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Exams & Certifications

Chemistry Quizzes , Questions & Answers

Recent Chemistry Quizzes

This assessment focuses on the properties and structure of matter, evaluating understanding of atomic structure, chemical changes, and physical properties. It is relevant for learners aiming to grasp fundamental concepts in...

Questions: 8 | Attempts: 11 | Last updated: Oct 7, 2026

Sample Question
An atom of gold has an atomic number of 79 and a mass number of 197. How many neutrons does a gold atom contain?

79

197

118

276

Chemical Reactions and Household Chemistry

This assessment covers essential concepts in chemical reactions and household chemistry. It evaluates your understanding of chemical processes, reactions involving acids and bases, and the safety practices for using household...

Questions: 25 | Attempts: 12 | Last updated: Oct 7, 2026

Sample Question
What is a chemical reaction?

A process where substances change their physical state only

A process where one or more substances are transformed into new substances

A process where substances are mixed without any change

A process where substances are separated by filtration

Chemical Reactions Exchange and Combustion

This assessment focuses on chemical reactions, specifically double displacement and combustion. It evaluates understanding of key concepts such as reaction types, energy release, and the role of reactants. Mastering these topics...

Questions: 30 | Attempts: 10 | Last updated: Oct 6, 2026

Sample Question
What does a double displacement (exchange) reaction involve?

Two substances combining to form one product

Exchange of ions or elements forming two new compounds

A single substance breaking down into simpler substances

One element replacing another in a compound

Pure Substances Matter and Atomic Structure

This assessment focuses on pure substances, matter classification, and atomic structure. It evaluates understanding of elements, molecules, and their identities. This knowledge is essential for grasping fundamental chemistry...

Questions: 8 | Attempts: 11 | Last updated: Oct 6, 2026

Sample Question
Which of the following describes a pure substance composed of one kind of atom?

Compound

Mixture

Element

Solution

Stoichiometry and Chemical Reactions

This assessment focuses on stoichiometry and chemical reactions, evaluating your understanding of balanced equations, limiting reactants, and percent yields. It covers key concepts such as mole ratios and theoretical yields,...

Questions: 10 | Attempts: 10 | Last updated: Oct 6, 2026

Sample Question
In the combustion of octane, what is the balanced chemical equation?

2 C8H18(l) + 25 O2(g) → 16 CO2(g) + 18 H2O(g)

C8H18(l) + 12 O2(g) → 8 CO2(g) + 9 H2O(g)

2 C8H18(l) + 20 O2(g) → 14 CO2(g) + 16 H2O(g)

C8H18(l) + 25 O2(g) → 16 CO2(g) + 18 H2O(g)

Chemical Composition & Everyday Uses

This quiz tests your knowledge of the chemical compounds commonly found in household products and their everyday uses. Key concepts include the active ingredients in cleaning agents, food preservation, and the roles of various...

Questions: 30 | Attempts: 10 | Last updated: Oct 6, 2026

Sample Question
What is the active chemical compound in bleach that breaks down stains and disinfects?

Sodium lauryl sulfate

Sodium hypochlorite

Sodium bicarbonate

Sodium hydroxide

Subatomic Particles and Atomic Structure

This assessment focuses on subatomic particles and atomic structure. It evaluates understanding of atomic number, mass number, and the role of protons, neutrons, and electrons in determining an atom's identity and properties....

Questions: 30 | Attempts: 14 | Last updated: Oct 6, 2026

Sample Question
What is the atomic number of an atom?

The number of neutrons in the atom

The number of protons in the atom

The sum of protons and neutrons

The number of electrons in the atom

Buffer Solutions and pH Chemistry

This assessment focuses on buffer solutions and their role in maintaining pH levels in biological systems. It evaluates understanding of key concepts such as weak acids, conjugate bases, and the Henderson-Hasselbalch equation....

Questions: 20 | Attempts: 12 | Last updated: Oct 6, 2026

Sample Question
What principle do buffer solutions apply to maintain pH?

Boyle's Law

Le Châtelier's Principle

Avogadro's Law

Hess's Law

Electrochemistry and Its Applications

This quiz assesses your understanding of electrochemistry concepts, including redox reactions, cell potentials, and electrolysis. By answering questions on oxidation, reduction, and standard potentials, you'll reinforce your...

Questions: 15 | Attempts: 14 | Last updated: Oct 4, 2026

Sample Question
In a redox reaction, oxidation is defined as:

Gain of electrons and decrease in oxidation number

Loss of electrons and increase in oxidation number

Gain of protons and decrease in oxidation number

Loss of protons and increase in oxidation number

Stoichiometry: Mass, Moles & Concentration

This assessment focuses on stoichiometry concepts, evaluating your understanding of mass, moles, and concentration. You will solve problems related to moles of compounds, percent yield, mass percent, molarity, and more. This...

Questions: 8 | Attempts: 15 | Last updated: Oct 4, 2026

Sample Question
A sample of calcium carbonate (CaCO₃) has a mass of 50.0 g. How many moles of CaCO₃ are present? (Molar mass of CaCO₃ = 100.09 g/mol)

0.500 mol

0.250 mol

2.00 mol

5.009 mol

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