chem exam two (Wu)

P-Cl

A polar covalent bond would form in which one of these pairs of atoms? P- Cl Ca- Cl Cl - Cl Si - Si

linear

According to the VSEPR model, HCN is predicted to be ___?

trigonal planar

According to the VSEPR model, the molecular geometry of the carbonate ion, CO32-, is

tetrahedral

According to the VSEPR model, the predicted molecular geometry of SiCl4 is

PF5

According to the VSEPR model, which molecule is predicted to have a molecular geometry that is trigonal bipyramidal? SF4 XeF4 PF5 OCl4

a polyatomic anion with oxygen atom(s)

An -ate or -ite at the end of a compound name usually indicates that the compound contains ____.

negative, positive

Anions tend to have a __________ charge and cations tend to have a __________ charge.

a

Arrange the following bonds in order of decreasing polarity: a) H - F > H - O > H - N > H - C b) H - F > H - C > H - N > H - O c) H - C > H - O > H - N > H - F d) H - C > H - N > H - O > H - F

78.08 g/mol

Calcium fluoride, CaF2, is a source of fluorine and is used to fluoridate drinking water. Calculate its formula mass.

283.88 amu

Calculate the molecular mass of tetraphosphorus decaoxide, P4O10, a corrosive substance which can be used as a drying agent.

.305 mol

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH)2.

chromium(III) chloride

Chromium and chlorine form an ionic compound whose formula is CrCl3. The name of this compound is __________.

I2O5

Diiodine pentoxide is used as an oxidizing agent that converts carbon monoxide to carbon dioxide. What is its chemical formula?

6.0 x 10^24

How many ammonium ions, NH4+ , are there in 5.0 mol (NH4)2S?

3.43 x 10^24 atoms

How many atoms are there in 5.70 mol of hafnium?

1.8 x 10^24 ions

How many bromide ions are there in 1.5 moles of MgBr2?

11

How many carbon atoms does 11 molecules of CO2 have?

726

How many carbon atoms does 121 molecules of C6H14 have

7.22 ×10^24

How many carbon atoms does 6.02×10²³ molecules of C12H28 have?

27.3 g

How many grams are contained in a 0.183 mol sample of ammonium phosphate (NH₄)₃PO₄?

1694

How many hydrogen atoms does 121 molecules of C6H14 have?

1.69 x 10^25

How many hydrogen atoms does 6.02×10²³ molecules of C12H28 have?

1.26 x 10^24 molecules

How many molecules are there in 2.1 mol CO2?

3.0 x 10^-4

How many moles of silver atoms are there in 1.8 x 10^20 atoms of silver?

80. moles

How many moles of tungsten atoms are there in 4.8 x 10^25 atoms of tungsten?

22

How many oxygen atoms does 11 molecules of CO2 have?

10

How many total electrons does the Al3+ ion possess?

A

In which molecule is the central atom sp2 hybridized? A. SO2 B. N2O C. BeCl2 D. NF3 E. PF5

tin(IV) fluoride, SnF4

In which of the following is the name and formula given correctly? cobalt chloride, CoCl3 barium nitride, BaN sodium oxide, NaO tin(IV) fluoride, SnF4

sp3

Indicate the type of hybrid orbitals used by the central atom in CCl4.

sp3

Indicate the type of hybrid orbitals used by the central atom in PCl3.

sp3d2

Indicate the type of hybrid orbitals used by the central atom in SF6.

lose, gain

Metals tend to __________ electrons and nonmetals tend to __________ electrons.

S4N2

Tetrasulfur dinitride decomposes explosively when heated. What is its formula?

polar, polar

The CH2F2 molecule has ______ bonds and is a ______ molecule.

nonpolar, nonpolar

The CH4 molecule has _______ bonds and is a __________ molecule

valence electrons

The Lewis dot symbol consists of the symbol for the element surrounded by dot(s). What does the dot or dots represent?

nucleus and inner electrons

The Lewis dot symbol consists of the symbol for the element surrounded by dot(s). What does the symbol represent?

CS2

The Lewis structure for ____ is

NF3

The Lewis structure for _____ is

polar, nonpolar

The PCl5 molecule has _____ bonds and is a _______ molecule.

tetraphosphorus decasulfide

The compound, P4S10, is used in the manufacture of safety matches. What is its name?

