Question 1

Which of the following statements best explains why sodium (Na) forms a cation (Na+) when it reacts with chlorine (Cl) to form table salt (NaCl)?
Correct answer: Sodium loses an electron to achieve a full outer energy level.

Accepted Answer

Sodium loses an electron to achieve a full outer energy level.

Question 2

A neutral atom of magnesium (Mg) has an atomic number of 12 and an atomic mass of 24. How many neutrons does it have?
Correct answer: 12

Accepted Answer

12

Question 3

Which of the following best describes the difference between a molecule and a compound?
Correct answer: A molecule is a group of atoms held together by covalent bonds, while a compound is a substance formed from two or more different elements.

Accepted Answer

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

Question 4

Which of the following best explains why water (H2O) is considered a polar molecule?
Correct answer: The electrons are shared unequally, resulting in partial charges on the oxygen and hydrogen atoms.

Accepted Answer

The electrons are shared unequally, resulting in partial charges on the oxygen and hydrogen atoms.

Question 5

A solution has a pH of 3. Which of the following statements is true about this solution?
Correct answer: It is acidic and has more H+ ions than OH- ions.

Accepted Answer

It is acidic and has more H+ ions than OH- ions.

Question 6

Which of the following is an example of an isotope?
Correct answer: C-12 and C-14

Accepted Answer

C-12 and C-14

Question 7

If an atom has 17 protons, 18 neutrons, and 17 electrons, what is its atomic mass?
Correct answer: 35

Accepted Answer

35

Question 8

Which property of water allows it to help regulate temperature in living organisms?
Correct answer: Its high specific heat capacity.

Accepted Answer

Its high specific heat capacity.

Question 9

A chemical equation is written as: 2H2 + O2 → 2H2O. What does the coefficient '2' in front of H2O indicate?
Correct answer: Two molecules of water are produced in the reaction.

Accepted Answer

Two molecules of water are produced in the reaction.

Question 10

Which of the following best describes a hydrogen bond?
Correct answer: A weak attraction between a hydrogen atom in one molecule and an electronegative atom in another molecule.

Accepted Answer

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

Question 11

A patient is given a solution with a pH of 9 to neutralize excess stomach acid. What property of this solution makes it effective for this purpose?
Correct answer: It is basic and increases the OH- concentration.

Accepted Answer

It is basic and increases the OH- concentration.

Question 12

Which of the following scenarios best illustrates the concept of adhesion?
Correct answer: Water climbing up a paper towel when it touches a spill.

Accepted Answer

Water climbing up a paper towel when it touches a spill.

Question 13

Which of the following is true about ions?
Correct answer: Anions have gained electrons and are negatively charged.

Accepted Answer

Anions have gained electrons and are negatively charged.

Question 14

A sample of chlorine contains two isotopes: Cl-35 (75%) and Cl-37 (25%). What is the average atomic mass of chlorine?
Correct answer: 35.5

Accepted Answer

35.5

Question 15

Which of the following best explains why NaCl dissolves easily in water?
Correct answer: Water is a versatile solvent due to its polarity, which allows it to surround and separate Na+ and Cl- ions.

Accepted Answer

Water is a versatile solvent due to its polarity, which allows it to surround and separate Na+ and Cl- ions.

Question 16

Which of the following best describes the relationship between atomic number and the identity of an element?
Correct answer: The atomic number is the number of protons, which determines the element.

Accepted Answer

The atomic number is the number of protons, which determines the element.

Question 17

Which of the following is a correct statement about covalent bonds?
Correct answer: Covalent bonds involve the sharing of electrons between atoms.

Accepted Answer

Covalent bonds involve the sharing of electrons between atoms.

Question 18

A neutral atom of sulfur has 16 electrons. How many electrons are in its second energy level?
Correct answer: 8

Accepted Answer

8

Question 19

Which of the following best explains why isotopes of the same element have different atomic masses?
Correct answer: They have different numbers of neutrons.

Accepted Answer

They have different numbers of neutrons.

Question 20

In the chemical equation C6H12O6 + 6O2 → 6CO2 + 6H2O + energy, which of the following is a product?
Correct answer: 6CO2

Accepted Answer

6CO2

Fundamentals of Atoms, Elements, and Chemical Bonds

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