Question 1

Which of the following best describes the primary difference between an ionic bond and a covalent bond?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electrons between atoms.

Question 2

An atom has 11 protons and 12 neutrons. What is its atomic number and mass number?

Accepted Answer

Atomic number: 11, Mass number: 23

Question 3

Why do noble gases (Group 18) rarely form chemical bonds with other elements?

Accepted Answer

They have a full valence shell, making them chemically stable and unreactive.

Question 4

Balance the following chemical equation: $$H_2$$ + $$O_2$$ \rightarrow H_2O$$

Accepted Answer

$$2H_2 + O_2$ \rightarrow 2H_2O$$

Question 5

A student tests a mystery liquid and the pH strip turns bright red, indicating a pH of 2. What does this tell you about the substance?

Accepted Answer

It is a strong acid.

Question 6

Which of the following best explains why sodium (Na) and chlorine (Cl) form an ionic bond in table salt ($$NaCl$$)?

Accepted Answer

Sodium donates an electron to chlorine, resulting in oppositely charged ions that attract each other.

Question 7

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 8

A patient is given a solution with a pH of 8. Which of the following best describes this solution?

Accepted Answer

It is a weak base.

Question 9

Which of the following best describes the octet rule as it applies to chemical bonding?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve a full set of eight valence electrons.

Question 10

Which of the following is the correct electron configuration for a neutral sodium atom ($$Na$$), atomic number 11?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^1$$

Question 11

A chemical reaction produces water from hydrogen and oxygen gases. If you start with 4 moles of $$H_2$$ and 2 moles of $$O_2$$, how many moles of $$H_2O$$ can be produced according to the balanced equation $$2H_2 + O_2$ \rightarrow 2H_2O$$?

Accepted Answer

4 moles

Question 12

Which of the following best explains why hydrochloric acid ($$HCl) is $$considered a strong acid?

Accepted Answer

It completely dissociates into $$H^+$$ and $$Cl^-$$ ions in water.

Question 13

Which of the following is a correct statement about the mass number of an atom?

Accepted Answer

The mass number is the sum of the number of protons and neutrons in the nucleus.

Question 14

A solution has a pH of 7. Which of the following best describes this solution?

Accepted Answer

It is neutral.

Question 15

Which of the following best describes what happens to the electrons in a covalent bond?

Accepted Answer

Electrons are shared between two atoms.

Question 16

A sample of an unknown gas does not react with any other element and has a full outer shell of electrons. To which group does this element most likely belong?

Accepted Answer

Group 18 (noble gases)

Question 17

Which of the following is the correct balanced equation for the reaction of hydrogen and oxygen to form water?

Accepted Answer

$$2H_2 + O_2$ \rightarrow 2H_2O$$

Question 18

Which of the following best describes the behavior of electrons in an ionic bond between magnesium ($$Mg) $$and chlorine ($$Cl$$)?

Accepted Answer

Magnesium donates two electrons to two chlorine atoms, forming $$Mg^{2+}$$ and two $$Cl^-$$ ions.

Question 19

A solution is tested and found to have a pH of 13. Which of the following best describes this solution?

Accepted Answer

It is a strong base.

Atomic Structure & Bonding Study Guide for GOB Chemistry

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