ATI TEAS 7
Chemistry
1. Which of the following substances is an example of an acidic gas?
- A. Nitrogen (Nâ‚‚)
- B. Carbon dioxide (COâ‚‚)
- C. Sulfur dioxide (SOâ‚‚)
- D. Oxygen (Oâ‚‚)
Correct answer: C
Rationale: Sulfur dioxide is an acidic gas. The other choices are either neutral or basic gases.
2. Which property of a wave represents the distance between two successive identical points on a wave?
- A. Wavelength
- B. Amplitude
- C. Frequency
- D. Period
Correct answer: a
Rationale: Wavelength is the distance between two identical points (like crests or troughs) on a wave.
3. Describe the ethical considerations surrounding the potential use of CRISPR-Cas9 technology in humans.
- A. Concerns about unintended consequences on the genome and potential off-target effects.
- B. Debates on modifying the human germline and potential eugenic implications.
- C. Accessibility and affordability of the technology, ensuring equitable access to benefits.
- D. Risks associated with CRISPR-Cas9 editing germline cells and potential long-term impacts.
Correct answer: B
Rationale: CRISPR-Cas9's ability to precisely edit germline cells raises ethical dilemmas about modifying the human gene pool. This includes concerns about eugenics, unintended consequences, and the long-term impact on future generations.
4. Balance the following redox reaction in acidic solution: I⻠(aq) + Cr₂O₇²⻠(aq) -> I₂ (aq) + Cr³⺠(aq). Identify the oxidizing agent and reducing agent.
- A. I⻠is oxidized, Cr₂O₇²⻠is reduced
- B. I⻠is reduced, Cr₂O₇²⻠is oxidized.
- C. Both I⻠and Cr₂O₇²⻠are oxidized.
- D. Both I⻠and Cr₂O₇²⻠are reduced.
Correct answer: A
Rationale: . I⻠loses an electron (oxidation), Cr₂O₇²⻠gains electrons (reduction).
5. In the reaction 2H2 + O2 → 2H2O, how many moles of oxygen are required to react completely with 4 moles of hydrogen?
- A. 1
- B. 2
- C. 3
- D. 4
Correct answer: 2
Rationale: The balanced equation indicates a 1:1 ratio between H2 and O2, so 4 moles of H2 require 4 moles of O2, and 2 moles of H2 require 2 moles of O2.
6. A medication order is written as 3/4 of a tablet. If each tablet is 500mg, what is the equivalent dosage in milligrams?
- A. 375mg
- B. 425mg
- C. 450mg
- D. 475mg
Correct answer: A
Rationale: Multiply the tablet strength (500mg) by the fractional dose (3/4) to get 375 milligrams.
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