Mock Exam Set 1 - Paper 1

0.0400 moles of magnesium nitrate $\ce{Mg(NO3)2}$ is dissolved in 500 $cm^3$ of water. What is the resulting concentration of all ions in solution?

• A.$\hspace{1em}$0.240 $mol\ dm^{-3}$

• B.$\hspace{1em}$0.0600 $mol\ dm^{-3}$

• C.$\hspace{1em}$0.160 $mol\ dm^{-3}$

• D.$\hspace{1em}$0.120 $mol\ dm^{-3}$

36.0 $cm^3$ of a 1.00 $mol\ dm^{-3}$ solution of copper (II) nitrate reacts with 0.540 $g$ of aluminum metal.
How many moles of copper metal would be produced in the following reaction?

• A.$\hspace{1em}$0.0360 moles

• B.$\hspace{1em}$0.0300 moles

• C.$\hspace{1em}$0.0200 moles

• D.$\hspace{1em}$0.0133 moles

A molecule has the empirical formula $\ce{CH2}$ and a molecular mass of 56.124 $g\ mol^{-1}$.
Which is NOT a possible structure for this molecule?

• A.$\hspace{1em}$ [© Revision Village 2023. Created using MolView (https://www.molview.org)]

• B.$\hspace{1em}$ [© Revision Village 2023. Created using MolView (https://www.molview.org)]

• C.$\hspace{1em}$ [© Revision Village 2023. Created using MolView (https://www.molview.org)]

• D.$\hspace{1em}$ [© Revision Village 2023. Created using MolView (https://www.molview.org)]

6.00 $g$ of ethane gas (MW 30.07) is placed in a flexible container at STP. The conditions are then changed to a new pressure of 200,000 $Pa$ and a new temperature of 546$K$.
What is the new volume of the container after equilibrating to the new temperature and pressure?
The molar volume of a gas at STP is 22.4 dm$^3$.

• A.$\hspace{1em}$22.4 $dm^3$

• B.$\hspace{1em}$2.24 $dm^3$

• C.$\hspace{1em}$4.48 $dm^3$

• D.$\hspace{1em}$8.96 $dm^3$

Which of the following species has the highest number of unpaired electrons?

• A.$\hspace{1em}$ $Cr$

• B.$\hspace{1em}$ $Cr^{2+}$

• C.$\hspace{1em}$ $Cr^{3+}$

• D.$\hspace{1em}$ $Cr^{6+}$

Which mass spectra would you expect for magnesium (M = 24.3 $g \ mol^{-1}$) ?

• A.$\hspace{1em}$

• B.$\hspace{1em}$

• C.$\hspace{1em}$

• D.$\hspace{1em}$

What is the sum of all coefficients when the equation below is balanced:

• A.$\hspace{1em}$5

• B.$\hspace{1em}$6

• C.$\hspace{1em}$7

• D.$\hspace{1em}$8

Which gives the correct reason and trend in metallic character down group 17?

• 	Trend	Reason
  A.$\hspace{1em}$	Increases	Increasing ionization energy
  B.$\hspace{1em}$	Decreases	Increasing number of electrons
  C.$\hspace{1em}$	Increases	Decreasing ionization energy
  D.$\hspace{1em}$	Decreases	Increasing electron affinity

When added to water, which of the following compounds will result in a solution with a pH below 7?

• A.$\hspace{1em}$ $\ce{MgO}$

• B.$\hspace{1em}$ $\ce{Al2O3}$

• C.$\hspace{1em}$ $\ce{SiO2}$

• D.$\hspace{1em}$ $\ce{P4O10}$

An element has the electron configuration $1s^22s^22p^63s^23p^64s^23d^7$. Which of the below gives this element the correct number of energy levels, block, and group?

• 	Energy levels	Block	Group
  A.$\hspace{1em}$	3	s	2
  B.$\hspace{1em}$	3	d	7
  C.$\hspace{1em}$	4	s	7
  D.$\hspace{1em}$	4	d	9

Carbonate salts are sometimes used as raising agents in cakes.
Which of the following is the correct Lewis structure of the carbonate ion?

• A.$\hspace{1em}$

• B.$\hspace{1em}$

• C.$\hspace{1em}$

• D.$\hspace{1em}$

Potassium and calcium are both solids at room temperature.
Which of the following statements is true?

• A.$\hspace{1em}$Calcium melts at a higher temperature because more valence electrons are delocalized

• B.$\hspace{1em}$Calcium melts at a lower temperature because more valence electrons are delocalized

• C.$\hspace{1em}$Calcium melts at a higher temperature because fewer valence electrons are delocalized

• D.$\hspace{1em}$Calcium melts at a lower temperature because fewer valence electrons are delocalized

Ammonium nitrate is a compound commonly used in fertilizers and explosives. What is the bond angle of the cation in ammonium nitrate?

