TEAS Science: Chemistry and Physical Science

Question 1

What is the pH of a neutral solution at 25°C?

Accepted Answer

7

Answer

A neutral solution has a pH of 7, where the concentration of hydrogen ions (H⁺) equals the concentration of hydroxide ions (OH⁻).

Question 2

Which of the following best describes an acid according to the Brønsted-Lowry definition?

Accepted Answer

A substance that donates protons (H⁺)

Answer

In the Brønsted-Lowry theory, an acid is a proton (H⁺) donor — it releases H⁺ ions in solution.

Question 3

In a chemical equation, what does the law of conservation of mass require?

Accepted Answer

The number of atoms of each element must be equal on both sides of the equation

Answer

The law of conservation of mass states that matter cannot be created or destroyed — the total mass and number of atoms of each element must be the same on both sides of a chemical equation.

Question 4

Which of the following best describes a physical change?

Accepted Answer

Water boiling and turning to steam

Answer

Water boiling is a physical change — the chemical composition (H₂O) does not change, only the physical state (liquid to gas).

Question 5

What is the atomic number of an element?

Accepted Answer

The number of protons in the nucleus of an atom

Answer

The atomic number (Z) is the number of protons in the nucleus, which uniquely identifies the element and determines its position on the periodic table.

TEAS Practice Test

TEAS Practice Test

TEAS Science: Chemistry and Physical Science