ATI TEAS 7
Chemistry
1. Which of the following is a strong base commonly used in cleaning products?
- A. Sodium hydroxide (NaOH)
- B. Ammonium hydroxide (NHâ‚„OH)
- C. Calcium hydroxide (Ca(OH)â‚‚)
- D. Potassium hydroxide (KOH)
Correct answer: A
Rationale: Sodium hydroxide is a strong base commonly used in cleaning products. The other choices are also bases but are not as strong as sodium hydroxide.
2. What is the acceleration of an object moving at a constant speed of 20 m/s if it comes to a complete stop within 5 seconds?
- A. 0 m/s² (no acceleration)
- B. 4 m/s²
- C. -4 m/s²
- D. Information insufficient
Correct answer: C
Rationale: The acceleration can be calculated using the formula: acceleration = (final velocity - initial velocity) / time. In this case, the final velocity is 0 m/s (as the object comes to a complete stop), the initial velocity is 20 m/s, and the time taken is 5 seconds. Plugging these values into the formula, we get acceleration = (0 m/s - 20 m/s) / 5 s = -20 m/s / 5 s = -4 m/s². Therefore, the acceleration is -4 m/s².
3. Which of the following represents a form of potential energy?
- A. A moving car
- B. A spinning top
- C. A raised hammer
- D. A rolling ball
Correct answer: c
Rationale: A raised hammer possesses potential energy due to its elevated position relative to the ground.
4. Which type of energy is associated with the random motion of particles in a substance?
- A. Potential energy
- B. Mechanical energy
- C. Thermal energy
- D. Chemical energy
Correct answer: c
Rationale: Thermal energy is related to the random motion of particles in a substance and is associated with temperature.
5. What is the main function of the large intestine?
- A. Break down food
- B. Absorb water
- C. Secrete digestive enzymes
- D. Store waste
Correct answer: B
Rationale: The correct answer is B: "Absorb water." The main function of the large intestine is to absorb water and electrolytes from the undigested food material that passes through it. This helps in the formation of solid waste or feces, which is then stored in the rectum until it is eliminated from the body. Breaking down food primarily occurs in the small intestine, while the large intestine focuses on reabsorbing water to prevent dehydration. Secreting digestive enzymes is mainly done by the pancreas and liver, not the large intestine.
6. Why are noble gas elements generally unreactive?
- A. They are too large and cannot form bonds easily.
- B. They lack valence electrons in their outermost shell.
- C. They have strong bonds within their own molecules.
- D. They have already achieved stable electron configurations.
Correct answer: D
Rationale: They have already achieved stable electron configurations. With completely filled outermost shells, noble gas elements have no need to gain or lose electrons, minimizing their tendency to participate in chemical reactions.
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