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100+ Free TExES Chemistry 240 Practice Questions

Pass your TExES Chemistry 7-12 (240) exam on the first try — instant access, no signup required.

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Which change would generally increase the solubility of most solid solutes in water?

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B
C
D
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2026 Statistics

Key Facts: TExES Chemistry 240 Exam

100

Selected-Response Questions

TExES Chemistry 240 test page

5h / 4h45m

Appointment / Testing Time

TExES Chemistry 240 test page

240

Scaled Passing Score

Texas educator testing program

$116

Current Exam Fee

TExES Chemistry 240 test page

41%

Matter and Energy Domain Weight

TExES Chemistry 240 exam framework

24%

Scientific Inquiry and Processes Weight

TExES Chemistry 240 exam framework

4

Content Domains

TExES Chemistry 240 exam framework

7-12

Certified Grade Span

TExES Chemistry 240 test page

For 2026 planning, the TExES Chemistry 7-12 (240) is a computer-administered exam of 100 selected-response questions with a 5-hour appointment (4 hours 45 minutes of testing), a 240 scaled passing score, and a $116 fee. The framework weights Domain I Scientific Inquiry and Processes at 24%, Domain II Matter and Energy at 41%, Domain III Chemical Reactions at 23%, and Domain IV Science Learning, Instruction, and Assessment at 12%. Because Matter and Energy is by far the largest domain, candidates should prioritize atomic structure, bonding, gas laws, solutions, stoichiometry, and thermochemistry while confirming the current preparation manual before scheduling.

Sample TExES Chemistry 240 Practice Questions

Try these sample questions to test your TExES Chemistry 240 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A student plans to heat a flammable liquid in a chemistry lab. Which piece of equipment should be used as the heat source to follow proper safety practices?
A.An open Bunsen burner flame
B.A hot water bath or hot plate
C.A direct alcohol-lamp flame
D.A propane torch
Explanation: Flammable liquids must never be heated over an open flame because their vapors can ignite. A hot water bath or hot plate provides controlled, flameless heating, greatly reducing fire risk. This is a core laboratory-safety practice on Domain I.
2Which item of personal protective equipment is most essential when a student is pouring a concentrated acid in the laboratory?
A.Latex gloves only
B.Chemical splash goggles
C.A dust mask
D.Closed-toe shoes only
Explanation: Chemical splash goggles protect the eyes, the most vulnerable area, from corrosive acid splashes. Eye protection is required whenever corrosive or hazardous chemicals are handled. While other PPE is useful, splash goggles are the most essential for this task.
3A Safety Data Sheet (SDS) is required to be available for every hazardous chemical in a school lab. Which information does an SDS primarily provide?
A.The retail price of the chemical
B.Hazards, handling, storage, and first-aid measures
C.The chemical's discovery date
D.A list of suppliers in the region
Explanation: A Safety Data Sheet provides standardized information on a chemical's hazards, safe handling and storage, exposure controls, and first-aid and spill-response measures. Teachers must know how to locate and interpret SDS information to manage lab safety.
4In the event of a small acid spill on a lab bench, which substance is most appropriate to neutralize the acid before cleanup?
A.Concentrated hydrochloric acid
B.Sodium bicarbonate
C.Pure water poured rapidly
D.Ammonium nitrate
Explanation: Sodium bicarbonate (baking soda) is a mild base that safely neutralizes acid spills, converting the acid into less hazardous salt, water, and carbon dioxide. Commercial acid spill kits commonly contain bicarbonate-based neutralizers.
5A teacher wants students to design a controlled experiment testing how temperature affects reaction rate. Which variable should be the independent variable?
A.The reaction rate measured
B.The temperature of the reactants
C.The volume of the container
D.The type of catalyst used
Explanation: The independent variable is the one the experimenter deliberately changes. Since the investigation tests how temperature affects rate, temperature is the independent variable, and reaction rate is the dependent variable that is measured in response.
6Which statement best describes a scientific theory in chemistry?
A.A guess that has not been tested
B.A well-substantiated explanation supported by extensive evidence
C.A mathematical statement that is always true
D.A temporary idea discarded once proven
Explanation: In science, a theory is a well-substantiated, comprehensive explanation of a natural phenomenon that is supported by a large body of evidence and repeated testing. It is not a mere guess and represents some of the most reliable knowledge in science.
7A measurement of 0.004520 grams is recorded. How many significant figures does this value contain?
A.Three
B.Four
C.Five
D.Six
Explanation: Leading zeros are never significant, so the zeros before the 4 do not count. The digits 4, 5, 2, and the trailing 0 are all significant, giving four significant figures. Trailing zeros after a decimal point are significant.
8Which SI base unit is used to express the amount of a substance in chemistry?
A.Gram
B.Mole
C.Liter
D.Kelvin
Explanation: The mole is the SI base unit for amount of substance, representing 6.022 x 10^23 particles (Avogadro's number). It links the number of particles to measurable masses in chemical calculations.
9A student converts 250 milliliters to liters. What is the correct value?
A.0.025 L
B.0.25 L
C.2.5 L
D.25 L
Explanation: There are 1000 milliliters in one liter, so dividing 250 mL by 1000 gives 0.25 L. Dimensional analysis using the conversion factor 1 L per 1000 mL produces the same result.
10Which historical model of the atom first proposed that electrons travel in fixed, quantized energy levels around the nucleus?
A.Dalton's solid sphere model
B.Thomson's plum pudding model
C.Bohr's planetary model
D.Rutherford's nuclear model
Explanation: Niels Bohr proposed that electrons occupy fixed, quantized orbits or energy levels around the nucleus, emitting or absorbing energy only when they jump between levels. This model explained the discrete line spectrum of hydrogen.

