Chemistry Final Exam Review Pt. 3

A compound held together by ionic bonds is called a ____.

• diatomic molecule

• polar compound

• covalent molecule

• salt

What is the formula unit of aluminum oxide?

• AlO

• Al3O

• AlO3

• Al2O3

Tags

NGSS.MS-PS1-1

Which of the following is true about the melting temperature of potassium chloride?

• The melting temperature is relatively high.

• The melting temperature is variable and unpredictable.

• The melting temperature is relatively low.

• Potassium chloride does not melt.

Tags

NGSS.MS-PS1-4

Which of the following is NOT a characteristic of most ionic compounds?

• They are solids.

• They have low melting points.

• When melted, they conduct an electric current.

• They are composed of metallic and nonmetallic elements.

Which of these elements does not exist as a diatomic molecule?

• Ne

• F

• H

• I

Why do atoms share electrons in covalent bonds?

• to become ions and attract each other

• to attain a noble-gas electron configuration

• to become more polar

• to increase their atomic numbers

Tags

NGSS.HS-PS1-1

Which of the following is the name given to the pairs of valence electrons that do not participate in bonding in diatomic oxygen molecules?

• unvalenced pair

• outer pair

• inner pair

• unshared pair

Which of the following diatomic molecules is joined by a double covalent bond?

• O2

• Cl2

• N2

• He2

Tags

NGSS.HS-PS1-1

When one atom contributes both bonding electrons in a single covalent bond, the bond is called a(n) ____.

• one-sided covalent bond

• unequal covalent bond

• coordinate covalent bond

• ionic covalent bond

A bond formed between a silicon atom and an oxygen atom is likely to be ____.

• polar covalent

• nonpolar covalent

• ionic

• metallic