Physical Science 8th Honor Midterm (Chapt. 5 Bonding and Compound /Formulas and Naming Compounds (part of chapter 5)

What is the oxidation number of iron in the compound iron(II) sulfate FeSO4?

+2

Refer to a periodic table. What ratio of ammonium (NH4) to chlorine (Cl-) ions would you expect to find in ammonium chloride?

1:1

Matching: Indicate what type of bond each of the following compounds would form. a. Covalent b. Ionic 34. N2O4 35. KNO3 36. PCI3 37. MgO 38. CH4 39. PbS 40. Na3N

34. covalent 35. Ionic 36. Ionic 37. Ionic 38. covalent 39. Ionic 40. Ionic

How many electrons are shown in the diagram

4

How many atoms are represented by the chemical formula CuSO4?

6

Nitrogen molecule has one triple bond. How many electrons do the nitrogen atoms share?

6

Which is the correct formula for aluminum oxide? (Aluminum has an oxidation state of +3.)

Al2O3

This could be the dot diagram of a. Mg c. O b. C d. Cl

CL

Which of the following is not true regarding chemical bonds?

Chemical bonds form compounds that are less stable than the individual atoms involved.

A polyatomic ion is a group of three or more ionically bonded atoms. a. True b. False

False

All atoms are most stable when they have a full eight electrons in their valence energy level. a. True b. False

False

Metals can have only one oxidation state. a. True b. False

False

Molecules form only when different elements bond together. a. True b. False

False

Most atoms share, gain, or lose valence electrons in order to attain six electrons in their highest energy level. a. True b. False

False

Formulas and Naming Compounds (part of chapter 5)

Focus!!!!!

Refer to a periodic table. Which of the following chemical formulas would most likely represent the ionic compound potassium nitride? a.K3N c.K2N b.KN3 d.KN2

K3N

Why does diatomic nitrogen form triple bonds?

Nitrogen needs three additional electrons to complete its octet.

Which of the following is not a general property of ionic bonding? a. Ionic compounds share electrons relatively equally. b. Ionic bonding occurs between elements with very different electronegativities. c. Ionic bonding forms compounds known as salts. d. Electrons are transferred between atoms.

a. Ionic compounds share electrons relatively equally.

Which of the following would demonstrate exercising wise dominion over the earth? a. using chemical compounds to discover new medicines b. using chemical compounds to create new materials c. using chemical compounds to investigate how the world works d. all the above

all

Which atom is most likely to take valence electrons in ionic bonding?

an atom with high electronegativity

a group of atoms from exactly two different elements bonded together

binary compound

The properties of water are different from the properties of hydrogen and oxygen because

bonding changes the chemical properties.

Which of the following is a true statement regarding chemical bonds? a. Atoms of one kind of element can bond together to gain stability. b. Atoms of two different elements can bond together to gain stability.

both

most often formed between nonmetals

compound

resulting from two atoms sharing electrons

compound

resulting in a molecule

compound

A chemical bond between two nonmetals with similar electronegativity would likely be a(n) __________ bond.

covalent

Two atoms that share electrons form a(n) __________ bond.

covalent

a molecule made of exactly two atoms

diatomic molecule

Chemical bonding preserves the physical and chemical properties of the elements involved. a. True b. False

false

Dangerous chemical compounds have no beneficial use. a. True b. False

false

Ionic bonds form between two cations or two anions. a. True b. False

false

Only one covalent bond can exist between two atoms. a. True b. False

false

between atoms with very different electronegativities

ionic

between oppositely charged ions

ionic

between elements such as transition metals with similar low electronegativities

metallic

resulting in a sea of shared electrons

metallic

Covalent bonding forms __________, while ionic bonding forms __________.

molecules; crystals

a number assigned to an element that shows electric charge gained or lost when forming a compound

oxidation state

a group of covalently bonded atoms that have a net charge

polyatomic ion

What is the correct name for a compound of the acetate ion (C2H3O2) and sodium?

sodium acetate

What is the name for the covalent compound SF6?

sulfur hexafluoride

The lack of a subscript on the first part of the chemical formula NH3 tells you that

the compound currently has one nitrogen atom.

In an ionic bond between an alkali metal atom and a nonmetal atom, the anion is __________.

the nonmetal atom

The octet rule states that atoms are generally most stable when

they have eight electrons in their valence energy level.

:N=N: represents a diatomic molecule with a triple covalent bond. a. True b. False

true

Compounds are usually more stable than the individual atoms that make up the compound. a. True b. False

true

Electrons shared in covalent bonds are not necessarily equally shared. a. True b. False

true

Most atoms are unstable when they are not bonded to other atoms. a. True b. False

true

Refer to a periodic table. What ratio of atoms (ions) would you expect to find in potassium sulfide?

two atoms of potassium for every one atom of sulfur

The electronegativities of the elements in an ionic bond tend to be __________.

very different