Which of the following properties of water explains its solvent abilities for certain substances?

A. Polarity of water molecules

B. High specific heat

C. High surface tension

D. Kinetic energy of liquid water molecules

Answer Explanation:

Water is a versatile solvent because it can dissolve many different kinds of substances. The reason for this is the polarity of water molecules, which means that they have a slight positive charge on one end and a slight negative charge on the other. This allows water molecules to attract and surround ions or polar molecules of other substances, forming hydration shells that separate them from each other.

Therefore, the Correct Answer is A.

Q #1: To separate genomic DNA fragments by size, which of these laboratory methods is most useful?

A. Filtration

B. Spectrophotometry

C. Titration

D. Electrophoresis

Answer Explanation

One of the most common techniques for separating DNA fragments by size is electrophoresis. Electrophoresis is a process that uses an electric field to move charged molecules through a porous gel matrix. The gel acts as a sieve, allowing smaller molecules to move faster and farther than larger ones. By applying a dye to the DNA samples and loading them into wells at one end of the gel, the DNA fragments can be visualized as bands after electrophoresis. The distance of each band from the well indicates the size of the corresponding DNA fragment.
Q #2: Lithium has an atomic number of 3 and a mass number of 7. Which of the following is the number of protons in a lithium atom?

A. 12

B. 3

C. 4

D. 7

Answer Explanation

The number of protons in an atom is equal to its atomic number. In this case, lithium has an atomic number of 3, so it contains 3 protons.

The other choices (A, C, and D) do not represent the correct number of protons for a lithium atom.
Q #3: #OF FILTERS MASS (g) TERMINAL VELOCITY (m/s) 1 1.01 1.74 2 1.99 2.48 3 3.02 3.04 4 4.0 3.50 5 5.01 3.80 A group of students perform an experiment to test terminal velocity, which is the greatest speed obtained by a falling object. The students dropped different numbers of coffee filters and measured the resulting terminal velocity. Which of the following conclusions is supported by the data in the following data table?

A. Terminal velocity is when the force of gravity is equal to air resistance.

B. Heavier objects take more time to reach terminal velocity.

C. The greater the number of filters, the smaller the terminal velocity

D. Heavier objects fall faster than lighter objects.

Answer Explanation

Terminal velocity is the maximum speed achieved by an object freely falling through a gas or liquid. At terminal velocity, the forces acting on the object are balanced so it is no longer accelerating. Terminal velocity is achieved when the force of gravity is equal to air resistance. From the data table you provided, we can see that as the mass of the coffee filters increases, so does the terminal velocity. This means that heavier objects fall faster than lighter objects. Therefore, conclusion D is supported by the data in the table.

Free Access on TEAS 7 Exams and Study Notes

Access to all TEAS 7 Exams
Performance Tracking and Analysis
Well Documented and Explained Questions and Answers
2000+ Questions and Correct Answers: Answers Well Explained
Libary of Detailed StudyNotes
Topical Questions and Answers on Examinable topics

Join Now

Which of the following properties of water explains its solvent abilities for certain substances?

More Questions on TEAS 7 Science

Q #1: To separate genomic DNA fragments by size, which of these laboratory methods is most useful?

Answer Explanation

Q #2: Lithium has an atomic number of 3 and a mass number of 7. Which of the following is the number of protons in a lithium atom?

Answer Explanation

Answer Explanation

Free Access on TEAS 7 Exams and Study Notes

TEAS 7 Exams (Q&A)

TEAS 7 Study Notes

TEAS 7 Topical Tests

TEAS 7 Study Guides

Quick Links

Refer a Friend