• A.$\hspace{1em}$104.5$^\circ$

• B.$\hspace{1em}$107.0$^\circ$

• C.$\hspace{1em}$109.5$^\circ$

• D.$\hspace{1em}$120.0$^\circ$

The structural formula of borane ($\ce{BH3}$) is shown.

Which of the following statements is/are true?

• I.$\hspace{1em}$The electron domain geometry of borane is trigonal planar
  II.$\hspace{1em}$The bonds in borane are dative covalent (coordination) bonds
  III.$\hspace{1em}$The boron atom in borane is electron-deficient

• A.$\hspace{1em}$I and II only

• B.$\hspace{1em}$I and III only

• C.$\hspace{1em}$II and III only

• D.$\hspace{1em}$I, II, and III

The structural formulas of three organic compounds, I-III, are shown.

In which of the following are the compounds listed in order of decreasing boiling point?

• A.$\hspace{1em}$II > I > III

• B.$\hspace{1em}$II > III > I

• C.$\hspace{1em}$III > II > I

• D.$\hspace{1em}$III > I > II

Ozone ($\ce{O3}$) can be broken down by the absorption of ultraviolet light. An enthalpy cycle diagram for this reaction is shown.

Which equation would give the correct value for the standard enthalpy change of this reaction, ΔH$_r^\theta$?

• A.$\hspace{1em}$ ΔH$_r^\theta$ = ΔH$_f^\theta$ ($\ce{O2}$) + ΔH$_f^\theta$ ($\ce{O3}$)

• B.$\hspace{1em}$ ΔH$_r^\theta$ = ΔH$_f^\theta$($\ce{O2}$) - ΔH$_f^\theta$ ($\ce{O3}$)

• C.$\hspace{1em}$ ΔH$_r^\theta$ = ΔH$_f^\theta$(O) + ΔH$_f^\theta$ ($\ce{O3}$)

• D.$\hspace{1em}$ ΔH$_r^\theta$ = ΔH$_f^\theta$(O) - ΔH$_f^\theta$ ($\ce{O3}$)

The accurate enthalpy change for the reaction of aqueous hydrochloric acid with solid sodium carbonate is ΔH = -36 $kJ \ mol^{-1}$.

A student tried to determine ΔH by adding 3.00 $g$ of sodium carbonate to 100 $cm^3$ aqueous hydrochloric acid and measuring the temperature change of the solution, ΔT. They obtained an experimental value ΔH$_{exp}$ = -38 $kJ \ mol^{-1}$.

The table shows the values used by the student in their calculation, using $q = mcΔT$.

Which of the following could account for the difference between ΔH and ΔH$_{exp}$?

• A.$\hspace{1em}$The solution density was greater than 1.00 $g\ cm^{-3}$

• B.$\hspace{1em}$The solution mass was increased by the addition of the sodium carbonate

• C.$\hspace{1em}$The heat capacity was less than 4.186 $J g^{-1} K^{-1}$

• D.$\hspace{1em}$The solution lost heat to the surroundings during the reaction

Given enthalpy diagrams for reactions A, B, and C, which of the following statements is correct?

• I.$\hspace{1em}$ Diagrams B and C could represent a catalyst added to reaction A
• II.$\hspace{.7em}$ Reaction A has the greatest activation energy
• III.$\hspace{.4em}$ All reactions are exothermic

• A.$\hspace{1em}$I, II, and, III

• B.$\hspace{1em}$I and II only

• C.$\hspace{1em}$I only

• D.$\hspace{1em}$II only

In an experiment, nitric acid is reacted with sodium hydroxide to form sodium nitrate and water as shown in the equation below:

The table below shows the concentrations of nitric acid measured at different time intervals.

The rate of the reaction is equal to:

• A.$\hspace{1em}$0.125 M s$^{-1}$

• B.$\hspace{1em}$0.500 M s$^{-1}$

• C.$\hspace{1em}$0.250 M s$^{-1}$

• D.$\hspace{1em}$1.25 M s$^{-1}$

In the reaction below, iron speeds up the reaction and remains chemically unchanged at the end of the reaction:

All statements below are true for the role of iron in the above reaction except:

• A.$\hspace{1em}$Iron does not affect the yield of products in the reaction

• B.$\hspace{1em}$Iron provides an alternative pathway for the reaction

• C.$\hspace{1em}$Iron increases the average kinetic energy of the reactants

• D.$\hspace{1em}$Iron lowers the activation energy of the reaction

What will happen to the value of $K_c$ and equilibrium yield of $\ce{HCO3^-}$ if the volume of the reaction vessel is decreased?

