Unit 3 Review - Bonding & Compounds 2017-18

Which of the following is NOT true about ionic compounds?

• They for a crystalline structure
• They do not conduct electricity as solid
• They are brittle
• They have a low melting point

Chemical compounds must have a net charge of _____.

• 0
• -1
• +1
• The charge of the ions in the compound

Which of the following BEST describes metallic bonds?

• Bond held together by a sea of valence electrons
• Bond of two ions of opposite charges held together by electrostatic forces
• Bond held together by the sharing of electrons
• Bond between hydrogen and an anion or polyatomic ion.

Which of the following BEST describes ionic bonds?

• Bond held together by a sea of electrons
• Bond of two ions of opposite charges held together by electrostatic forces
• Bond held together by the sharing of electrons
• Bond between hydrogen and an anion or polyatomic ion.

Tags

NGSS.HS-PS1-3

Which of the following BEST describes covalent bonds?

• Bond held together by a sea of electrons
• Bond of two ions of opposite charges held together by electrostatic forces
• Bond held together by the sharing of electrons
• Bond between hydrogen and an anion or polyatomic ion.

Tags

NGSS.HS-PS1-4

The melting points of ionic compounds are higher than the melting points of molecular compounds because

• ionic substances tend to vaporize at room temperature
• ionic substances are brittle
• attractive forces between ions are greater than the attractive forces between molecules
• none of these answers

Tags

NGSS.HS-PS1-3

Why do metals conduct

• They are shiny
• The electrons are held tightly within the lattice
• The electrons are delocalised and able to move
• The electrons are shared between two metal ions

Tags

NGSS.HS-PS1-3

According to the octet rule most elements need _______ valence electrons.

• 2
• 8
• 6
• 18

Tags

NGSS.HS-PS1-1

If electrons are shared unequally then the bond is....

• Non-polar covalent
• Ionic
• Non-polar ionic
• Polar covalent

If electrons are shared equally then the bond is....

• Non-polar covalent
• Ionic
• Non-polar ionic
• Polar covalent