Exam 2

Trends

100

Define electronegativity

The ability of an atom to gain an electron

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

Which of the following statements is true?                                          

The effective nuclear charge of S is greater than the effective nuclear charge of Al, so the radius of S is larger than the radius of Al.          
b) Ca has a larger effective nuclear charge than Mg, so the radius of Ca is smaller than the radius of Mg.

c) Na has 10 core electrons that shield the valence electron from the nucleus.
d) A valence electron in Si has an effective nuclear charge of +14.
e) The greater the shielding effect for an atom, the stronger the attraction of valence electrons to the nucleus.

                                   

    

                                   

    

Na has 10 core electrons that shield the valence electron from the nucleus.

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

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

1.16E25

200

Determine the amount of atoms in 25.0g of sodium carbonate decahydrate

5.26 x 10²²

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 an 8.505g sample of a compound containing C,H,O produces 11.17g of carbon dioxide and 3.428 of water. What is the empirical formula for this compound?

C₄H₆O₅

Select All

100

Which of the following is/are not true?

Neon is a noble gas, nonmetal, and main group element

Calcium is a main-group and alkaline earth metal

Iron is a transition metal and the main group element

Bromine, Nonmetal, main group element, halogen

Uranium, U is an inner transition metal

Iron is a transition metal and the main group element

200

Which of the following is/are not true?

A valence electron in its ground state in Ga could have the quantum number n=4, l=2, ml=_2, ms= +½.

The halogen in the 5th period has one unpaired electron in its ground state electron configuration.

Zn has two valence electrons in a 4s orbital and 28 core electrons.

Every alkaline earth metal has two paired valence electrons.

Mo has 6 valence electrons, all of which are unpaired

A valence electron in its ground state in Ga could have the quantum number n=4, l=2, ml=2, ms= +½.

300

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

V and As

400

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.

500

Which of the following ground-state electron configurations is correct?

Po: [Rn]6s²4f¹⁴5d¹⁰6p⁴

Cu:[Ar]4s¹4d¹⁰

Xe: [Kr]5s²4d¹⁰5p⁶

S: [Ne}2s²2p⁴

Ge:[Ar]4s²3d¹⁰4p⁴    

Xe: [Kr]5s²4d¹⁰5p⁶

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

What is the % hydrogen by mass in ammonium hydrogen phosphate?

6.87%  

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

A Freon leak in the air conditioning system of an old car releases 2.08 g of CF₂Cl₂ per month. What mass of fluorine does this car emit into the atmosphere each year?

7.84 F/yr