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 a metal to a non-metal, while covalent bonds involve the sharing of electrons between two non-metals.

Question 2

A student is given a sample of table salt (NaCl) and water (H$$_2O). $$Which type of bond is present in each compound?

Accepted Answer

NaCl has ionic bonds; H$$_2O $$has covalent bonds.

Question 3

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

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 energetically stable.

Question 5

Which of the following chemical equations is correctly balanced according to the Law of Conservation of Mass?

Accepted Answer

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

Question 6

A solution has a pH of 2. Which statement best describes this solution?

Accepted Answer

It is a strong acid.

Question 7

Which of the following substances would most likely have a pH of 13?

Accepted Answer

Household bleach

Question 8

If a chemical reaction starts with 4 hydrogen atoms and 2 oxygen atoms, how many of each atom must be present in the products to satisfy the Law of Conservation of Mass?

Accepted Answer

4 hydrogen atoms and 2 oxygen atoms

Question 9

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

Accepted Answer

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

Question 10

A student mixes a solution and observes that the pH is 7. What does this indicate about the solution?

Accepted Answer

The solution is neutral.

Question 11

Which of the following is a correct statement about the pH scale?

Accepted Answer

A pH of 7 is neutral.

Question 12

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

Accepted Answer

Electrons are shared between two atoms.

Question 13

A chemist needs to balance the following equation: $$H_2$$ + $$O_2$$ \rightarrow H_2O$$. What coefficients should be placed in front of each compound to balance the equation?

Accepted Answer

2, 1, 2

Question 14

Which of the following is a property of noble gases that makes them unique among elements?

Accepted Answer

They have a full outer electron shell.

Question 15

A solution turns universal indicator paper blue. What can you infer about its pH and chemical nature?

Accepted Answer

It has a high pH and is basic.

Question 16

Which of the following best describes the Law of Conservation of Mass as it applies to chemical reactions?

Accepted Answer

The number of atoms of each element is the same before and after the reaction.

Question 17

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

Accepted Answer

Water (H$$_2O)$$

Question 18

A patient is given a solution with a pH of 4 to drink. Which of the following best describes the solution?

Accepted Answer

It is a weak acid.

Question 19

Which of the following statements about sodium (Na) is correct based on its atomic structure?

Accepted Answer

Sodium has 11 protons and 12 neutrons.

Question 20

Which of the following best explains why water (H$$_2O) is a $$covalent compound?

Accepted Answer

It is formed from two non-metals sharing electrons.

Atomic Structure, Bonding, and Chemical Properties: General Chemistry Study Notes

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