Practice Paper 1 (DP IB Chemistry: HL)

A periodic table is needed for this question 

Excess aqueous cold sodium hydroxide is reacted with 0.10 mol of chlorine gas, Cl₂. One of the products is a compound of sodium, oxygen and chlorine.

What mass of the product is formed?

Which of the following mixtures is NOT classified as homogeneous?

The atomic number of an element gives the number of protons in the nucleus which is also equal to the number of electrons. Which statement explains why atoms are neutral?

Which transition on the diagram corresponds to the ionisation of hydrogen in the ground state?

Using the Aufbau Principle and Hund’s rule, deduce which element below has the greatest number of unpaired electrons in its ground state.

The second ionisation energy of magnesium is 1451 kJ mol^-1. 

Which equation correctly represents this statement?

Cobalt forms the complex [Co(NH₃)₅Cl]²⁺. Which statements are correct for this complex? 

1.   The cobalt ion acts as a Lewis acid.
2.   The cobalt ion has an oxidation state of +2.
3.   There are 90° bond angles between the cobalt ion and the ligands.

Which of the following statements about butane, CH₃CH₂CH₂CH₃, and propanone, CH₃COCH₃ are correct? 

1. The boiling point of propanone is higher than butane
2. The boiling point of butane is higher than propanone
3. The strongest type of intermolecular force in propanone are permanent dipole permanent dipole forces

Ammonia is a stronger ligand than water. Which statement is correct when concentrated aqueous ammonia solution is added to dilute aqueous copper(II) sulfate solution?

Non-metallic elements in the p block can have the following two properties:

                 property 1        atoms with no paired electrons in 3p

      property 2        have an oxide that can form a strong acid in water

Which properties do phosphorus and sulfur have? 

Which of the following molecules obeys the octet rule?

Which of the following statements are true for XeO₃?

The heat produced by the combustion of magnesium is used to heat some water. 

Which values are needed to calculate the energy transferred during the reaction? 

1. The mass of magnesium
2. The mass of the water
3. The temperature change of the water

Shown below are three enthalpy changes: 

CH₄(g)     +    O₂(g)   →  HCHO(l)   +   H₂O(l)                 ΔH = x 

HCHO(l)   +  ½O₂(g)  → HCOOH(l)                                 ΔH = y 

2HCOOH(l)  +  ½O₂(g)  → (COOH)₂(l) + H₂O(l)             ΔH = z 

Use the information given to deduce the correct expression for the enthalpy change of the following reaction: 

2CH₄(g)   +   3½ O₂(g)    →   (COOH)₂(l)  + 3H₂O(l)

A reaction has a standard entropy change, ΔS^Θ of +10.00 J K^-1 mol^-1. The same reaction has a standard enthalpy change, ΔH^Θ, of +10.00 kJ mol^-1.

Which of the following is used to calculate the value of ΔG^Θ for the reaction in kJ mol^-1?

Which row of the table correctly represents the equations for the lattice enthalpy of substance W₂X and the ionisation energy of atom W?

The Boltzmann distribution shows the number of molecules that have particular kinetic energy at a constant temperature.

If the temperature is decreased by 10 C, what happens to the size of the areas labelled H, J and K?

When 1 cm³ of 0.1 mol dm^–3 HCl is added to 10 cm³ of 0.02 mol dm^–3 Na₂S₂O₃ solution, a pale yellow precipitate forms slowly.

When the experiment is repeated with 1 cm³ of 0.1 mol dm^–3 HCl and 10 cm³ of 0.05 mol dm^–3 Na₂S₂O₃ the precipitate forms more quickly.

Why is this?

The rate information below was obtained for the following reaction at a constant temperature: 

C₂H₅Br (aq) + OH^- (aq) → C₂H₅OH (aq) + Br ^- (aq)

What are the orders of reaction with respect to C₂H₅Br and OH^-?

The following experimental data was collected. 

Which expression correctly calculates the temperature of the reaction?

Which if the following will shift the position of equilibrium to the right in the reaction  shown? 

2N₂O₅ (g)  ⇌ 4NO₂ (g) + O₂ (g)     ΔH = +219.2 kJ 

1.  Decreasing the concentration of NO₂ (g)
2.  Decreasing the temperature
3.  Decreasing the pressure

Which factors will increase the entropy of this system?

CaCO₃ (s)  CaO (s) + CO₂ (g)

I.     Increasing the temperature without changing the volume of the container.

II.     Decreasing the concentration of the gas without changing the volume of the container.

III.     Increasing the pressure without changing the volume of the container.

 What is the sum of the coefficients when the following acid-base equation is balanced?

_HNO₃ (aq) + _Mg(HCO₃)₂ (s) →  _Mg(NO₃)₂ (aq) + _H₂O (l) + _CO₂  (g)

Acid deposition results in leaching of aluminium ions from the soil. Which are true?

1. Al³⁺ ions damage plants roots
2. Al³⁺ ions damage fish gills
3. Al³⁺ ions affect human health

Which of the following statements about indicators are correct? 

1.  The pK_a of the indicator is the midpoint of the pH range
2.  The colour of the indicator depends upon the pH of the solution
3.  At the end point of a titration [HIn] = [In^-]

Which of the following statements about conjugate acid and base pairs are correct?

When solid potassium halides are added to concentrated sulfuric acid, the following reactions take place: 

In each reaction, what is the largest change in the oxidation number of sulfur? 

Which of the following is not a condition for the standard hydrogen electrode (SHE)?

Use the following electrode potentials to answer the question. 

Zn²⁺ (aq) + 2e^- ⇌ Zn (s)      E^θ = -0.76 V

Cl₂ (aq) + 2e^- ⇌  2Cl^- (aq)   E^θ = +1.36 V

Mg²⁺ (aq) + 2e^- ⇌ Mg (s)     E^θ = -2.37 V 

Predict what happens when some powdered zinc is added to aqueous magnesium chloride?

The structure of benzene is often shown as

This is a representation of a resonance hybrid structure that lies between these two possible structures

Evidence for this resonance structure is:

1. The carbon-carbon bond lengths lie between the value for a single and a double bond
2. The bond angles are all equal in benzene
3. The enthalpy of hydrogenation of benzene is less exothermic than expected

What is formed when butanone is heated under reflux with a solution of NaBH₄?

2.30 g of ethanol were mixed with aqueous acidified potassium dichromate(VI) and the desired organic product was collected by immediate distillation under gentle warming. The yield of the product was 50.0%. ( RAMs C= 12, H=1, O=16)

What mass of product was collected?

Which statement is correct about the major reaction between 1-bromobutane, CH₃CH₂CH₂CH₂Br, and dilute sodium hydroxide solution, NaOH (aq)?

What reagents and conditions are needed to convert but-2-ene into butane?

What is name of this compound applying IUPAC rules?

Which of the following reactions produces only pentan-2-ol?

The infrared spectrum of a compound is shown below.

Use the infrared absorptions, in wavenumbers, to identify the compound 

Which compound is shown by the infrared spectrum?

Which of the following produces three peaks in an ¹H NMR spectrum? 

1. CH₃COCH₂CH₃
2. C₆H₅NO₂
3. CH₃CH₂OH

The structure of 2-methylbutan-2-yl 2-methylpropanoate is shown below.

How many signals would be found in the ¹H NMR spectrum of 2-methylbutan-2-yl 2-methylpropanoate and what would be the ratio of the peak areas?