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Nursing Elites

ATI TEAS 7

Chemistry

1. Identify the spectator ions in the reaction: 2KCl + Pb(NO3)2 → 2KNO3 + PbCl2.

Correct answer: B

Rationale: Rationale: - In the reaction, potassium ions (K+) and chloride ions (Cl-) are present on both sides of the equation. They are not involved in the formation of the products and remain unchanged. - Lead ions (Pb2+) and nitrate ions (NO3-) are involved in the formation of the products potassium nitrate (KNO3) and lead(II) chloride (PbCl2). - Therefore, the spectator ions in this reaction are K+ and Cl-.

2. What is a mutation?

Correct answer: A

Rationale: Rationale: A mutation is defined as a change in the DNA sequence. Mutations can occur due to various factors such as errors during DNA replication, exposure to mutagens (e.g., chemicals, radiation), or spontaneous changes. These changes can result in alterations to the genetic information carried by an organism, which can have different effects ranging from harmless variations to causing genetic disorders or diseases. Mutations are a fundamental aspect of genetic diversity and evolution. Options B, C, and D do not accurately describe what a mutation is.

3. What is the main verb tense in the following sentence? "She had already left before I arrived."

Correct answer: D

Rationale: The verb "had left" is in the past perfect tense, indicating an action completed before another past action ("arrived").

4. What happens to the force of gravity between two objects when the distance between them is doubled?

Correct answer: d

Rationale: According to the inverse square law of gravity, the force of gravity decreases by a factor of 4 when the distance between two objects is doubled.

5. Bile, a yellowish-green fluid, is stored in the gallbladder and released into the small intestine during digestion. What is the primary function of bile in digestion?

Correct answer: C

Rationale: The primary function of bile in digestion is to emulsify fats. Bile contains bile salts that help break down large fat globules into smaller droplets, which increases the surface area for enzymes to work on and aids in the absorption of fats in the small intestine. This process is essential for the digestion and absorption of dietary fats. Bile does not directly break down carbohydrates or proteins, and it is not involved in neutralizing stomach acid, making option C the correct answer.

6. What is the law that states energy can neither be created nor destroyed?

Correct answer: B

Rationale: Law of Conservation of Energy. This law applies to both chemical and physical processes, including chemical reactions.

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