Final Exam

Navigation » List of Schools » Los Angeles Harbor College » Chemistry » Chem 065 – Introductory General Chemistry » Winter 2024 » Final Exam

Need help with your exam preparation?

Existing Quiz Clients Login here

Below are the questions for the exam with the choices of answers:

Try The Exam

Question #1

What is the net ionic equation for the reaction that occurs between ammonium chloride and lead (II) nitrate.

A NH4Cl(aq) + Pb(NO3)2(aq) →PbCl2(s) + NH4NO3(aq)

B Cl-(aq) + Pb2+(aq) →PbCl2(s)

C NH3Cl(aq) + PbNO3(aq) →PbCl(s) + NH3NO3(aq)

D NH4+(aq) + NO3-(aq) → NH4NO3(aq)

E NH4Cl(aq) + PbNO3(aq) →PbCl(s) + NH4NO3(aq)

Question #2

Is carbon tetrachloride a polar or nonpolar molecule?

A nonpolar

B not possible to tell without electronegativity values

C polar

Question #3

The strongest interactions between molecules of hydrogen ( H2) are

A polar covalent.

B ionic bonds.

C dipole-dipole.

D hydrogen bonds.

E dispersion forces.

Question #4

A polar covalent bond is found in which of these compounds?

A H2O

B N2

C H2

D NaCl

E F2

Question #5

The number of electrons in an ion with 20 protons and an ionic charge of 2+ is

A 18

B 16

C 24

D 22

E 20

Question #6

Which of the following measurements clearly shows three significant figures?

A 510 m

B 5100 m

C 0.005 m

D 0.510 m

E 0.051 m

Question #7

The empirical formula of a compound is NO2, and its molar mass is about 92.g. What is its molecular formula?

A N2O

B NO2

C N2O4

D N3O6

Question #8

Which of the following is a property of a solid?

A The particles move at a rapid rate.

B The interactions between its particles are very weak.

C The particles have fixed positions and are very close together.

D It fills the volume of the container.

E It takes the shape of the container.

Question #9

What is the abbreviated electron configuration for tellurium (Te)?

A [Kr] 5s2 4d10 5p4

B [Kr] 5s2 5d10 5p4

C [Sr] 4d10 5p4

D [Cd] 5p4

E [Kr] 5s2 5p6 5d4

Question #10

Predict the products for the following reaction (ignore balancing):

tin(II) nitrate (aq) + potassium phosphate (aq) –> ________________________________

A Sn3(PO4)4 (s) + K (s) + NO2 (g)

B Sn3(PO4)2 (s) + KNO3 (aq)

C SnPO4 (s) + KNO3 (aq)

D Sn3(PO4)2 (aq) + KNO3 (aq)

E No reaction

Question #11

Calculate the mass of acid dissolved in 389 mL of 0.725 M HF.

A 10.3 g

B 5.64 g

C 16.5 g

D 5.93 g

E 5.77 g

Question #12

The +3 ion of indium-111 (111In3+) consist of:

A 62 neutrons, 49 protons and 49 electrons

B 111 neutrons, 46 protons and 49 electrons

C 111 neutrons, 49 protons and 46 electrons

D 62 neutrons, 46 protons and 49 electrons

E 62 neutrons, 49 protons and 46 electrons

Question #13

Urea (CN2H4O) can be synthesized by a controlled reaction of ammonia and carbon dioxide via the following equation:

2 NH3 (g) + CO2 (g) ⟶ CN2H4O (s) + H2O (l) [balanced]

What mass of urea (MM = 60.07 g/mol) will be produced by the reaction of a mixture of 19.0 g of ammonia with 15.2 g of carbon dioxide? (Assume that the reaction goes to completion.)

A 67.0 g

B 20.7 g

C 19.0 g

D 913 g

E 33.5 g

Question #14

The predicted VSEPR molecular shape for CF2O.

A Trigonal Pyramidal

B Tetrahedral

C Square Planar

D Trigonal Planar

E Bent

Question #15

Calculate the pressure exerted by 5.12 grams of chlorine gas in a 850. mL sealed flask at 27.0 ∘C.

A 0.188 atm

B 2.09 atm

C 148 atm

D 4.19 atm

E 20.9 atm

Question #16

Solid mercury(II) oxide decomposes when heated forming liquid mercury and oxygen gas as the only products. What mass of mercury(II) oxide must be decomposed in order to collect 0.386 L of oxygen gas under STP conditions?

