Question 1

Which of the following best describes the process of electrolysis in the context of electrochemistry?
Correct answer: A process where an electric current is used to drive a non-spontaneous chemical reaction.

Accepted Answer

A process where an electric current is used to drive a non-spontaneous chemical reaction.

Question 2

A student is given 12 g of carbon (C, molar mass = 12 g/mol). How many moles of carbon does the student have?
Correct answer: 1 mole

Accepted Answer

1 mole

Question 3

Which of the following is a correct example of a chemical reaction as represented by the general equation Reactants → Products?
Correct answer: 2H2 (g) + O2 (g) → 2H2O (l)

Accepted Answer

2H2 (g) + O2 (g) → 2H2O (l)

Question 4

Which of the following best explains why metals are good conductors of electricity?
Correct answer: They have loosely bound electrons that can move freely.

Accepted Answer

They have loosely bound electrons that can move freely.

Question 5

A laboratory experiment requires you to safely dilute concentrated sulfuric acid. Which of the following is the correct and safe procedure?
Correct answer: Add acid to water slowly while stirring.

Accepted Answer

Add acid to water slowly while stirring.

Question 6

Which of the following statements about the Periodic Table is correct?
Correct answer: Elements in the same group have the same number of valence electrons.

Accepted Answer

Elements in the same group have the same number of valence electrons.

Question 7

A student is analyzing a sample of water for purity. Which experimental technique would be most appropriate for determining if the water contains dissolved salts?
Correct answer: Evaporation to dryness

Accepted Answer

Evaporation to dryness

Question 8

Which of the following best describes an exothermic reaction?
Correct answer: A reaction that releases heat to the surroundings.

Accepted Answer

A reaction that releases heat to the surroundings.

Question 9

Which of the following is a real-world example of the application of stoichiometry?
Correct answer: Calculating the amount of fertilizer needed for a crop based on the chemical composition of the soil.

Accepted Answer

Calculating the amount of fertilizer needed for a crop based on the chemical composition of the soil.

Question 10

A solution of hydrochloric acid (HCl) is neutralized by sodium hydroxide (NaOH). Which type of chemical reaction is this?
Correct answer: Neutralization

Accepted Answer

Neutralization

Question 11

Which of the following best illustrates the importance of safe laboratory practice?
Correct answer: Wearing safety goggles to protect eyes from chemical splashes.

Accepted Answer

Wearing safety goggles to protect eyes from chemical splashes.

Question 12

Which of the following is NOT a transferable skill emphasized by the IGCSE Chemistry syllabus?
Correct answer: Memorizing historical dates

Accepted Answer

Memorizing historical dates

Question 13

A student is given a mixture of sand and salt. Which sequence of experimental techniques should be used to separate and recover both substances?
Correct answer: Dissolve in water, filter, evaporate the filtrate.

Accepted Answer

Dissolve in water, filter, evaporate the filtrate.

Question 14

Which of the following best describes the role of curiosity in scientific investigation, as encouraged by the syllabus?
Correct answer: It motivates students to ask questions and explore new ideas.

Accepted Answer

It motivates students to ask questions and explore new ideas.

Question 15

Which of the following is a correct application of the mole concept in a real-life scenario?
Correct answer: Determining the number of molecules in a given mass of glucose for a medical IV solution.

Accepted Answer

Determining the number of molecules in a given mass of glucose for a medical IV solution.

Question 16

Which of the following best demonstrates the use of scientific terminology and conventions in communication?
Correct answer: Describing water as H2O in a chemical equation.

Accepted Answer

Describing water as H2O in a chemical equation.

Question 17

A chemical reaction has the following balanced equation: 2Na + Cl2 → 2NaCl. If you start with 4 moles of sodium (Na), how many moles of sodium chloride (NaCl) will be produced?
Correct answer: 4 moles

Accepted Answer

4 moles

Question 18

Which of the following environmental issues is most directly related to the chemistry of the atmosphere?
Correct answer: Acid rain formation due to sulfur dioxide emissions.

Accepted Answer

Acid rain formation due to sulfur dioxide emissions.

Question 19

Which of the following is an example of an organic compound?
Correct answer: Methane (CH4)

Accepted Answer

Methane (CH4)

Question 20

A student is asked to evaluate the reliability of data collected during a titration experiment. Which of the following should the student consider?
Correct answer: Whether the measurements were repeated and consistent.

Accepted Answer

Whether the measurements were repeated and consistent.

Overview of Cambridge IGCSE Chemistry 0620 Syllabus

Study Guide - Practice Questions

Study Guide - Flashcards