Phys Sci - Unit 3 pt 2 Exam EC

Barium (2 valence electrons) and chlorine (7 valence electrons) will make what type of bond and how?

• covalent by sharing

• ionic by sharing

• covalent by transferring

• ionic by transferring

Which of the following is a physical property of ionic bonds?

• magetic

• coducts electricty when in solid state

• high melting point

• insoluble in water (can NOT dissolve)

What is the overall net charge for the following compound? Al2O3

• +5

• +2

• -2

• 0

How come when NaCl dissolves in water, it is a good conductor of electricty?

• it separates into ions which are able to carry the charge

• it reacts with water and that produces electricity

• it breaks down the water molecules

• it becomes a covalent bond and those produce electricity

Tags

NGSS.HS-PS1-1

Which of the following is true?

• Ca is a metal and Cl is a nonmetal and they form an ionic bond

• Ca is a metal and Cl is a nonmetal and they form a covalent bond

• Ca is a nonmetal and Cl is a nonmetal and they form a covalent bond

• Ca is a nonmetal and Cl is a nonmetal and they form an ionic bond

If something is able to conduct electricity, dissolve in water, and is usually a solid at room temperature, what type of bond is it?

• Ionic

• Covalent

• Metallic

• It is not a bond

Tags

NGSS.MS-PS1-1

If something has a weaker bond, shared electrons, sometimes dissolves in water, and does not conduct electricity what type of bond is it?

• ionic

• covalent

• metallic

• transition

oxygen has 6 valence electrons and when two oxygen atoms come together to form a bond, what type of bond is it and how?

• ionic with transferring electrons

• covalent with transferring electrons

• ionic with sharing electrons

• covalent with sharing electrons

Tags

NGSS.MS-PS1-1

Which of the following molecules would have the lowest boiling point?

• NaF

• NaCl

• CaO

• H2O

Tags

NGSS.MS-PS3-4

Why are covalently bonded molecules bad conductors of electricity?

• they do not separate into ions

• they usually have high melting and boilint points

• they do not want to bond because they do not have free electrons

• they have no net charge