ATI TEAS Practice Science Test

Correct Answer: B

Rationale: To convert grams to kilograms, we divide by 1000 since there are 1000 grams in a kilogram. Therefore, 1800 grams divided by 1000 equals 1.8 kilograms. Choice B is correct. Choice A is incorrect because 0.18 is the result of dividing by 10, not 1000. Choice C is incorrect as it is 10 times the correct answer. Choice D is incorrect as it is 100 times the correct answer.

Correct Answer: A

Rationale: The correct answer is A: Diffusion. Gas exchange in the respiratory system occurs through diffusion, where oxygen moves from the alveoli in the lungs to the blood and carbon dioxide moves from the blood to the alveoli. This process is driven by a concentration gradient, allowing for the exchange of gases between the air and blood. Exhalation (choice B) is the process of expelling air from the lungs, not the mechanism of gas exchange. Inspiration (choice C) is the process of inhaling air into the lungs, but it is not directly involved in gas exchange. Ventilation (choice D) refers to the movement of air into and out of the lungs and is necessary for gas exchange to occur but is not the actual mechanism of gas exchange itself.

Correct Answer: C

Rationale: Failed to generate a rationale after 5 retries.

Correct Answer: B

Rationale: To convert grams to kilograms, we divide by 1000 since there are 1000 grams in a kilogram. Therefore, 1800 grams divided by 1000 equals 1.8 kilograms. Choice B is correct. Choice A is incorrect because 0.18 is the result of dividing by 10, not 1000. Choice C is incorrect as it is 10 times the correct answer. Choice D is incorrect as it is 100 times the correct answer.

Correct Answer: C

Rationale: To calculate the mass of the atom, we add the number of protons and neutrons since electrons have negligible mass. In this case, 17 protons + 20 neutrons = 37. Therefore, the correct answer is C. Choice A is incorrect because it only considers the number of protons. Choice B is incorrect because it only considers the number of neutrons. Choice D is incorrect because it does not take into account the total number of protons and neutrons in the atom.