Exam 2

Trends

100

Which of the following is NOT true?

a) The following atoms are listed in order of increasing first ionization energy: In < Si < N < F.

b) Br has a higher first ionization energy than Bi.

c) The third ionization energy for Sc is less than the third ionization energy for Ca.

d) Si would be the third-period element with the following ionization energies: IE1= 578, IE2=1820, IE3=2750 and IE4 = 11600 kJ/mol, IE5 = 14800 kJ/mol.

e) Ionization energies increase with each valence electron removed and are extremely high for noble gases and for the removal of any core electron.

D

200

Which of the following has the largest atomic radius? 

Na, Mg, S, Li, C

Na

300

Which of the following statements is true? 

a) Br has a larger radius than Br^-.

b) Ca²⁺ has a larger radius than Ca.                    

c) The following species are listed in order of decreasing radius: S^2- > Ar > K⁺

 d) The radius of Ar is larger than the radius of Cl^-. 

The following species are listed in order of decreasing radius: S^2- > Ar > K⁺

400

Put the following in increasing bond length within the carbon-oxygen bonds.

CH₃OH CO CO₃2- CH₂O 

CO CH₂O CO₃^2- CH₃OH

500

List the following bonds in order of decreasing polarity: K-Cl, H-F, N-F, H-F

K-Cl > H-F > N-F> N-N

Math MATHY

100

What is the mass percent chromium in potassium dichromate?

35.35%

200

How many atoms of H are in .250 kg of (CH₃)₂SO

1.16E25

300

How many molecules of benzene (C6H6) are in 2.1 L. The density of benzene is 0.876 g/mL

1.42E25

400

A 6.25 g sample of a compound of phosphorus and oxygen contains 3.52 g of phosphorus. The compound has a molar mass of approximately 220 g/mol. What is the molecular formula of the compound?

P₄O₆    

500

Combustion analysis of 62.4 g of a compound made of carbon, hydrogen and oxygen produces 142 g of CO₂ and 58.1 g of water. The compound has a molar mass of 116 g/mol. What is the molecular formula for this compound?

C₆H₁₂O₂

Select All

100

Draw the most favorable lewis dot structure for CH₂F₂. Which of the following statements is/are not true

a. there are 6 non-bonding electrons on the F atom.

b. There are 4 bonding pairs of electrons around the central C atom.

c. Each H atom has a duet of two electrons.

d. There are 12 lone pairs of electrons in the molecule.

e. select this option if all the options are true.

d. There are 12 lone pairs of electrons in the molecule.

200

For which of the following does the most favorable Lewis structure obey the octet rule for all atoms?

a) BeH₂ b) ClF₃ c) PCl₃ d) BF₃ e) XeCl₂

C

300

Consider V, Mo, Cl, As, B. Which has 5 valence electrons?

V and As

400

Here is ClF₄⁺: tell me the molecular geometry, if it is polar or not, what intermolecular forces are present.

polar, seesaw, dispersion, dipole dipole.

500

 Which of the following is nonpolar (has no net dipole)?

a) Cl₂CO b) SO₂ c) ClF₅ d) XeCl₂ e) SCl₄

D.

Naming

100

FeSO₄ x 7H₂O

1. iron(II) sulfate heptahydrate.

200

Mg(H₂PO₄)₂

Magnesium dihydrogen phosphate

300

P₂Br₄

diphosphorus tetrabromide

400

Which of the following is/are named correctly?

CBr₄ is monocarbon tetrabromide

ClF₃ is chlorine trifluoride

S₂Cl₂ is disulfur dichloride

N₂O is nitrogen dioxide

NO₃ is nitrate

ClF₃ is chlorine trifluoride

S₂Cl₂ is disulfur dichloride

500

Which of the following only has single bonds in its Lewis structure?

Ammonium ion

Nitrite ion

Hypochlorite ion

Hydroxide ion

                                   

    

Ammonium ion

Hypochlorite ion

Hydroxide ion

Surprise

100

Which of the following is not a correct name and formula?

Manganese(IV) sulfide MnS₂

Sodium phosphide Na₃P

Tin(IV) chloride SnCl₄

Calcium nitride Ca₃N₂

Cobalt(III) oxide Co₃O₂

Vanadium(V) oxide V₂O₅

Cobalt(III) oxide Co₃O₂

200

Draw three resonance structures for NO₂Br. What are the formal charges for N and Br in the preferred (major) structure?

N: +1 Br:0

300

Which of the following is true?

1. The attraction between positively charged cations and negatively charged anions in CaO would be stronger than SrCl₂ resulting in a smaller (less exothermic) lattice energy.

2. When neutral lithium reacts with neutral chlorine, each atom of lithium gains one electron and each atom of chlorine loses one electron.

3. NH₄NO₃ contains only covalent bonds.

4. In a covalent double bond, two pairs of electrons are shared between atoms.

In a covalent double bond, two pairs of electrons are shared between atoms.

400

Which of the following statements is true?

a) Every element in the halogen group has 6 valence electrons.

b) The noble gas in the 1st period only has valence electrons in the s orbital.            

c) The alkali metal in the 4 period of the periodic table has 2 unpaired electrons.

d) In (atomic number 49) is a metal with its highest energy electrons in the 4d sublevel.

e) Elements in the same group as C have 2 valence electrons in s orbitals and 4 valence electrons in p orbitals.     

The noble gas in the 1st period only has valence electrons in the s orbital.  

500

Which of the following is true?

a) In the most favorable Lewis structure for SO₃^2-, two of the bonds are double bonds.

b) In the most favorable Lewis structure for XeF₄, there are 3 lone pairs of electrons on xenon.

c) In the most favorable Lewis structure for BeF₂, there are 2 double bonds.

d) In the most favorable Lewis structure for NO, there is a triple bond.

e) In the most favorable Lewis structure for PO₄^3-, there are 3 single bonds and one double bond.

E