Physical Science Fall Semester Exam 2024

Valence electrons are found

• in the innermost orbital of an atom

• in the middle orbital of an atom

• in the outermost orbital of an atom

How do covalent bonds form?

• By donating and receiving valence electrons between atoms.

• Scientists still aren't sure.

• Opposite slight charges attract each atom in the compound.

• Sharing valence electrons between atoms

What kind of bond will form between Hydrogen and Oxygen?

• ionic

• covalent

• metallic

• no bond

Tags

NGSS.MS-PS1-1

The bonding between sodium and ​ (a)   would be a/n ​ (b)   bond.

• chlorine
• lithium
• ionic
• covalent

Tags

NGSS.MS-PS1-1

Match the following molecules and compounds to the correct type of chemical bond.

Groups:

(a) Ionic Compound

,

(b) Covalent Molecule

• NaCl

• CCl4

• NO2

• K2O

• MgBr2

• CO2

Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)

• H₃SO₄
• HSO₄
• H₄S₃O
• H₂O

Tags

NGSS.MS-PS1-1

What is the correct chemical formula for aluminum and sulfur?

Tags

NGSS.MS-PS1-1

A student, Billy, is trying to derive the chemical formula between Calcium and Fluorine and determine its chemical bond type. Billy comes to the conclusion that the chemical formula will be Ca2F and it is an ionic bond. State whether you agree or disagree with Billy and provide at least 2 pieces of evidence to support your answer.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The ​ (a)   of attraction between a ​ (b)   ion and a negative ion in an ionic ​ (c)   is an ionic bond.

• positive
• force
• compound
• molecule
• repulsion

Heliium has ​ (a)   valence electrons and needs ​ (b)   electrons to fill its outer shell.

• 2
• 0
• 8
• 1