100+ Free UAE TLS Chemistry Test Practice Questions

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Sample UAE TLS Chemistry Test Practice Questions

Try these sample questions to test your UAE TLS Chemistry Test exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1How many protons, neutrons and electrons are present in a neutral atom of the isotope chlorine-37 (atomic number 17)?

A.17 protons, 20 neutrons, 17 electrons

B.17 protons, 17 neutrons, 20 electrons

C.20 protons, 17 neutrons, 20 electrons

D.17 protons, 37 neutrons, 17 electrons

Explanation: The atomic number (17) equals the number of protons, and in a neutral atom the number of electrons equals the number of protons. The mass number 37 minus 17 protons gives 20 neutrons.

2Chlorine has two stable isotopes: chlorine-35 (75.77%) and chlorine-37 (24.23%). Which value is closest to its relative atomic mass?

A.35.0

B.35.5

C.36.0

D.37.0

Explanation: The relative atomic mass is the weighted average: (35 x 0.7577) + (37 x 0.2423) = 26.52 + 8.97 = 35.49, approximately 35.5.

3What is the full ground-state electron configuration of a neutral iron atom (Z = 26)?

A.1s2 2s2 2p6 3s2 3p6 4s2 3d6

B.1s2 2s2 2p6 3s2 3p6 3d8

C.1s2 2s2 2p6 3s2 3p6 4s2 4p6

D.1s2 2s2 2p6 3s2 3p6 4s2 3d4 4p2

Explanation: Iron has 26 electrons. Following the aufbau order, 4s fills before 3d, giving 1s2 2s2 2p6 3s2 3p6 4s2 3d6, which accounts for all 26 electrons.

4Which trend correctly describes atomic radius across Period 3 from sodium to chlorine?

A.Atomic radius increases because the number of energy levels increases

B.Atomic radius decreases because nuclear charge increases while electrons enter the same shell

C.Atomic radius stays constant because the period is unchanged

D.Atomic radius decreases because electrons are removed across the period

Explanation: Across a period the number of protons increases, raising the effective nuclear charge, while added electrons enter the same outer shell. The stronger attraction pulls the outer electrons closer, so atomic radius decreases.

5Which element has the highest first ionization energy?

A.Sodium

B.Magnesium

C.Argon

D.Aluminium

Explanation: Argon is a noble gas with a full, stable electron shell and the highest effective nuclear charge in Period 3, so it requires the most energy to remove an outer electron, giving the highest first ionization energy.

6Why is the first ionization energy of aluminium lower than that of magnesium, against the general across-period trend?

A.Aluminium has fewer protons than magnesium

B.Aluminium's outer electron is in a 3p orbital, which is higher in energy and easier to remove than magnesium's filled 3s

C.Aluminium has a smaller atomic radius than magnesium

D.Magnesium has an incomplete inner shell

Explanation: Magnesium has a stable, filled 3s2 configuration, whereas aluminium's outermost electron occupies a higher-energy 3p orbital that is slightly shielded by the 3s electrons. This 3p electron is removed more easily, so aluminium's first ionization energy is lower.

7Which of the following best describes electronegativity?

A.The energy released when an atom gains an electron

B.The ability of an atom to attract a shared pair of electrons in a covalent bond

C.The energy required to remove the outermost electron

D.The number of electrons an atom can lose

Explanation: Electronegativity is the tendency of an atom to attract a bonding (shared) pair of electrons toward itself within a covalent bond. Fluorine is the most electronegative element on the Pauling scale.

8What type of bonding holds the ions together in solid magnesium oxide (MgO)?

A.Nonpolar covalent bonding

B.Metallic bonding

C.Ionic bonding through electrostatic attraction between Mg2+ and O2- ions

D.Hydrogen bonding

Explanation: Magnesium transfers two electrons to oxygen, forming Mg2+ and O2- ions. The strong electrostatic attraction between these doubly charged ions in a giant lattice gives ionic bonding, explaining MgO's very high melting point.

9According to VSEPR theory, what is the shape and approximate bond angle of a methane (CH4) molecule?

A.Trigonal planar, 120 degrees

B.Tetrahedral, 109.5 degrees

C.Bent, 104.5 degrees

D.Pyramidal, 107 degrees

Explanation: Carbon in methane has four bonding pairs and no lone pairs. These four electron pairs repel equally and arrange themselves to be as far apart as possible, giving a tetrahedral shape with bond angles of 109.5 degrees.

10Why does water (H2O) have a much higher boiling point than hydrogen sulfide (H2S), despite sulfur being below oxygen in the same group?

A.Water molecules form hydrogen bonds, which are stronger than the dipole-dipole forces in H2S

B.Water has a higher molar mass than H2S

C.Water is an ionic compound and H2S is covalent

D.Water molecules are nonpolar and pack more tightly

Explanation: Oxygen is highly electronegative and bonds directly to hydrogen, so water molecules form strong hydrogen bonds. These require significant energy to overcome, raising the boiling point well above that of H2S, which only has weaker dipole-dipole and dispersion forces.

