Chemical Bonds

Ionic Bonds

100

Is a cation positive, negative, or neutral?

Positive

200

Ionic bonds occur between these two types of element:

Metals and Non-metals

300

Which of these is an ionic bond:

Na-Fe, C-O, H-H, K-Br, F-C, Cu-Cu

K-Br

400

Define: Polyatomic ion (and give one example).

A covalently bonded compound with an overall charge. Examples: OH-, SO₄^-2, NO₂-

500

List three physical properties of ionic compounds.

Examples: High solubility, electrolytes, not malleable (shatters when hit), not conductive as a solid, high melting point

Covalent Bonds

100

Covalent bonds occur between these two classes of element:

Non-metals and non-metals

200

Which one of these covalent bonds is NOT polar:

C-F,   O-O,  H-Cl,  S-O

O-O

300

What kind of covalent bond involves the unequal sharing of electrons?

Polar covalent

400

Single, Double, Triple bonds: give an example molecule for each type of covalent bond

Single: F₂

Double: O₂

Triple: N₂

Bonus: Which type of bond can rotate? (200pts)

500

XeF₄ is one of the only covalent compounds formed by a noble gas. Using vocab terms, explain why xenon doesn't normally form bonds, but why it can form bonds with fluorine.

Xenon is a noble gas with 8 valence electrons, so it does not need to form bonds. Fluorine is the most electronegative element, so it is strong enough to pull electrons away from xenon for a bond.

Finding Formulas

100

Write the chemical formula for the compound formed between magnesium (Mg) and oxygen (O).

MgO

200

Write the chemical formula for the compound formed between rubidium (Rb) and selenium (Se).

Rb₂Se

300

Write the chemical formula for the compound formed between boron (B) and oxygen (O).

B₂O₃

400

Write down a representative chemical formula for each type of bond: ionic, covalent, metallic

(Too many examples)

500

Iron (Fe) can form +1, +2, and +3 ions. Write the formulas for the three forms of iron oxide (ionic compound of iron and oxygen).

Fe₂O, FeO, Fe₂O₃

Bonus: What family of elements does iron belong to? (100pt)

Lewis Dot Structures

100

What kind of bond is represented by this model:

Ionic Bond

Bonus: What is the chemical formula? (100pt)

200

Name the compound and type of bond for this molecule:

NH₃, covalent

Bonus: Which side of a polar water molecule would be attracted to nitrogen's lone pair of electrons? (Hydrogen or oxygen side) (100pts)

300

Draw the Lewis Dot Structure for CaBr₂

400

Draw the Lewis Dot Structure for CBr₂F₂

Bonus: Is this a polar or non-polar molecule? (100pt)

500

Draw the Lewis Dot Structure for HCN (hydrogen cyanide).

Odds & Ends

100

Metallic bonds are special because of their ____ of electrons.

Sea of electrons

200

Which one of these is NOT a characteristic of metallic bonds: 

High conductivity, High malleability, High Solubility

High solubility (metals don't dissolve easily in water)

Bonus: What does "ductility" mean in reference to properties of metals? (200pts)

300

List the five shapes that we learned about in the VSEPR model of molecular bonds.

Linear, bent, tetrahedral, trigonal pyramidal, trigonal planar

400

Draw a particle diagram to show the compound MgCl₂ dissolved in water. Show at least 4 water molecules correctly oriented.

Your diagram should have 1 Mg+2 and 2 Cl- ions. Water molecules would surround the ions as below:

500

Determine the shape and polarity of a molecule of PI₃

Trigonal pyramidal, polar