Question 1

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, typically between a metal and a non-metal, while covalent bonds involve the sharing of electron pairs between two non-metals.

Question 2

A substance has a pH of 2. Which statement is most accurate about its properties?

Accepted Answer

It is a strong acid and will turn litmus paper red.

Question 3

What is the atomic number and mass number of an atom with 11 protons and 12 neutrons?

Accepted Answer

Atomic number: 11, Mass number: 23

Question 4

Why are noble gases generally unreactive?

Accepted Answer

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

Question 5

Which equation correctly represents the balanced formation of water according to the Law of Conservation of Mass?

Accepted Answer

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

Question 6

Which of the following is most likely to form an ionic bond?

Accepted Answer

Sodium and Chlorine

Question 7

If a chemical reaction produces a solution with a pH of 9, what can be inferred about the solution?

Accepted Answer

It is basic and will turn litmus paper blue.

Question 8

Which of the following statements about the Law of Conservation of Mass is correct?

Accepted Answer

The total number of atoms on the reactant side must equal the total number of atoms on the product side.

Question 9

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electron pairs between two non-metals.

Question 10

A student mixes hydrochloric acid (HCl) with water and measures the pH as 1. What color would you expect the pH indicator to show?

Accepted Answer

Red

Question 11

Which of the following is a real-world example of an ionic compound?

Accepted Answer

Table salt ($$NaCl)$$

Question 12

If an atom has 11 protons, 12 neutrons, and 11 electrons, what is its charge?

Accepted Answer

It is neutral.

Question 13

Which of the following substances is most likely to have a pH of 7?

Accepted Answer

Pure water

Question 14

A chemical equation is unbalanced as follows: $$C_2H_6 + O_2$ \rightarrow CO_2$ + H_2O. $$Which coefficient for $$O_2$$ will balance the equation?

Accepted Answer

3.5

Question 15

Which of the following is NOT a property of noble gases?

Accepted Answer

They are chemically reactive.

Question 16

Which of the following best explains why sodium forms an ionic bond with chlorine?

Accepted Answer

Sodium donates an electron to chlorine, resulting in a positive sodium ion and a negative chloride ion.

Question 17

Which of the following would most likely result in a covalent bond?

Accepted Answer

A reaction between hydrogen and oxygen

Question 18

A solution turns universal indicator purple. What is the most likely pH range?

Accepted Answer

12–14

Question 19

Which of the following is a multi-step process required to balance the equation $$Fe + O_2$ \rightarrow Fe_2O_3$$?

Accepted Answer

Add coefficients of 4 to $$Fe$$ and 3 to $$O_2 to $$get $$4Fe + 3O_2 \rightarrow 2Fe_2O_3.$$

Question 20

Which of the following statements about acids and bases is correct?

Accepted Answer

Acids have a pH less than 7, while bases have a pH greater than 7.

Atomic Structure, Bonding, and Chemical Properties: Study Notes

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