Chemistry Midterm Review

Why does the element sodium (Na) readily form compounds? Select TWO correct answers.

• Sodium (Na) has just one valence electron which is easily lost.

• Group 1 elements are the least reactive and form compounds easily.

• Sodium (Na) is found in the most reactive period.

• Losing one electron creates a stable electron arrangement.

• Gaining one electron creates a stable electron arrangement.

Table salt, NaCl, is a common ionic compound. Sodium and chlorine are found in this form together primarily because —

• sodium is missing 1 valence electron needed to form a complete, stable octet shell

• chlorine has 1 additional valence electron it can give away in order to form a complete, stable octet shell

• sodium has 1 additional valence electron it can give away in order to form a complete, stable octet shell

• chlorine can accept 2 – 3 additional electrons per atom to form a stable octet shell

Tags

NGSS.MS-PS1-1

Complete the statement below about the electron dot structure of NaCl. Move the correct answers to the boxes.

Tags

NGSS.MS-PS1-1

Ammonia is a very commonly used covalent compound. It's scientific name is nitrogen trihydride. What is the chemical formula for ammonia?

• HN₄

• NH₃

• H₃N

• NH₄

Tags

NGSS.MS-PS1-1

What is the chemical formula for the carbon tetrachloride?

• CCl₃

• CCl₄

• C₃Cl

• C₄Cl

Tags

NGSS.MS-PS1-1

What is the formula for sodium fluoride?

• NaF

• Na₂F

• NaF₂

• Na₂F₂

Tags

NGSS.MS-PS1-1

What is the formula for iron (II) oxide?

• Fe₂O₂

• Fe₂O

• FeO

• FeO₂

Tags

NGSS.MS-PS1-1

Which of the following is a correct Lewis Dot diagram for an ionic bond?

• A. H :O: H

• B. Na : Cl

• C. :O: Si :O:

• D. Li⁺ : Br⁻

Which of the electron dot structures correctly illustrates diatomic nitrogen with a triple bond?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the shape of a CO₂ molecule?

• linear

• tetrahedral

• trigonal planar

• bent