ati teas 7 science

Correct Answer: A

Rationale: The correct answer is A: Covalent bond. In a covalent bond, atoms share electrons to achieve a stable electron configuration. This sharing allows both atoms to fill their outer electron shells and form a strong bond. Ionic bonds (choice B) involve the transfer of electrons, not sharing. Metallic bonds (choice C) occur in metals where electrons are delocalized. Hydrogen bonds (choice D) are weak electrostatic attractions between hydrogen and electronegative atoms, not a result of electron sharing. Thus, the correct answer is A because it accurately describes the sharing of electrons between elements to form a covalent bond.

Correct Answer: B

Rationale: The correct answer is B. A decomposition reaction involves a single compound breaking down into two or more simpler substances. In choice B, CaCO3 decomposes into CaO and CO2. This reaction follows the general form AB → A + B, making it a clear example of a decomposition reaction. Choices A, C, and D involve synthesis or combination reactions, where simpler substances combine to form a more complex compound, making them incorrect for this question.

Correct Answer: C

Rationale: The correct answer is C: Nasal passages. Nasal passages contain mucous membranes that produce mucus to humidify and warm inhaled air. The mucus traps particles and adds moisture to the air, making it easier for the lungs to absorb oxygen. The trachea (A) is a passageway for air but does not actively humidify or warm it. The larynx (B) is responsible for sound production and protecting the airway, not for conditioning air. The bronchi (D) are branching airways that lead from the trachea to the lungs, but they do not play a direct role in humidifying or warming inhaled air.

Correct Answer: C

Rationale: The correct answer is C: Nucleus. The nucleus is responsible for controlling the activities of the cell because it houses the cell's DNA, which contains instructions for cellular functions. It regulates gene expression and controls the production of proteins. The Golgi apparatus (choice A) is involved in processing and packaging proteins. Mitochondria (choice B) are responsible for energy production. Ribosomes (choice D) are responsible for protein synthesis. However, the nucleus is the main organelle that directly regulates and controls the activities of the cell.

Correct Answer: C

Rationale: Failed to generate a rationale after 5 retries.