Chemistry Unit 6 Exam

What are three properties of metals that are a result of metallic bonding?

ability to conduct electricity, ability to be reshaped, ability to bend without breaking

Mixing magnesium and aluminum together produces an excellent lightweight material from which to make airplane parts. What is this type of mixture called?

an alloy

In an ionic compound, the attractions between cations and ____________________ hold the compound together.

anions

blah blah blah

blah blah blah

the ability of metal to be hammered into sheets

malleability

An atom will not normally form a chemical bond if it has ____________________ valence electrons.

valence electon

26. How many valence electrons are in silicon?

7

What is the net charge of the ionic compound calcium fluoride? a. 2- c. 0 b. 1- d. 1

C

What is the most important factor in determining how an atom will bond? a. the number of protons b. the number of neutrons c. the number of electrons in the innermost energy level d. the number of electrons in the outermost energy level

D

25. How many valence electrons are in bromine?

1

How many valence electrons are in a silicon atom? a. 2 c. 6 b. 4 d. 8

B

In metallic bonds, the mobile electrons surrounding the positive ions are called a(n) a. Lewis structure. c. electron cloud. b. electron sea. d. dipole.

B

The electron configuration of nitrogen is 1s2 2s2 2p3. How many more electrons does nitrogen need to satisfy the octet rule? a. 1 c. 5 b. 3 d. 8

B

The elements of the ____ group satisfy the octet rule without forming compounds. a. main c. alkali metal b. noble gas d. alkaline-earth metal

B

What do you call a bond that forms when electrons are transferred from one atom to another? a. compound bond c. crystal bond b. ionic bond d. atom bond

B

What is the formula of the ion formed when potassium achieves noble-gas electron configuration? a. K2+ c. K1- b. K d. K2-

B

Write the formula for the compound barium oxide.

BaO

List three properties of ionic compounds.

brittleness, high melting points, high boiling points

In its simplest form, the alloy brass consists of zinc and ____________________.

copper

When cesium and fluorine react, they form an ionic compound called cesium ____________________.

fluoride

When atoms lose electrons in an ionic bond, they become ____________________ charged.

group

An electron in the outermost level of an atom is a(n)

valence electron

An electron that is in the outermost shell of an atom is a(n) ____________________.

valence electron

In ionic compounds, the sum of the charges of all the cations and anions must be ____________________.

zero

How does oxygen obey the octet rule when reacting to form compounds? a. It gains electrons. b. It gives up electrons. c. It does not change its number of electrons. d. Oxygen does not obey the octet rule.

A

How many valence electrons are transferred from the nitrogen atom to potassium in the formation of the compound potassium nitride? a. 0 c. 2 b. 1 d. 3

A

The elements most likely to form more than one type of ion are the a. transition metals. c. halogens. b. alkali metals. d. alkaline earth metals.

A

What is the electron configuration of the iodide ion? a. 1s22s22p63s23p63d104s24p64d105s25p6 b. 1s22s22p63s23p63d104s24p64d10 c. 1s22s22p63s23p63d104s24p64d105s2 d. 1s22s22p63s23p63d104s24p6

A

Which of the following pairs of elements is most likely to form an ionic compound? a. magnesium and fluorine c. oxygen and chlorine b. nitrogen and sulfur d. sodium and aluminum

A

Why does helium need only two valence electrons?

A Helium atom needs only two valence electrons because they fill the energy level, which is also its outermost energy level.

Why can metals bend without breaking? a. Metals contain positively charged ions. b. Metals contain constantly moving or delocalized electrons. c. Metals contain ionic bonds. d. Metals contain moving ions.

B

Most atoms form bonds using which of the following? a. protons c. valence electrons b. electrons d. neutrons

C

The chemical formula for an ionic compound represents the a. number of atoms in each molecule. b. number of ions in each molecule. c. simplest ratio of the combined ions that balances total charges. d. total number of ions in the crystal lattice.

C

What is the charge of an aluminum ion? a. 1+ c. 3+ b. 2+ d. 3-

C

What is the formula unit of sodium nitride? a. NaN c. Na N b. Na N d. NaN

C

What is the same within each group on the periodic table? a.number of protons c.number of atoms b.number of electrons d.number of valence electrons

D

What principle states that atoms tend to form compounds so that each atom can have eight electrons in its outermost energy level? a. rule of eights c. configuration rule b. Avogadro principle d. octet rule

D

Which of the following is true about an ionic compound? a. It is a salt. c. It is composed of anions and cations. b. It is held together by ionic bonds. d. all of the above

D

Which phrase best describes a metallic bond? a. a bond that is formed by a metal b. the attraction between a metal anion and a shared pool of electrons c. a bond that forms between a metal and a nonmetal d. the attraction between a metal cation and a shared pool of electrons

D

Why are metals good conductors of electric current?

Metals contain a shared pool of electrons that are free to move about

Write the formula for the compound rubidium phosphide.

Rb₃P

The chemical formula for calcium chloride, CaCl2, shows that the compound contains two ____________________ ions for every ____________________ ion.

chloride, calcium

the ability of metal to be drawn into wires

ductility

You are given the melting points of three unknown substances and asked to predict which is an ionic compound. You would select the compound with the ____________________ melting point.

highest

The bond formed by the attraction between positively charged metal ions and the electrons around them is a(n) ____________________.

metallic bond

Why is it possible to shape metal?

metallic bonds due to moving electrons allow metal to be shaped

KBr is the formula for an ionic compound. The fact that neither symbol is followed by a subscript means that there is a(an) _________________________ ratio of ions in the compound.

one to one

Which material is most likely to shatter if you strike it with a hammer—sodium chloride or bronze?

sodium chloride

28. How many valence electrons are in aluminum?

6

30. How many valence electrons are in phosphorus?

2

In an electron dot diagram, each dot represents a(an)

2

29. How many valence electrons are in magnesium?

3

On the periodic table, atoms in the same ____________________ have the same number of valence electrons.

3

27. How many valence electrons are in sulfur?

4