Chapter 7 + 8 Test

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How many valence electrons are in an atom of phosphorus?

5

How many valence electrons does a helium atom have?

2

What is the name given to the electrons in the highest occupied energy level of an atom?

valence electrons

How does calcium obey the octet rule when reacting to form compounds?

It gives up electrons

What is the electron configuration of the gallium ion?

1s2,2s2,2p6,3s2,3p6,3d10

What is the charge on the strontium ion?

2+

How many electrons does barium have to give up to achieve a noble gas configuration?

2

What is the formula of the ion formed when potassium achieves noble gas electron configuration?

K+

Which of the following elements does NOT form an ion with a charge of 1+?

Fluorine

How many electrons does nitrogen gain in order to achieve a noble gas electron configuration?

3

What is the formula of the ion formed when phosphorus achieves a noble gas electron configuration?

p3-

How does oxygen obey the octet rule when reacting to form compounds?

It gains electrons

What is the electron configuration of the iodide ion?

1s2,2s2,2p6,3s2,3p6,3d10,4s2,4d10,5s2,5p6

Which of the following occurs in an ionic bond?

Oppositely charged ions attract

What is the net charge of the ionic compound CaF2?

0 because the charge of Ca is 2+ and the charge of F is -1 but since it is F2, the charge is -2. 2+-2 = 0

Which of the following is true about an ionic compound?

All of the above (it is a salt, it is held together by ionic bonds, and it is composed of anions and cations.)

How many valence electrons are transferred from the nitrogen atom to potassium in the formation of the compound potassium nitride?

3

How many valence electrons are transferred from the calcium atom to iodine in the formation of the compound calcium iodide?

2

What is the formula unit of sodium nitride?

Na3N

What is the formula unit of aluminum oxide?

Al2O3

What is the formula for sodium sulfate?

Na2So4

Alloys are commonly used in manufacturing. Which of the following is NOT a reason to use an alloy instead of a pure metal?

Cast iron is more brittle than pure iron

Which of the following compounds has the formula KNO3?

Potassium nitrate

Which of the following pairs of elements is most likely to form an ionic compound?

Magnesium and fluorin

Ionic compounds are normally in which physical state at room temperature?

solid

Which of the following is NOT a characteristic of most ionic compounds?

they have low melting points

Which of the following particles are free to drift in metals?

electrons

What is the basis of a metallic bond?

the attraction of metal ions to mobile electrons

What characteristic of metals makes them good electrical conductors?

they have mobile valence electrons

Which is a typical characteristic of an ionic compound?

the ionic compound has a high melting point

what is shown by the structural formula of a molecule or polyatomic ion?

the arrangement of bonded atoms

Which of these elements does not exist as a diatomic molecule?

Ne (remember H.O.N.Cl.B.R.I.F

How do atoms achieve noble-gas electron configurations in single covalent bonds?

Two atoms share two electrons

Why do atoms share electrons in covalent bonds?

to attain a noble-gas electron configuration

Which of the following is the name given to the pairs of valence electrons that do not participate in bonding in diatomic oxygen molecules?

Unshared pair

A molecule with a single covalent bond is...

Cl2

Once formed, how are coordinate covalent bonds different from other covalent bonds?

There is no difference

When H+ forms a bond with H2O to form hydronium ion H3O+, this bond is called a coordinate covalent bond because...

both bonding electrons come from the oxygen atom

Which of the following covalent bonds is the most polar?

H--F

What is thought to cause the dispersion forces?

motion of electrons

Which of the forces of molecular attraction is the weakest?

Dispersion

What causes dipole interactions

attraction between polar molecules

What are the weakest attractions between molecules?

Van der Waals forces

What causes hydrogen bonding?

bonding of a covalently bonded hydrogen atom with an unshared electron pair

Why is hydrogen bonding only possible with hydrogen?

Hydrogen's nucleus is electron deficient when it bonds with an electronegative atoms.

Which type of solid has the highest melting point?

Network solids

Which of the following atoms acquires the most negative charge in a covalent bond with hydrogen?

O

A bond formed between a silicon atom and an oxygen atom is likely to be...

polar covalent

When placed between oppositely charged metal plates, the region of a water molecule attracted to the negative plate is the...

hydrogen region of the atom

What is the electron configuration of the calcium ion?

1s2,2s2,2p6,3s2,3p6

The octet rule states that, in chemical compounds, atoms tend to have...

the electron configuration of a noble gas

What is the electron configuration of the oxide ion (O2-)?

1s2,2s2,2p6

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