Practice QuizIonic and Covalent

Bonding

Remember….these are our targets (so far)…• Describe how one can identify a compound as ionic or molecular.• Explain the role and location of electrons in a covalent bond.• Describe the change in energy and stability that takes place when a

covalent bond forms.• Explain the difference in single, double and triple covalent bonds.• Distinguish between polar and non-polar covalent bonds based on

electronegativity differences.• Contrast ionic and molecular substances in terms of their physical

characteristics and the types of forces that govern their behavior.• Show the process of how an ionic bond forms.• Explain how properties of ionic compounds depend on the nature of ionic

bonds.• Describe the formation of a salt.• Draw Lewis Dot diagrams (electron dot diagrams) of elements.• Rationalize the properties of a substance based on its type of bonding.

The element represented by [Ar] 4s2 3d10 4p2

Is which element?a. Titaniumb. Siliconc. Germaniumd. Selenium

Has how many valence electrons?a. 2b. 4c. 10d. 12e. 14

The element represented by [He] 2s2 2p4

Would need to share how many electrons with another atom to achieve a noble gas configuration?

a. 2b. 4c. 6d. 8e. None of these are correct.

Use the electron dot diagrams to answer the following question

Which combination of elements would likely form a covalent bond?

a. V and Xb. V and Zc. W and Yd. W and Ze. Y and Z

If two atoms (X and Z) were to covalently bond to each other, what molecule would result?

a. XZb. X2Z3

c. X3Z

d. XZ3

e. It is impossible to answer because atoms of X will not covalently bond .

If two atoms of Y could covalently bond together, what type of bond

would result?

a. a single, polar bondb. a double, nonpolar bondc. a triple, polar bondd. a single, nonpolar bonde. It is impossible to answer because two atoms

of Y will not covalently bond.

Which of the following compounds could be created by ionic bonding?

a. VZb. WYc. XZ3

d. YZ2

e. None of These

Of the electron dots structures below, which would represent an atom of

Sulfur?a. Vb. Wc. Xd. Ye. Z

Which of the electron dots would represent a metal atom?

a. Vb.Wc. Xd.Ye.Z

Covalent bonding normally occurs between which types of elements?

a. metals onlyb. non-metals onlyc. metals and non-metalsd. More than one of these are correct.e. None of these are correct.

Of the three major types of bonding (ionic, covalent, metallic) which ones are

based on electrostatic attractions between opposite charges?

A)only ionic bondingB)only ionic and covalent bondingC)only ionic and metallic bondingD)ionic, covalent and metallic bondingE)none of the above

Ionic compounds normally conduct electricity

A)when in the solid state.B)only when molten.C)when in aqueous solution or molten.D)only when in aqueous solution.E)when a solid or in aqueous solution.

Order the following by decreasing bond length: C≡C, C=C, C-C

A) they are all the sameB) C≡C, C=C, C-CC) C≡C, C-C, C=CD) C-C, C=C, C≡CE) C=C, C-C, C≡C

If a process in salt formation is exothermic, when we write an

equation, where would “energy” appear?

a. On the left side of the arrow b. On the right side of the arrowc. On top of the arrowd. On the reactants sidee. On the products side

Which selection below is an endothermic reaction that occurs

in the formation of a salt?a. Na + energy Na+ + e-

b. Na + e- Na+ + energyc. Cl + energy Cl- + energyd. Cl + e- Cl- + energy

Which of the following is NOT a process in the formation of a salt?

a. Na + energy Na+ + e-

b. Na(s) + energy Na(g)

c. Na+ + Cl- NaCl + energyd. Cl + energy Cl- + e-

Electronegativity is a measure of

A) the energy needed to remove an electron from an atom.B) the energy released when an electron is added to an atom.C) the magnitude of the negative charge on an electron.D) the attraction by an atom for electrons in a chemical bond.E) the magnitude of the negative charge on a molecule.

Which of the following elements is the most electronegative?

A) CB) SiC) AsD) ClE) Sr

Consider an isolated H-C bond in an organic compound. Based on the electronegativities of the two elements, which of the following best describes the net charge on the carbon atom?

A) no polarization of the bond, i.e. no net chargeB) a full negative chargeC) a full positive chargeD) a partial negative chargeE) a partial positive charge

Which one of the following properties is not characteristic of

typical metals?

A) moderately high melting pointB) high boiling pointC) brittlenessD) good electrical conductor when solidE) good electrical conductor when molten

When an atom loses an electron, it

A. becomes a negative ion B. becomes a positive ion C. forms a covalent bond D. gains protons E. becomes a neutral atom

Which of these is a property of an ionic compound?

A. Low melting point B. Poor conductor of electricity C. Crystal shape D. Shared electrons E. Forms a molecule

Ionic compounds have

A. a positive charge B. a negative charge C. no electrical charge D. a changing electrical charge E. a variable electrical charge depending on the

ions involved

What kind of bond is each picture showing?

Covalent Bonds!

Which of the above diagrams is showing a molecule made of double bonds? Answer…

Answer…

Which is showing a molecule made of POLAR bonds?

Answer…

The diagram below is showing what?

AA

C D

BB

The energy changes that occur as a covalent bond forms.

Answer…

Which part of the diagram is showing when a molecule

is most stable?

Answer…BB

This is when the bond is at its lowest energy!!!

The octet rule helps predict the number of electrons an atom will

gain or lose

FalseorTrue

Ionic substances are usually soft and have a low melting point.

True or FalseSo what are some characteristics of

ionic substances?

Are you a bonding

?