ATI TEAS 7 Science - Nurselytic

Correct Answer: A

Rationale: In the scientific method, scientists often create models during the hypothesis stage. Creating models at this stage helps visualize or simulate ideas before proceeding to experimentation and data analysis. Models are valuable tools that allow scientists to conceptualize and test their ideas before conducting experiments to gather data and draw conclusions.
Therefore, the correct answer is A.
Choice B, data analysis, occurs after experiments have been conducted and data has been collected, making it an incorrect choice.
Choice C, experimentation, involves conducting tests and observations based on the hypothesis, but the creation of models typically happens before this stage.
Choice D, conclusion, is the final step where scientists interpret the results and draw implications, making it an inappropriate step for creating a model.

Correct Answer: C

Rationale: Vitamin K is essential for blood clotting as it plays a crucial role in the synthesis of clotting factors in the liver. Deficiency in vitamin K can result in impaired blood clotting and excessive bleeding. Vitamin K is necessary for the activation of proteins that are involved in the blood clotting process, making it a vital nutrient for maintaining proper hemostasis. Vitamin A (
Choice
A) is important for vision and immune function, Vitamin C (
Choice
B) is crucial for collagen synthesis and antioxidant protection, and Vitamin D (
Choice
D) is essential for calcium absorption and bone health. However, when it comes to blood clotting specifically, Vitamin K is the key vitamin involved.

Correct Answer: B

Rationale: A balanced chemical equation must have the same number of atoms of each element on both sides of the equation. In option B, 2H2 + O2 → 2H2O, the equation is balanced as there are 2 hydrogen atoms and 2 oxygen atoms on both the reactant and product sides after balancing, satisfying the law of conservation of mass. Option A is unbalanced as there are 2 oxygen atoms on the reactant side but only 1 oxygen atom on the product side. Option C is unbalanced with 3 hydrogen atoms on the reactant side and 2 hydrogen atoms on the product side. Option D is unbalanced with 1 oxygen atom on the reactant side and 2 oxygen atoms on the product side.

Correct Answer: B

Rationale: The correct answer is B: '
To clot blood.' Platelets play a crucial role in the clotting process, forming a plug at the site of blood vessel injury to prevent excessive bleeding. While red blood cells carry oxygen, white blood cells fight infection, and nutrients are transported by plasma, platelets are specifically responsible for blood clotting.
Choice A is incorrect because red blood cells are responsible for carrying oxygen.
Choice C is incorrect because white blood cells are primarily involved in fighting infection.
Choice D is incorrect as the transport of nutrients is mainly carried out by plasma, not platelets.

Correct Answer: C

Rationale: Molarity is a measure of the concentration of a solute in a solution. It is defined as the number of moles of solute per liter of solution. Molarity is not a measure of the volume of the solvent (choice
A), the amount of solute (choice
B), or the temperature of the solution (choice
D).
Therefore, the correct answer is the concentration of solute (choice
C) as molarity specifically quantifies the solute concentration in a solution.