About the TExES Chemistry 240 Exam

TExES Chemistry 7-12 (240) is the Texas content exam required to teach chemistry in grades 7-12. The official framework organizes the 100 selected-response questions into four domains: Scientific Inquiry and Processes, Matter and Energy, Chemical Reactions, and Science Learning, Instruction, and Assessment. The exam emphasizes deep chemistry content knowledge alongside research-based science teaching.

Questions

100 scored questions

Time Limit

5h appointment (4h 45m testing)

Passing Score

240 (scaled)

Exam Fee

$116 (Texas Educator Certification Examination Program / Pearson)

TExES Chemistry 240 Exam Content Outline

24%

Scientific Inquiry and Processes

Laboratory safety and management, the nature of science and scientific inquiry, mathematics and unifying concepts, and the history and societal impact of science.

41%

Matter and Energy

Characteristics and structure of matter, atomic structure, gas behavior, ionic and covalent bonding, chemical notation, solutions and their properties, and energy transformations.

23%

Chemical Reactions

Chemical kinetics and equilibrium, acids and bases, oxidation-reduction reactions, and nuclear reactions.

12%

Science Learning, Instruction, and Assessment

Research-based science instruction, how students learn chemistry, and monitoring and assessing science learning.

How to Pass the TExES Chemistry 240 Exam

What You Need to Know

  • Passing score: 240 (scaled)
  • Exam length: 100 questions
  • Time limit: 5h appointment (4h 45m testing)
  • Exam fee: $116

Keys to Passing

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

TExES Chemistry 240 Study Tips from Top Performers

1Spend the most time on Domain II Matter and Energy since it is 41% of the exam, covering atomic structure, bonding, gas laws, solutions, and thermochemistry
2Practice stoichiometry, molarity, percent yield, and gas-law calculations until they are fast and automatic
3Memorize core lab-safety rules: PPE, SDS use, flammable-liquid heating, spill neutralization, and proper chemical waste disposal
4Connect periodic trends (atomic radius, ionization energy, electronegativity) to bonding and reactivity rather than memorizing them in isolation
5For Domain IV, choose inquiry-based, constructivist, and data-driven instruction options that address student misconceptions and use formative assessment
6Use the official TExES Chemistry 7-12 (240) preparation manual and confirm the current framework before scheduling your test

Frequently Asked Questions

How many questions are on the TExES Chemistry 7-12 (240) exam?

The official test page lists 100 selected-response questions. The appointment is 5 hours, which includes 4 hours 45 minutes of actual testing time after the tutorial and compliance agreement.

What passing score do I need for the TExES Chemistry 240?

The passing standard is a scaled score of 240. TExES scaled scores run from 100 to 300, so aim for consistent performance across all four domains rather than targeting a guessed raw-score cutoff.

How much does the TExES Chemistry 7-12 (240) exam cost?

The current computer-administered testing fee is $116. Always confirm the fee during registration because Texas educator test fees can change.

Which domain is weighted most heavily on the TExES Chemistry 240?

Domain II Matter and Energy is the largest at 41%. Domain I Scientific Inquiry and Processes is 24%, Domain III Chemical Reactions is 23%, and Domain IV Science Learning, Instruction, and Assessment is 12%.

What topics does the TExES Chemistry 240 cover?

It covers laboratory safety and inquiry, atomic structure and the periodic table, ionic and covalent bonding, gas laws, solutions, stoichiometry, thermochemistry, kinetics and equilibrium, acids and bases, redox and nuclear chemistry, plus science teaching and assessment.

How should I study for the TExES Chemistry 240 efficiently?

Prioritize Domain II Matter and Energy because it is 41% of the exam, then practice chemical reactions and inquiry. Use the official preparation manual, work timed practice questions, and review lab safety and science-teaching pedagogy.