Chemistry Final Exam MC

When the principle quantum number (n) equals 3, hat are the possible values for the angular momentum quantum number

0,1,2

Give the number of lone pairs around the central atom and the molecular geometry of IF5

1 lone pair, square pyramidal

A molecule of antifreeze, ethylene glycol, has the formula C2H4(OH)2. How many atoms are there in one molecule of antifreeze?

10

The number of nearest neighbors (atoms that make contact) around each atom in a face centered cubic lattice of a metal is

12

The bond angles in (CO3)2- are expected to be

120

The number of atoms in a body-centered cubic unit cell is

2

A central atom with 4 electron pairs could have which of the following geometry 1.) Trigonal bipyramidal 2.)Tetrahedral 3.)Trigonal pyramidal 4.) Bent

2 ,3 , 4

Given the number of lone pairs around a central atom and the molecular geometry of SCl2

2 Lone Pairs, Bent

The number of resonance structures for the nitrate ion that satisfy the octet rule is

3

Given the number of lone pairs around the central atom and the molecular geometry of XeF2

3 lone pairs, linear

The J subshell may hold a maximum of (____) electrons

30

The number of pi bonds in the molecule below is

4

The total number of valance electron in the molecule P2O5

40

How many carbon atoms are in one molecule of CH3(CH2)3CH3

5

How many covalent bonds will be drawn to phosphorous in (PO4) 3- for the dot structure that expands the octet to minimize formal charge and if necessary places negative formal charge on the most electronegative atom(s)

5

How many orbitals are allowed in a subshell if the angular momentum quantum number for electrons in that subshell is 4

9

Define elctronegativity

An atoms ability to attract electrons that are shared in a chemical bond

Which of the following molecules has polar bonds but is a non polar molecule

BF3

Which of the elements listed below would be most likely form a nonpolar covalent bond when bonded to bromine

Br

Which of the following molecules have the same geometries

CO2 BeH2

According to the VSEPR Theory, which on of the following is linear

CS2

Name the compound CuSo4

Copper (II) sulfate

The Bohr model of the hydrogen atom found its greatest support in experimental work an black body radiation

False

Which of the element listed would most likely form a polar covalent bond when bonded to oxygen

H

Which of the following is not true with regard to water

Ice is more dense than liquid water

What is the empirical formula for hydrazine N2H4

NH2

The Lewis structure reveals an unpaired electron (free radical) in which of the following species

NO2

Which one of the following compounds utilizes both ionic and covalent bonding

Na2SO4

The Lewis Structure reveals a double bond in which of the following molecules?

O2

Which of the atoms listed has the smallest radius

P

Which of the following is most likely to be a covalent compound

SF4

Which of the following has the greatest metallic character

Sc

Which of the following is not true of molecular orbitals

The # of molecular orbitals formed is always greater than the number of atomic orbitals combined

Which of the following processes always results in a increase in the energy of a system

The system gains heat and has work done on it by the surroundings

A tentative explanation for a set of observations that can be testes by further experimentation is referred as

a hypothesis

A concise verbal or mathematical statement of a relationship between phenomena that is always the same under the same conditions is referred to as

a law

Which of the following properties indicates the presence of strong intermolecular forces in a liquid

a low vapor pressure

A scientific law is

a statement describing a relationship between phenomena that is always the same under the same conditions

Which of these are examples of physical properties

all of the above

Glass is classified as which of the following

amorphous solid

Given the following quantum number symbol name the number what describe what property of electrons is described by the quantum number Symbol: I

angular momentum quantum number, shape or volume of the orbital

The name for Ba(OH)2 is

barium hydroxide

A chemical change always involves a change in the __________ of mater

composition

Classify the following as an element, a compound, or a mixture: Table Salt (non-iodized)

compound

A face-centered cubic unit cell is the repeating unit in which type of crystal packing

cubic closed-packed

An example of a covalent network solid is

diamond

Classify the following as an element, a compound, or a mixture: Oxygen

element

Delta H symbol used for the heat energy transferred for chemical reaction that occur at constant volume

false

If the frequency is increased the wavelength of a photon will increase

false

Which of the following properties is not influenced by hydrogen bonding

flammability

The name for OH-

hydroxide

W(s) is classified as which of the following

metallic crystal

The name for the NO3- is

nitrate

Name the compound NO2

nitrogen dioxide

Identify the following as a physical change or chemical change: Fashioning a table leg from a piece of wood

physical

What is the sign of delta H for an endothermic reaction?

positive

According to Molecular Orbital Theory, 2 separate 1s orbitals interact to form what molecular orbital?

sigma and sigma*

What is hybridization of the As atom in the AsF5 Molecule

sp3d

which of the following phase change is endothermic

sublimation

Name the compounds SO3

sulfur trioxide

Which property of water allows a razor blade to float on it without sinking?

surface tension

According to the VSEPR Theory, the geometry of the SO3 molecule is

trigonal planar

According to the VSEPR Theory, the geometry of ammonia is

trigonal pyramidal