ATI TEAS 7
Chemistry
1. What is the term for the process of separating the components of a solution based on their different rates of movement through a medium?
- A. Filtration
- B. Distillation
- C. Chromatography
- D. Precipitation
Correct answer: c
Rationale: Chromatography is a technique used to separate the components of a solution based on their different rates of movement through a medium. The other choices are different separation techniques.
2. What is the process by which a large, unstable nucleus splits into two smaller nuclei, releasing neutrons and energy?
- A. Alpha decay
- B. Beta decay
- C. Gamma decay
- D. Nuclear fission
Correct answer: D
Rationale: Nuclear fission involves splitting a heavy nucleus into smaller fragments, releasing neutrons and energy.
3. Identify the noun in the following sentence: The aroma of freshly baked bread filled the kitchen.
- A. filled
- B. kitchen
- C. aroma
- D. freshly
Correct answer: C
Rationale: Nouns name people, places, things, or ideas. "Aroma" names a specific type of smell.
4. Express 0.75 as a fraction.
- A. 4/5
- B. 3/4
- C. 1/2
- D. 1/4
Correct answer: B
Rationale: Decimals can be represented as fractions where the denominator is a power of 10 (in this case, 10 raised to the power of -1, or 1/10th). So, 0.75 is equivalent to 7/10. We can simplify this fraction by dividing the numerator and denominator by 5, resulting in 3/4.
5. The resolution of an optical instrument, like a microscope, refers to its ability to distinguish between:
- A. Different colors of light
- B. The presence or absence of light
- C. Variations in intensity
- D. Very close, nearly identical objects
Correct answer: D
Rationale: The resolution of an optical instrument, such as a microscope, is its ability to distinguish between very close, nearly identical objects. This means that the instrument can differentiate between two points that are close together and appear almost as one. A higher resolution allows for clearer and sharper images by minimizing the blurring effect that occurs when objects are close together. Options A, B, and C do not directly relate to the concept of resolution in optical instruments. Therefore, option D is the correct answer as it best describes what resolution entails in this context.
6. Which term describes the resistance of a substance to flow?
- A. Density
- B. Viscosity
- C. Conductivity
- D. Malleability
Correct answer: b
Rationale: Viscosity refers to the resistance of a substance to flow. Substances with high viscosity flow slowly, while those with low viscosity flow more easily.
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