TEAS Science: Chemistry and Physical Science

Question 1

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

Accepted Answer

7

Answer

0

Answer

5

Answer

14

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

A substance that accepts protons (H⁺)

Answer

A substance that accepts electrons

Answer

A substance that donates hydroxide ions (OH⁻)

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

Products must weigh more than reactants

Answer

Reactions always release energy

Answer

Products must be simpler than reactants

Question 4

Which of the following best describes a physical change?

Accepted Answer

Water boiling and turning to steam

Answer

Iron rusting when exposed to oxygen and water

Answer

Wood burning in a fireplace

Answer

Milk souring after being left out

Question 5

What is the atomic number of an element?

Accepted Answer

The number of protons in the nucleus of an atom

Answer

The total number of protons and neutrons in the nucleus

Answer

The number of electrons in the outermost shell

Answer

The average atomic mass of the element

Question 6

Which type of chemical bond involves the sharing of electrons between atoms?

Accepted Answer

Covalent bond

Answer

Ionic bond

Answer

Metallic bond

Answer

Hydrogen bond

Question 7

When a patient receives an IV solution of normal saline (0.9% NaCl), which type of solution is this relative to normal blood plasma?

Accepted Answer

Isotonic solution

Answer

Hypotonic solution

Answer

Hypertonic solution

Answer

Supersaturated solution

Question 8

Which of the following statements about enzymes is TRUE?

Accepted Answer

Enzymes lower the activation energy required for a chemical reaction.

Answer

Enzymes are consumed in the reactions they catalyze.

Answer

Enzymes are denatured and permanently destroyed at 37°C.

Answer

Enzymes can only catalyze reactions in acidic conditions.

Question 9

What is the difference between an element and a compound?

Accepted Answer

An element contains only one type of atom; a compound contains two or more elements chemically bonded together

Answer

An element is a mixture; a compound is a pure substance

Answer

Elements can be separated by physical means; compounds cannot be separated at all

Answer

A compound has fewer atoms than an element

Question 10

Which of the following correctly describes the relationship between the frequency and wavelength of electromagnetic radiation?

Accepted Answer

Frequency and wavelength are inversely proportional; as wavelength increases, frequency decreases

Answer

Frequency and wavelength are directly proportional; as wavelength increases, frequency increases

Answer

Frequency and wavelength are unrelated

Answer

Both frequency and wavelength decrease as energy increases