A 14.8 g

B 80.5 g

C 7.46 g

D 167 g

E 41.8 g

Question #17

How many individual formaldehyde (CH2O = 30.03 g/mol) are found in a 32.0 mL sample of gaseous formaldehyde? The density of formaldehyde is 0.815 g/mL.

A 6.42 x 1023 molecules

B 0.868 molecules

C 4.72 x 1026 molecules

D 5.23 x 1023 molecules

E 7.87 x 1023 molecules

Question #18

The molecule that contains two sulfur atoms and two chlorine atoms is named:

A disulfur dichlorine

B disulfur dichloride

C disulfide dichlorine

D sulfur chloride

E sulfur monochloride

Question #19

Convert 98.67 gal/m2 to mL/pm2.

A 2.607 x 10-25 mL/pm2

B 3.735 x 10-7 mL/pm2

C 2.607 x 10-20 mL/pm2

D 3.735 x 10-19 mL/pm2

E 3.735 x 10-25 mL/pm2

Question #20

Classify the following reaction:

Li2O (s) + H2O (l) ⟶ 2 LiOH (aq) [balanced]

A Single displacement

B Combustion

C Decomposition

D Combination (Synthesis)

E Double displacement

Question #21

A sample of argon gas in a balloon has a volume of 438 mL at a temperature of 17.0 oC. The gas temperature is then changed, and the volume increases to 837 mL. Assuming constant pressure, what is the new gas temperature in the balloon?

A 8.90oC

B -121oC

C 554oC

D 152oC

E 281oC

Question #22

Which of the following molecules would be expected to observe the highest melting point?

A NH3

B AsH3

C Cannot determine from the information provided.

D CO2

E PH3

Question #23

Consider the combustion of octane (C8H18), given the following unbalanced equation:

_____ C8H18 + _____ O2 ⟶ _____CO2 + _____H2O [unbalanced]

What is the mass of H2O (MM = 18.02 g/mol) will be generated by the complete combustion of 79.8 g of octane in excess oxygen?

A 79.8 g

B 22.7 g

C 4.54 g

D 227 g

E 113 g

Question #24

What is the symbol of the element in Period 4 and Group 2A(2)?

A Be

B C

C Si

D Mg

E Ca

Question #25

Calculate the volume (in cm3) of 358 ng of manganese. The density of manganese is 7.20 g/cm3.

A 2.58 x 10-6 cm3

B 2.58 x 10-9 cm3

C 4.97 x 101 cm3

D 4.97 x 10-8 cm3

E 4.97 x 1010 cm3

Question #26

The conjugate base of HClO3 is

A HClO

B Cl(OH)2

C ClO3-

D ClO3

E HClO2

Question #27

Calculate the pressure exerted by 5.12 grams of chlorine gas in a 850. mL sealed flask at 27.0oC.

A 4.19 atm

B 20.9 atm

C 2.09 atm

D 148 atm

E 0.188 atm

Question #28

Predict the products for the following reaction (ignore balancing):

Zn (s) + CrSO4 (aq) ⟶ ______________________________________

A ZnCr (s) + S8 (s) + O2 (g)

B ZnSO4 (aq) + Cr (s)

C ZnO (s) + Cr (s) + SO3 (g)

D No reaction

E Zn(SO4)2 (aq) + Cr (s)

Question #29

An aqueous solution has a OH- concentration of 2.6 x 10-7 M. Calculate the pH of this solution.

A +0.42

B -7.42

C +6.59

D 6.58

E +7.42

Question #30

During a certain titration, 35.0 mL of 0.175 M aqueous sulfuric acid was required to exactly neutralize 49.0 mL of sodium hydroxide. Determine the molarity of the base.

H2SO4 (aq) + 2 NaOH (aq) ⟶ 2 H2O (l) + Na2SO4 (aq) [balanced]

A 0.600 M

B 6.00 x 10-4 M

C 0.250 M

D 0.125 M

E 0.175 M

Question #31

What is the correct name for SnCO3?

A tin(II) oxalate

B tin carbonate

C tin(II) carbonate

D tin(II) acetate

E tin(IV) carbonate

Try The Exam

Fresh Grad Lands Job as Real Estate Agent With Help from Professional Writers

Need help with your exam preparation?

Below are the questions for the exam with the choices of answers:

Christian S.

Tyra

Linda

Manush

We accept payment