CHEM1311 Final Exam Latest 2022

All of the following are properties of oxygen gas. Which one is a physical property?

Ait supports combustion

Bit condenses to a liquid at -219 C and atmospheric pressure

Cit causes iron to rust

Dit reacts with calcium to produce CaO

Eall of these are physical properties

 

Which mixture is incorrectly labeled?

Ahomogeneous/sugar dissolved in water

Bhomogeneous/sand stirred into water

Cheterogeneous/orange juice with pulp

Dheterogeneous/chocolate chip cookie

Eheterogeneous/concrete sidewalk

 

Perform the indicated mathematical operations and express the answer in scientific notation rounded off to the proper number of significant figures:

 

(8.001 X 102) X (2.88 X 103 / 2.4 X 10-3) =

A9.6 X 102

B9.60 X 108

C9.601 X 108

D9.6 X 108

E9.6 X 10-2

 

How many kilograms of lead are there in 749 pounds of lead (1lb = 453.6g)?

A95.1 kg

B340 kg

C760 kg

D28.0 kg

E1650 kg

 

A gold ring has a mass of 15.37 g. If this ring is pure gold (density = 16.1g/mL), what would the volume of the ring be?

A15.37 ml

B1.04 ml

C0.955 ml

D16.1 ml

E8.05 ml

 

Gallium, a metal, has a freezing point near room temperature so it can be melted by holding it in your hands. If gallium's melting point is 302.8 K, what is that temperature in C?

A0.0 C

B575.8 C

C302.8 C

D39.8 C

E29.8 C

 

What is the correct formula for the carbonate ion?

ACH3COO-

BCl-

CCO22-

DCO32-

E(COO-)2

 

Calculate the molar mass of NaHSO4.

A193 amu

B104 amu

C120 amu

D215 amu

E185 amu

 

 

What is the mass of 2.2 X 109 CO2 molecules?

A9.7 X 1010 g

B1.0 X 10-12 g

C1.2 X 10-14 g

D4.4 X 10-14 g

E1.6 X 10-13 g

 

What is percent by mass of sulfur in Al2(SO4)3?

A9.38%

B18.8%

C24.6%

D28.1%

E35.4%

 

A sample of a compound containing nitrogen, hydrogen, and oxygen is found to contain 22.2% nitrogen and 1.59% hydrogen. What is the empirical formula for this compound?

AHNO

BH2N2O3

CH2NO3

DHNO2

EHNO3

 

What is the coefficient for HBr when the following equation is balanced with the smallest whole number coefficients?

Br2 + H2O -> HBr + HBrO3

A5

B7

C8

D3

E6

 

How many moles of O2 are required to burn completely 63.5 g of C6H6, according to the following equation?

 2C6H6 + 15O2 -> 12CO2 + 6H2O

A0.814

B12.2

C6.1

D0.109

E9.21

 

Calculate the molarity of a solution that contains 70.0 g of H2SO4 in 280. mL of solution.

A2.55 M

B6.84 M

C8.62 M

D9.78 M

E11.84 M

 

A laboratory stock solution is 1.50 M NaOH. Calculate the volume of this stock solution that would be needed to prepare 300. mL of 0.200 M NaOH.

A2.25 ml

B10.0 ml

C40.0 ml

D1.00 ml

E0.100 ml

 

Give the number of protons, neutrons, and electrons in a atom of the 90Sr isotope.

A38 p; 38n; 38 e

B38p; 90n; 38 e

C52p; 38n; 52e

D38p; 52n; 38e

E90p; 38n; 90e

 

 

Consider the following statements about atomic structure.  Which is true?

AIsotopes of an element differ only in the number of protons

BThe number of protons in an atom is the atomic number

CThe mass number of an atom is the sum of the number of protons plus electrons in the atom

DThe volume occupied by the nucleus of an atom represents a large percentage of the total volume of the atom

EThe atomic number is the same as the mass number for most elements

 

The orientation in space of an atomic orbital is designated by which quantum number?

An

Bl

Cml

Dms

Epsi

 

The electron configuration 1s22s22p63s23p64s23d6 represents the element ______.

A

Mn

B

Se

C

Fe

DCo

EKr

 

An element that has four valence electrons in its outermost energy shell is _______.

ANb

BMo

CSn

DZr

ES

___ is a noble gas.

A22Ti

B42Mo

C81Tl

D54Xe

E92U

 

Which has the largest atomic radius?

AB

BAl

CGa

DIn

ETl

 

Which element has the lowest first ionization energy?

AF

BCl

CBr

DI

EAt

 

Which ion has the smallest radius?

AK+

BCs+

CSr2+

DBa2+

EAl3+

 

 

 

Which of the following responses contains all the true statements and no others?

 I. The elements at the top right area of the periodic table, except the noble gases, have the greatest tendency to form anions.

II. The elements with the least tendency to form ions are those at the far left of the periodic table.

III. Bonds in compounds consisting of two neighboring or adjacent elements at the top right area of the periodic table are likely to be covalent.

IV. The elements at the far left of the periodic table possess poor electrical conductivity.

AI and III

BI, II and IV

CII and IV

DI, II and III

EIV

 

Write the balanced chemical equation for the complete neutralization of dilute H2SO4 with KOH in aqueous

 solution. What is the sum of the coefficients? (Do not forget coefficients of one.)

A6

B8

C9

D4

E5

 

Which molecule exhibits resonance?

ABeI2

BO3

CH2S

DPCl3

ECO2

 

Which molecule contains the least polar bonds?

 (Electronegativities: H = 2.1, C = 2.5, F = 4.0, Cl = 3.0, Br = 2.8, I = 2.5)

ACF4

BCCl4

CCBr4

DCI4

ECH4

 

Which of the following molecules is nonpolar?

AH2O

BCO2

CCSO

DNF3

ENH3

 

The hybridization associated with the central atom of a molecule in which all the bond angles are 109.5 is _____________

Asp

Bsp2

Csp3

Dsp3d

Esp3d2

 

The electron geometry of the central atom in PCl3 is _____.

Apyramidal

Btrigonal planar

Ctetrahedral

Doctahedral

Etrigonal bipyramidal

 

If the volume of a sample of Ne is tripled while the temperature is held constant, what happens to the pressure of the gas?

Ait triples

Bit stays the same

Cit doubles

Dit's 1/3 the pressure

Eit's 1/2 the pressure

 

A gas sample occupies 4.20L under pressure of 800 torr at 350 K.  At what temperature will it occupy 3.60 L at the same pressure?

A770 C

B300 K

C408 K

D300 C

E770 K

 

A sample of NO2 occupies 11,200 ml at STP. What is the mass of the sample?

A21.0 g

B18.6 g

C23.0 g

D38.6 g

E42.4 g