• A.$\hspace{1em}$Yield increases, and $K_c$ increases

• B.$\hspace{1em}$Yield decreases, and $K_c$ decreases

• C.$\hspace{1em}$Yield increases, and $K_c$ remains the same

• D.$\hspace{1em}$Yield decreases, and $K_c$ remains the same

$\ce{PCl3}$ and $\ce{Cl2}$ gases are added to a reaction vessel and allowed to reach equilibrium.
What is the relationship between the concentrations of $\ce{PCl3}$ and $\ce{PCl5}$ at equilibrium?

• A.$\hspace{1em}$ $\sqrt{\ce{[PCl3]}}$ = [$\ce{PCl5}$]

• B.$\hspace{1em}$[$\ce{PCl3}$] = $\dfrac{1}{2}$[$\ce{PCl5}$]

• C.$\hspace{1em}$[$\ce{PCl3}$] = 2[$\ce{PCl5}$]

• D.$\hspace{1em}$[$\ce{PCl3}$] = $\sqrt{\ce{[PCl5]}}$

Aluminium oxide ($\ce{Al2O3}$) undergoes the following reactions:

Which of the following is the best description of aluminium oxide?

• A.$\hspace{1em}$Both a Brønsted-Lowry acid and a Brønsted-Lowry base

• B.$\hspace{1em}$A Brønsted-Lowry acid but not a Brønsted-Lowry base

• C.$\hspace{1em}$A Brønsted-Lowry base but not a Brønsted-Lowry acid

• D.$\hspace{1em}$Neither a Brønsted-Lowry acid nor a Brønsted-Lowry base

Using the following table of indicators, what could be the pH of an unknown solution with the following results?

• A.$\hspace{1em}$3.3

• B.$\hspace{1em}$4.0

• C.$\hspace{1em}$6.5

• D.$\hspace{1em}$11

The below diagram shows an electrolytic cell. At which electrode will bromine form, and what is the process taking place there?

The Winkler redox titration method can determine dissolved oxygen levels. Which statement best describes the redox chemistry which occurs in step 1 of the titration shown below:

• A.$\hspace{1em}$ $\ce{Mn^{2+}}$ acts as the oxidizing agent, and $\ce{O2}$ is oxidized

• B.$\hspace{1em}$ $\ce{MnO2}$ acts as the reducing agent, and $\ce{O2}$ is reduced

• C.$\hspace{1em}$ $\ce{O2}$ acts as the reducing agent, and $\ce{Mn^{2+}}$ is oxidized

• D.$\hspace{1em}$ $\ce{Mn^{2+}}$ acts as the reducing agent, and $\ce{O2}$ is reduced

The diagram below shows a Daniel cell. Zinc is more reactive than copper. When the cell is operating, which statement about the ions in the cell is correct?

• A.$\hspace{1em}$Positive ions in the salt bridge diffuse into the copper half cell

• B.$\hspace{1em}$Positive ions in the salt bridge diffuse into the zinc half cell

• C.$\hspace{1em}\ce{Zn^{2+}(aq)}$ ions are deposited at the zinc electrode as $\ce{Zn(s)}$

• D.$\hspace{1em}$The concentration of $\ce{Cu^{2+}(aq)}$ ions increases in the copper half cell

Which of the following groups of molecules all belong to the same homologous series?

• A.$\hspace{1em}\ce{CH3CHO}, \ce{CHOCH2CH2CH3}, \ce{CH3CH2CHO}$

• B.$\hspace{1em}\ce{CH2CH2}, \ce{CH3CHCHCH2CH3}, \ce{CH3CH2CCH}$

• C.$\hspace{1em}\ce{CH3COCH3}, \ce{CH3CHO}, \ce{CH3COCH2CH3}$

• D.$\hspace{1em}\ce{CH3CH2CH2OH}, \ce{CH3CH2CH2CHO}, \ce{CH3CHO}$

Which set of molecules are from the same homologous series $\textbf{and}$ correctly arranged in order of increasing boiling point?

• A.$\hspace{1em}$Ethyne, ethene, ethane

• B.$\hspace{1em}$Butanol, propanol, pentanol

• C.$\hspace{1em}$Dimethylpropane, methylbutane, pentane

• D.$\hspace{1em}$Butanal, ethanal, hexanal

The oxidation of propan-1-ol is a two-stage process. Each stage forms a different product. Which of the following shows the proper product in each stage?

• 	Stage 1	Stage 2
  A.$\hspace{1em}$	Propane	Propyne
  B.$\hspace{1em}$	Propanoic acid	Methyl propanoate
  C.$\hspace{1em}$	Propanoic acid	Propanal
  D.$\hspace{1em}$	Propanal	Propanoic acid