Question 1

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

Accepted Answer

In an ionic bond, electrons are transferred from one atom to another; in a covalent bond, electrons are shared between atoms.

Question 2

An atom of sodium 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 elements) 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 real-world scenarios best illustrates the formation of an ionic bond?

Accepted Answer

Sodium donates an electron to chlorine, forming table salt ($NaCl$).

Question 7

A sample contains 6.02 x $10^{23}$ atoms of an element with atomic number 11 and mass number 23. What is the mass of this sample in grams?

Accepted Answer

23 grams

Question 8

Which of the following statements about covalent bonds is correct?

Accepted Answer

Covalent bonds form when two atoms share one or more pairs of electrons.

Question 9

If a chemical reaction produces water from hydrogen and oxygen gases, and 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 10

A patient accidentally ingests a solution with a pH of 2. Which of the following is the most likely effect on the patient's stomach environment?

Accepted Answer

The solution will increase the stomach's acidity.

Question 11

Which of the following best explains why sodium (Na) and chlorine (Cl) form an ionic bond?

Accepted Answer

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

Question 12

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

Accepted Answer

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

Question 13

A chemist needs to neutralize a solution with a pH of 2. Which of the following substances would be most effective?

Accepted Answer

Adding sodium hydroxide ($NaOH$)

Question 14

Which of the following best describes the trend in reactivity for the noble gases as you move down Group 18 in the periodic table?

Accepted Answer

Reactivity remains very low because all noble gases have full valence shells.

Question 15

Which of the following is a correct statement about acids and bases?

Accepted Answer

A substance with a pH of 2 is a strong acid.

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