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The TExES Chemistry 7-12 exam has 100 questions and runs 5 hours.
These 10 free TExES Chemistry 7-12 questions are organized by exam domain, so you can see how each part of the TExES Chemistry 7-12 (240) blueprint is tested. Reveal the answer and explanation under each question.
A school chemistry stockroom stores all reagents in strict alphabetical order on open shelves. Which is the PRIMARY safety concern with this arrangement?
Correct answer: A - Incompatible chemicals may be stored next to one another
During a titration lab, a student splashes a small amount of 6 M hydrochloric acid onto the skin of the forearm. What should the teacher direct the student to do FIRST?
Correct answer: B - Flush the area with running water for at least 15 minutes
Which statement BEST describes the relationship between a scientific theory and a scientific law?
Correct answer: D - A theory explains why something happens; a law describes what happens
How many significant figures are in the measurement 0.004070 kg?
Correct answer: B - Four
A student's five trials for the density of a liquid yield 2.51, 2.49, 2.52, 2.50, and 3.87 g/mL. The student wants to leave the fifth value out of the report. Which action is MOST consistent with scientific ethics?
Correct answer: C - Report all five values and investigate the cause of the fifth
Chlorine occurs naturally as two isotopes: chlorine-35 (mass 34.97 amu, 75.77% abundance) and chlorine-37 (mass 36.97 amu, 24.23% abundance). What is the average atomic mass of chlorine?
Correct answer: A - 35.45 amu
The first four ionization energies of an element, in kJ/mol, are 578, 1,817, 2,745, and 11,577. Based on this pattern, the element MOST likely belongs to which group?
Correct answer: C - Group 13
A sample of gas occupies 2.00 L at 27 °C. If the pressure is held constant, what volume will the gas occupy at 127 °C?
Correct answer: C - 2.67 L
When liquid water is boiled at 100 °C, which of the following is primarily overcome?
Correct answer: D - The hydrogen bonds between water molecules
What is the molecular geometry of a sulfur dioxide (SO₂) molecule?
Correct answer: D - Bent
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