Unit 3 Chemical Bonding Pre-assessment

Element X has six electrons in its

outer shell. How could the element react? Select all that apply.

• By gaining two electrons to form a negative ion.

• By losing six electrons to form a negative ion.

• By sharing two electrons with two electrons from

  another element to form a double covalent bond.

• By sharing two electrons with two electrons from

  another element to form four covalent bonds.

• By gaining two electrons to form a cation.

Which of the pairs of elements listed

will form a covalent compound? Select all that apply.

• barium and iodine

• calcium and oxygen

• lithium and chlorine

• oxygen and hydrogen

• carbon and fluorine

Which of the following substances will

conduct electricity when dissolved in water? Select all that apply.

• NaCl

• CO₂

• SiO₂

• NaHCO₃

• C₆H₁₂O₆

Which of the following electron dot

diagrams is incorrect? Select all that apply.

• 
• 
• 
• 
• 

Which substance is a salt, held together by ionic

bonds? Select all that apply.

• LiCl

• C₆H4Cl₂

• SiO₂

• Fe

• Ca(NO₃)₂

Which substance is held together by

metallic bonds? Select all that apply.

• NaCl

• C₆H₄Cl₂

• SiO₂

• Fe

• Brass

Which substance is held together by

covalent bonds? Select all that apply.

• NaCl

• C₆H₄Cl₂

• SiO₂

• Fe

• Brass

What is a property of metals? Select all that apply.

• They form covalent bonds.

• They are malleable.

• They are ductile.

• They have low melting points.

• They are poor conductors of heat and electricity.

What is a property of an ionic compound? Select all that apply.

• They have low melting points.

• They conduct electricity in an aqueous solution.

• They are brittle.

• They do not conduct electricity in the solid state.

• They are made of two nonmetals bonded together.

Which of the following are molecular compounds? Select all that apply.

• KBr

• MgCl₂

• CO₂

• H₂O

• C₆H₁₂O₆