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Exams & Certifications

Chemistry Quizzes , Questions & Answers

Recent Chemistry Quizzes

Elements and Atoms in Chemical Compounds

This assessment focuses on the composition of various chemical compounds, evaluating your understanding of atoms in molecules. Key concepts include identifying the number of specific atoms, such as Oxygen in Nitric Acid and...

Questions: 8 | Attempts: 13 | Last updated: Sep 14, 2026

Sample Question
How many atoms of Oxygen are in Nitric Acid (HNO₃)?

1 atom

2 atoms

3 atoms

4 atoms

Molecules and Their Types

This assessment focuses on molecules and their types, evaluating your understanding of monatomic, diatomic, and polyatomic molecules. It covers key concepts like molecular formulas and examples of different molecule types, making...

Questions: 8 | Attempts: 12 | Last updated: Sep 14, 2026

Sample Question
What is a molecule?

A large group of atoms physically mixed together

A small group of atoms chemically bonded together

A single atom existing independently

A group of molecules joined by heat

Elements, Atoms and Compounds

This assessment focuses on the fundamental concepts of elements, atoms, and compounds. It evaluates your understanding of pure substances, chemical combinations, and the differences between mixtures and compounds. Engaging with...

Questions: 8 | Attempts: 16 | Last updated: Sep 14, 2026

Sample Question
What is an element?

A pure substance made up of only one type of atom

A mixture of two or more substances

A substance formed by chemically combining two elements

A substance that can be broken down by physical means

Diffusion and Molecular Mass in Gases

This assessment focuses on diffusion and molecular mass in gases. Key concepts include the definition of diffusion, the states of matter, and how molecular mass affects diffusion rates. Understanding these principles is essential...

Questions: 8 | Attempts: 10 | Last updated: Sep 14, 2026

Sample Question
What is diffusion?

The movement of particles from low to high concentration

The net movement of particles from high to low concentration until equilibrium is reached

The movement of particles in a solid only

The stopping of particle movement at equilibrium

Chemical Formulas Basics

This assessment focuses on the basics of chemical formulas, evaluating your understanding of symbols, subscripts, and coefficients. You'll learn how to interpret chemical representations and their significance in chemistry. This...

Questions: 8 | Attempts: 12 | Last updated: Sep 13, 2026

Sample Question
What does a subscript in a chemical formula tell you?

The number of atoms of a particular element

The color of the element

The weight of the element

The temperature of the element

Chemical Formulas and Atomic Symbols

This assessment focuses on understanding chemical formulas and atomic symbols. It evaluates key concepts such as the representation of substances, the significance of subscripts and coefficients, and the identification of...

Questions: 8 | Attempts: 10 | Last updated: Sep 13, 2026

Sample Question
What does a chemical formula represent?

A substance and the number of atoms of each element

The color and texture of a substance

The temperature at which a substance melts

The weight of a molecule

Atomic Structure Isotopes and Atomic Mass

This assessment focuses on atomic structure, isotopes, and atomic mass. It evaluates your understanding of key concepts such as atomic mass units, the characteristics of isotopes, and the differences in atomic mass among...

Questions: 8 | Attempts: 15 | Last updated: Sep 13, 2026

Sample Question
What is the definition of 1 amu (atomic mass unit)?

1/10 the mass of one C-12 atom

1/12 the mass of one C-12 atom

1/6 the mass of one C-12 atom

The mass of one hydrogen atom

Atomic Structure Radioactivity and Atomic Mass

This assessment focuses on atomic structure, radioactivity, and atomic mass. It evaluates your understanding of concepts such as atomic numbers, isotopes, and the process of radioactive decay. Engaging with this material is...

Questions: 8 | Attempts: 10 | Last updated: Sep 13, 2026

Sample Question
An element has an atomic number of 17 and a mass number of 35. How many neutrons are in the nucleus of this atom?

17

18

35

52

Periodic Table: Ionisation Energy & Periodicity

This assessment focuses on ionisation energy and periodic trends in the periodic table. It evaluates understanding of key concepts such as factors affecting ionisation energy, electron affinity, electronegativity, and the...

Questions: 20 | Attempts: 10 | Last updated: Sep 13, 2026

Sample Question
What is the first ionisation energy?

Energy required to remove an electron from a gaseous atom

Energy released when an electron is added to a gaseous atom

Energy required to remove a proton from a nucleus

Energy released when two atoms bond together

Periodic Table Trends and Atomic Radii

This assessment focuses on atomic radius and periodic table trends. It evaluates understanding of concepts like effective nuclear charge, shielding, and ionic size. Mastering these topics is essential for grasping atomic behavior...

Questions: 30 | Attempts: 11 | Last updated: Sep 13, 2026

Sample Question
What is the definition of atomic radius?

The total distance between two atoms in a molecule

Half the distance between the nuclei of two identical atoms that are bonded together

The distance from the nucleus to the outermost electron shell

The diameter of an atom measured by X-ray diffraction

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