals and non-metals in the laboratory?
Correct answer: Ability to conduct electricity

Accepted Answer

Ability to conduct electricity

Question 13

Which of the following best illustrates the application of independent thinking in a chemistry laboratory?
Correct answer: Designing a new experiment to test a hypothesis

Accepted Answer

Designing a new experiment to test a hypothesis

Question 14

A student is analyzing a sample and needs to determine the presence of chloride ions. Which chemical test should be used?
Correct answer: Add silver nitrate solution; a white precipitate indicates chloride ions

Accepted Answer

Add silver nitrate solution; a white precipitate indicates chloride ions

Question 15

Which of the following is a key transferable skill emphasized by the IGCSE Chemistry syllabus?
Correct answer: Problem-solving and analysis

Accepted Answer

Problem-solving and analysis

Question 16

Which of the following best describes the process of electrolysis?
Correct answer: The decomposition of a compound using electricity

Accepted Answer

The decomposition of a compound using electricity

Question 17

A student is asked to explain why water is considered a compound and not a mixture. Which explanation is correct?
Correct answer: Water is formed by a chemical combination of hydrogen and oxygen in a fixed ratio

Accepted Answer

Water is formed by a chemical combination of hydrogen and oxygen in a fixed ratio

Question 18

Which of the following is a real-world application of chemical energetics?
Correct answer: Calculating the energy released when gasoline combusts in a car engine

Accepted Answer

Calculating the energy released when gasoline combusts in a car engine

Question 19

Which of the following best demonstrates the use of scientific terminology and conventions in communication?
Correct answer: Writing the balanced chemical equation for the reaction

Accepted Answer

Writing the balanced chemical equation for the reaction

Question 20

A student is given a sample of an unknown organic compound. Which technique would be most appropriate for determining its functional groups?
Correct answer: Infrared spectroscopy

Accepted Answer

Infrared spectroscopy

Overview of Cambridge IGCSE Chemistry 0620 Syllabus

Study Guide - Practice Questions

Study Guide - Flashcards