Question 1

Which of the following statements best explains why sodium (Na) readily forms an ionic bond with chlorine (Cl) to create table salt (NaCl)?

Accepted Answer

Sodium loses an electron to achieve a stable electron configuration, while chlorine gains an electron to fill its outer shell, resulting in oppositely charged ions that attract each other.

Question 2

A neutral atom of magnesium (atomic number 12, atomic mass 24) has how many neutrons?

Accepted Answer

12

Question 3

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom in one molecule and an electronegative atom in another molecule.

Question 4

Which property of water is most directly responsible for its ability to dissolve many substances, making it a 'universal solvent'?

Accepted Answer

Its polarity, which allows it to surround and separate ions and polar molecules.

Question 5

A solution has a pH of 3. Which of the following statements is true about this solution?

Accepted Answer

It is acidic and has a higher concentration of H+ ions than a solution with pH 7.

Question 6

Which of the following best distinguishes an isotope from a standard atom of the same element?

Accepted Answer

Isotopes have a different number of neutrons.

Question 7

Which of the following electron configurations represents a stable atom?

Accepted Answer

First shell: 2 electrons; Second shell: 8 electrons

Question 8

A patient is given a radioactive isotope of iodine (I-131) to diagnose thyroid function. Which property of isotopes makes this possible?

Accepted Answer

Isotopes have the same number of protons but a different number of neutrons, allowing some to be radioactive.

Question 9

Which of the following best describes the difference between a molecule and a compound?

Accepted Answer

A molecule is a group of atoms held together by covalent bonds, while a compound is a substance formed when two or more different elements bond together.

Question 10

Given the chemical equation: 2H2 + O2 → 2H2O, how many total hydrogen atoms are present among the reactants?

Accepted Answer

4

Question 11

A neutral atom of sulfur has an atomic number of 16 and an atomic mass of 32. If it gains two electrons, what is its resulting charge and number of neutrons?

Accepted Answer

Charge: -2; Neutrons: 16

Question 12

Which of the following best explains why water has a high specific heat compared to many other substances?

Accepted Answer

Hydrogen bonds between water molecules require more energy to break, so water can absorb more heat before its temperature rises.

Question 13

Which of the following is an example of a polar covalent bond?

Accepted Answer

The bond between hydrogen and oxygen in H2O

Question 14

If a solution contains more OH- ions than H+ ions, which of the following is true?

Accepted Answer

The solution is basic and has a pH greater than 7.

Question 15

Which of the following best describes the role of coefficients in a chemical equation?

Accepted Answer

They indicate the number of molecules or formula units involved in the reaction.

Question 16

A student dissolves 10 grams of NaCl in 100 mL of water. In this solution, which is the solute and which is the solvent?

Accepted Answer

NaCl is the solute; water is the solvent.

Question 17

Which of the following best explains why noble gases (like neon and argon) are chemically unreactive?

Accepted Answer

Their outermost energy levels are full, making them stable and unlikely to form bonds.

Question 18

Which of the following is true about the atomic number of an element?

Accepted Answer

It is equal to the number of protons in the atom.

Question 19

Which of the following scenarios best illustrates the concept of adhesion?

Accepted Answer

Water droplets sticking to the inside of a glass window.

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