Practice Paper 1 (DP IB Chemistry: SL)

Ethanoic acid has the formula CH₃COOH. How many carbon atoms are present in 0.1 mol of ethanoic acid?

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?

A periodic table is needed for this question

Chicken eggs are made up of 5% by mass of egg shell. The average egg has a mass of 50 g.

Assume that chicken eggshell is pure calcium carbonate. 

How many complete chicken’s egg shells would need to neutralise 50 cm³ of 2.0 mol dm^-3 ethanoic acid?

The phosphide ion,  , is used in medicine as a radiotherapy treatment for some forms of cancer. 

What is the composition of the phosphide ion?

Which statements correctly describe the distribution of mass and charge in the atom?

Which of the following statements describes first ionisation energy?

 The electronegativity of four elements are given below 

N = 3.0       H = 2.1       F = 4.0      P = 2.1      

 What is the correct order of polarity for the following compounds

Which of the species shown below does not have resonance structures?

What is the strongest type of intermolecular force exhibited in the amino acid molecule serine?

Which of the following molecules will have the highest boiling point?

An experiment was carried out to determine the approximate value for the molar enthalpy change of neutralisation. 

75 cm³ of 3.00 mol dm^–3 hydrochloric acid was placed in a polystyrene beaker of negligible heat capacity. Its temperature was recorded, and then 75 cm³ of
3.00 mol dm⁻³ potassium hydroxide at the same temperature was quickly added, and the solution stirred. 

The temperature rose by 14 °C. The resulting solution may be considered to have a specific heat capacity of 4.18 J g^-1 K^-1. 

Which calculation below is correct?

The equations below show the formation of sulfur oxides from sulfur and oxygen. 

S(s) + O₂(g) → SO₂(g)                    = –297 kJ mol^–1 

S(s) + 1½O₂(g) →SO₃(g)                = –395 kJ mol^–1 

What is the enthalpy change of reaction,,of 2SO₂(g) + O₂(g) → 2SO₃(g) in kJ mol^–1?

The reaction pathway for a reversible reaction is shown below:

Which statement is correct?

The diagram shows the skeletal formula of cyclobutane.
 

The enthalpy change of formation of cyclobutane is +75.1 kJ mol^–1, and the enthalpy change of atomisation of graphite is +712 kJ mol^–1.

The bond enthalpy of C–H is 414 kJ mol^–1 and of H–H is 436 kJ mol^–1.

What is the average bond enthalpy of the C–C bond in cyclobutane?

The energies of the reactants, the products and the transition state of a reaction are shown in the reaction pathway diagram below.

Which expression correctly represents how to calculate the activation energy of the forward reaction?

Bleach solution contains sodium chlorate (I) which naturally decomposes according to the equation below:

2NaClO (aq)  → 2NaCl (aq)  +  O₂ (g)

The bleach decomposes faster as the temperature increases. A 100 cm³ sample of 10% bleach was heated to 40 C and the amount of oxygen evolved was measured against time.

The experiment was repeated under the same conditions, but this time using a 100 cm³ sample of 20% bleach. If the first experiment produces the dotted line, which line is produced by the second experiment?

The dissociation of gas X₂Y₄ into XY₂ is represented in the equation below:

X₂Y₄ (g)  ⇌  2XY₂ (g)          = +60 kJ mol^-1 

At constant pressure, if the temperature of the equilibrium mixture of the gases is increased, will the volume of the mixture increase or decrease and why?

The following K_c values were obtained for a reaction carried out at different temperatures, T₁ to T₄.

Which of the following gives the correct amount of products in the mixtures from least to most?

What role does each species play in the equilibrium below according to Brønsted-Lowry theory?

CH₃COOH + HCl  ⇌ CH₃COOH₂⁺ + Cl^-

Four 1.0 M solutions of HCl, NH₃, NaOH and CH₃COOH have been mislabelled, but a student has a pH meter to test the pH of the solutions. Arrange the solutions in order of increasing pH:

The pH of clean rain water is around 5.5. Which substance is responsible for this?

Which row correctly describes oxidation and reduction in terms of the transfer of electrons and changes in oxidation state? 

What is formed at the electrodes during the electrolysis of molten potassium iodide? 

Which features about the members of a homologous series are correct?

1.  all members have the same general formula
2.  the members have similar chemical properties
3.  the members show a gradual change in physical properties

What is the correct IUPAC name for the molecule shown?

In the hydrolysis of bromoethane by aqueous sodium hydroxide, what is the nature of the attacking group and of the leaving group?

A periodic table is needed for this question

Which compound has an M_r of 84.18 and will react with HBr to give a product with an M_r of 165.09?

Bromine exists as two isotopes ⁷⁹Br and ⁸¹Br, which are found in almost equal abundance. 

Which of the following statements is correct?

Which alcohol is likely to have a fragment ion at m/e = 31 in its mass spectrum?