FeBr3

The correct formula of iron(III) bromide is

sp

The hybridization of the central nitrogen atom in the molecule N2O is

increases, decreases

The lattice energy for ionic crystals increases as the charge on the ions _____________ and the size of the ions __________________.

Valence Shell Electron Pair Repulsion

What does the abbreviation VSEPR stand for?

Cr(H2PO4)3

What is the correct name for Chromium(III) Dihydrogen Phosphate ?

CrPO4

What is the correct name for Chromium(III) Phosphate

Cr2(HPO4)3

What is the correct name for Chromium(III) hydrogen Phosphate ?

copper (I) nitrate

What is the correct name for CuNO3?

sp3d

What is the hybridization of As in the AsF4- ion?

sp3d

What is the hybridization of the As atom in the AsF5 molecule?

sp3

What is the hybridization of the central atom in ClO3-?

sp2

What is the hybridization on the central atom in NO3-?

tetrahedral

What is the molecular geometry of CF4?

K2S

What is the most likely chemical formula for an ionic compound formed from K+ and S2-?

hypochlorite

What is the name of ClO - ion?

1

What is the number of lone electron pairs on the central atom of a molecule having a seesaw molecular geometry, such as SF4?

T-shaped

What is the predicted molecular geometry of the IBr3 molecule according to the VSEPR model?

5

What is the total number of electron domains around the central atom for a molecule having a T-shaped molecular geometry, such as BrF3?

6

What is the total number of electron domains around the central atom for a molecule having a square pyramidal molecular geometry, such as ClF5?

Roman numeral following the name

When naming a transition metal ion that can have more than one common ionic charge, the numerical value of the charge is indicated by a ____.

sp2

A molecule with the formula AB3 and a trigonal planar molecular geometry uses _________ hybrid orbitals to form its σ bonds.

2-

Oxygen forms an ion with a charge of

AlCl3

Predict the formula of the ionic compound that forms from Aluminum and Chlorine.

CaF2

Predict the formula of the ionic compound that forms from Calcium and Fluorine.

MgO

Predict the formula of the ionic compound that forms from magnesium and oxygen.

linear, nonpolar

Predict the molecular geometry and polarity of the CS2 molecule.

bent, polar

Predict the molecular geometry and polarity of the SO2 molecule.

BeCl2 (fewer energy levels = higher lattice energy = harder crystals)

Which compound has harder crystals, BeCl2 or MgCl2?

Na2S (lower melting pt = lower lattice energy, smaller individual charges = lower melting point)

Which compound will have a lower melting point, Na2S or BeO?

MgS (greater individual charges= greater lattice energy)

Which compound will have the greatest lattice energy, MgS or LiF?

SF2

Which of the following molecules has a nonzero dipole moment? SiO2 SF2 CS2 BeCl2

Ionic compounds tend to form between metals and nonmetals when electrons are transferred from an element with low ionization energy (metal) to an element with a high electron affinity (nonmetal).

Which of the following statement is correct? Question 4 options: Ionic compounds tend to form between metals and nonmetals when electrons are transferred from an element with low ionization energy (metal) to an element with a low electron affinity (nonmetal). Ionic compounds tend to form between metals and nonmetals when electrons are transferred from an element with low ionization energy (metal) to an element with a high electron affinity (nonmetal). Ionic compounds tend to form between metals and nonmetals when electrons are transferred from an element with high ionization energy (metal) to an element with a low electron affinity (nonmetal). Ionic compounds tend to form between metals and nonmetals when electrons are transferred from an element with high ionization energy (metal) to an element with a high electron affinity (nonmetal).

I

Which of these atoms is the LEAST electronegative? Br Cl I F

F

Which of these atoms is the most electronegative? C O N F

E.

Which of these ionic solids would have the highest melting point? A. NaCl B. NaF C. CaBr2 D. CsI E. CaCl2

SO3

Which one of the following molecules has a zero dipole moment? NH3 CO SO2 SO3

SiO2

Which one of the following molecules is nonpolar? SiO2 SO2 HS2 HO2

BrF5

Which one of the following molecules is polar? BrF5 PF5 XeF4 XeF2

CHBr3

Which one of the following molecules is polar? CBr4 CHBr3 CO2 CH4

LiF has higher lattice energy (they have the same charges, but LiF has fewer energy levels)

Why is LiF water insoluble while NaCl water is soluble?

B2(SO4)3

the formula of Boron Sulfate is