About the UAE TLS Chemistry Test Exam

The UAE Teacher License Subject Test in Chemistry is the subject-specialization examination that chemistry teachers must pass, alongside the separate pedagogy test, to obtain the UAE teaching licence administered by the Ministry of Education's Teacher Licensure System (TLS). It is a computer-based multiple-choice test of chemistry subject-matter knowledge plus chemistry pedagogical content knowledge. Candidates have three attempts, with a 30-day wait between attempts.

Assessment

Computer-based multiple-choice subject-specialization test taken alongside the separate pedagogy test. It assesses chemistry subject-matter knowledge to the level a secondary chemistry teacher must master, plus chemistry pedagogical content knowledge. The exact official question count is not publicly confirmed.

Time Limit

A fixed computer-based session; the exact official duration is not publicly confirmed by the MOE. Confirm the duration in your TLS booking details.

Passing Score

The MOE does not publish a single official pass mark; candidate-reported thresholds around 65-70% are commonly cited but unverified. Rely on the standard shown in your TLS portal.

Exam Fee

Set by the UAE Ministry of Education and paid through the official TLS portal; fees change periodically, so confirm the current amount before booking. (United Arab Emirates Ministry of Education (MOE) - Teacher Licensure System (TLS))

UAE TLS Chemistry Test Exam Content Outline

14%

Atomic Structure and Periodicity

Subatomic particles, isotopes, electron configuration, quantum numbers and periodic trends.

12%

Chemical Bonding and Structure

Ionic, covalent, metallic and dative bonding, VSEPR shapes, polarity and intermolecular forces.

14%

Stoichiometry and the Mole

Mole calculations, balancing equations, limiting reagents, empirical formulae, concentration and yield.

Energetics and Thermochemistry

Enthalpy change, bond enthalpies, Hess's law, formation enthalpies and calorimetry.

Kinetics

Collision theory, activation energy, catalysis and factors affecting reaction rate.

Chemical Equilibrium

Dynamic equilibrium, Le Chatelier's principle, equilibrium constants and the Haber process.

Acids, Bases and Salts

Bronsted-Lowry theory, pH, conjugate pairs, buffers, neutralization, titration and indicators.

Redox and Electrochemistry

Oxidation numbers, reactivity series, galvanic and electrolytic cells and cell potentials.

Organic Chemistry

Functional groups, isomerism, combustion, substitution, polymerization and alcohol oxidation.

States of Matter and Analytical Chemistry

Gas laws, kinetic theory, phase changes, separation techniques, flame tests and ion tests.

11%

Chemistry Teaching and Pedagogy

Student misconceptions, laboratory safety, fair-test practical design and particle-model representations.

How to Pass the UAE TLS Chemistry Test Exam

What You Need to Know

Passing score: The MOE does not publish a single official pass mark; candidate-reported thresholds around 65-70% are commonly cited but unverified. Rely on the standard shown in your TLS portal.
Assessment: Computer-based multiple-choice subject-specialization test taken alongside the separate pedagogy test. It assesses chemistry subject-matter knowledge to the level a secondary chemistry teacher must master, plus chemistry pedagogical content knowledge. The exact official question count is not publicly confirmed.
Time limit: A fixed computer-based session; the exact official duration is not publicly confirmed by the MOE. Confirm the duration in your TLS booking details.
Exam fee: Set by the UAE Ministry of Education and paid through the official TLS portal; fees change periodically, so confirm the current amount before booking.

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

UAE TLS Chemistry Test Study Tips from Top Performers

1Revise the core chemistry strands systematically: stoichiometry and the mole, atomic structure and periodicity, bonding, energetics, kinetics, equilibrium, acids and bases, redox and organic chemistry, since subject-matter mastery dominates this test.

2Do not neglect chemistry pedagogy, because the test includes pedagogical content knowledge such as common student misconceptions, lab safety and fair-test practical design, which are straightforward marks if you prepare for them.

3Practise timed multiple-choice questions and work carefully through calculation questions on moles, concentration, pH and percentage yield, as these are common and easily lost marks under time pressure.

Frequently Asked Questions

What is the UAE TLS chemistry subject test?

It is the chemistry subject-specialization examination within the UAE Ministry of Education's Teacher Licensure System (TLS). Chemistry teachers must pass it together with the separate pedagogy test to earn the UAE teaching licence. It is a computer-based multiple-choice test of chemistry subject knowledge and chemistry pedagogical content knowledge.

How many attempts do I get, and how long must I wait to retake it?

Candidates are allowed three attempts at the test, and must wait 30 days between attempts before retaking it. After exhausting the attempts, a longer waiting period applies. Always confirm the current rules in your MOE TLS account.

What is the passing score and how many questions are there?

The MOE does not publish a single official pass mark or a confirmed public question count for the chemistry subject test. Candidate-reported pass thresholds around 65-70% are commonly cited but unverified. Check your TLS portal for the definitive standard and exam details.

Is the chemistry test purely about chemistry content?

No. It assesses chemistry subject-matter knowledge to the level a secondary chemistry teacher must master, and it also includes chemistry pedagogical content knowledge, such as common student misconceptions, laboratory safety and designing practical investigations.

100+ Free UAE TLS Chemistry Test Practice Questions

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