Answers 25-26 KCS18 Chemistry ICUnit Test

Unit Test Answers

0 verified answers

Free Preview

TypeError: Failed to fetch

Answer not available

Free Preview

What is the ratio of Al ions to S ions in a neutral compound?

1:1

2:1

2:3

3:2

What is the name of the ionic compound CaO?

calcium oxygen

calcium oxide

calcium(I) oxide

calcium(II) oxide

Which statement describes covalent bases?

They have hydroxide ions.

They produce hydrogen ions.

They are often amines.

They are named the same as ionic compounds.

Which hybrid orbitals would be formed if one s orbital and three p orbitals combined?

sp2

sp3

sp4

Which of these is a property of a substance that is composed of atoms that are held together by ionic bonds?

It can be shaped into wires.

It has a low melting point.

It conducts electricity when in solid form.

It conducts electricity when it is dissolved in water.

Based on its location in the periodic table, what can most likely be predicted about phosphorus?

It has three valence electrons.

It has four valence electrons.

It has five valence electrons.

It has six valence electrons.

How do ionic bonds affect the properties of ionic compounds?

The bonds weakly hold ions together, increasing the melting point.

The bonds strongly hold ions together, reducing the boiling point.

The bonds prevent ions from moving throughout the crystal, so a solid ionic compound is a poor conductor.

The bonds prevent electrons from moving throughout the crystal, so a solid ionic compound is a good conductor.

In water, HNO3 produces H+ ions. Which is the name for HNO3 in an aqueous solution?NameSymbolnitrate NOnitriteNOnitrogenN

hydrogen nitrate

nitric acid

saltpetre

nitrous acid

The incomplete table below shows selected characteristics of different types of bonds.RowBondCausePhysical property of compound1?Electron sharing among many atomsDuctile2?Electron sharing between two atomsBrittle3??BrittleWhat type of bond is most likely being represented in row 1?

ion-dipole

ionic

metallic

covalent

Which of the following compounds would be expected to have the strongest ionic bonds?

the compound that has the largest ions with the greatest charge

the compound that has the largest ions with the least charge

the compound that has the smallest ions with the greatest charge

the compound that has the smallest ions with the least charge

The angle between the hydrogen atoms in water (H2O) is slightly less than expected for a tetrahedral shape. This is because of the

extra electron repulsion from the lone pairs.

atomic radius of the oxygen atom.

additional repulsion of the shared electrons.

extra repulsion of the hydrogen atoms.

Which is the name for SiO2?

silicon dioxide

silicon trioxygen

disilicon dioxygen

monosilicon oxide

The boron atom of BBr3 has

one atomic orbital.

two atomic orbitals.

three hybrid orbitals.

four hybrid orbitals.

The table below shows the electronegativity values of various elements on the periodic table.ElectronegativitiesWhich pair of atoms would form a covalent bond ?

calcium (Ca) and bromine (Br)

rubidium (Rb) and sulfur (S)

cesium (Cs) and nitrogen (N)

oxygen (O) and chlorine (Cl)

Which formula represents the compound commonly known as phosphine with IUPAC name phosphorus trihydride?

PH2

PH3

PH4

Which is the Lewis structure for H3PO4?

mc013-1.jpg

A central upper P is single bonded left, right, above, and below to upper Os. The O above the P is single bonded to upper H on the left and the right, and has two electron dots above it. The O below the P is single bonded to an H below, and has pairs of electron dots to the left and right.

A central upper P is double bonded to an O above, and single-bonded to an upper O single-bonded to an upper H to the left and the right. The O above the P has three pairs of electron dots, to the left, above, and to the right; the O's to the right and left have pairs of dots above and below.

A central upper P is bonded to an upper H above, an upper O below, and upper O's bonded to upper H's to the left and the right. The O below the P has three pairs of electron dots, to the left, right, and below; the other two O's have pairs of dots above and below. A central upper P is double bonded to an O above, and single-bonded to an upper O single-bonded to an upper H to the left and the right. The O above the P has three pairs of electron dots, to the left, above, and to the right; the O's to the right and left have pairs of dots above and below.

Which statement describes how the binary ionic compound KBr is named?

The nonmetal is named first, and the name is unchanged.

The metal is named first, and the name is unchanged.

The nonmetal is named second, and the name is unchanged.

The metal is named second, and the name is unchanged.

What is the chemical formula for zinc (II) phosphate?

ZnP

Zn(PO)

Zn(NO)

Which statement describes a molecule that has a trigonal pyramidal molecular shape?

The molecule has a trigonal planar electron domain geometry with one lone pair.

The molecule has a tetrahedral electron domain geometry with one lone pair.

The molecule has a trigonal planar electron domain geometry with two lone pairs.

The molecule has a tetrahedral electron domain geometry with two lone pairs.

The incomplete table below shows selected properties of compounds that have ionic, covalent, or metallic bonds.RowSubstanceType of bondLikely property1KCl?Brittle2?CovalentDoes not conduct electricity3??MalleableWhich substance would be most suitable for row 3?

sodium chloride (NaCl)

silver (Ag)

nitrogen (N)

propane (CH)

An element has six valence electrons available for bonding. Which group of the periodic table does this element most likely belong to?

group 2

group 4

group 16

group 18

Which compound has the highest melting point?

Al2(CO3)3

C12H22O11

C8H18

H2O

Which statement is true about ionic compounds?

Solid ionic compounds are good conductors of electricity.

Ionic compounds have varying solubilities in water.

Ionic compounds have very low melting points.

Ionic compounds are very easy to bend.

Two molecules have the same molecular geometry but different electron domain geometries. Which combination of atoms and lone pairs around the central atom could describe these molecules?

2 atoms and 2 lone pairs; 3 atoms and 0 lone pairs

1 atom and 3 lone pairs; 2 atoms and 1 lone pair

3 atoms and 1 lone pair; 3 atoms and 0 lone pairs

2 atoms and 2 lone pairs; 2 atoms and 1 lone pair

Did you find these answers helpful?

Unit Test Answers

More from this Course

TRY EDGENUITY HACKS