Practice Paper 1A (SL IB Chemistry)

The reaction shown occurs in gas clouds throughout the Universe.

H₂ (g) + H₂⁺ (g) → H (g) + H₃⁺ (g)

Which is the correct atomic structure of the H₃⁺ ion?

What is the electronic configuration of an ion with a single negative charge and atomic number 17?

The diagram below shows the skeletal formula of phenazine.What is the empirical formula of phenazine?

A sample of chlorine gas with a of mass 5.35 g has a volume of 1.247 × 10^-3 m³ at a pressure of 1.00 × 10⁵ Pa.

Assuming that the gas acts as an ideal gas, what is the temperature of the gas in K?

Which of the following statements about ions and ionic compounds are true? 

1.   Nitrogen can form a 3^- ion
2.   Potassium can form a cation
3.   The formula for aluminium chloride is AlCl₂

Hexane, C₆H₁₄ and 2,2-dimethylbutane, CH₃C(CH₃)₂CH₂CH₃, are two isomers of one another and have the same M_r of 86.0. 

Hexane has a higher boiling point than 2,2-dimethylbutane. 

Which of the following statements is not correct?

Sodium and magnesium are both Period 3 elements.

Compared to sodium, why is magnesium more reactive?

A coin contains 5.869% nickel by mass. If the coin weighs 10.00g, how many nickel atoms are in the coin?

Which of the following statements about propanal and propanone are correct?

1. The strongest type of intermolecular force in both molecules is hydrogen bonding
2. The strongest type of intermolecular force in both molecules is permanent dipole permanent dipole forces
3. Both compounds are soluble in water

Using Sections 9 and 17 of the Data Booklet, which of the following predictions about gallium tribromide is/are not correct?

1. It is a poor insulator.
2. It has a high melting and boiling point.
3. It is hard and brittle.

Which of the molecules shown below is not an isomer of pentan-2-ol?

Which statement is not correct?

How many branched-chain isomers are there which have the molecular formula C₅H₁₂?

X, Y and Z represent different halogens. The table shows the results of nine experiments in which aqueous solutions of X₂, Y₂ and Z₂ were separately added to separate aqueous solutions containing X^-, Y^- and Z^- ions.

What is the correct order to show the decreasing strength of the ions X^-, Y^- and Z^-  as reducing agents?

An iron block with a mass of 0.11 kg absorbs 504 J of heat energy. What is the temperature rise in K?

Specific heat capacity of iron = 0.448 J g^–1 K^–1

The hydration enthalpy of anhydrous copper(II) sulfate cannot be measured directly. It can be found indirectly by determining the solution enthalpies of anhydrous and hydrated copper(II) sulfate.

Which are the correct labels for the enthalpies shown in the Hess cycle? 

What is the correct equation for the complete combustion of ethane? 

Iodine trichloride, ICl₃, is made by reacting iodine with chlorine. 

                                    I₂(s) + Cl₂(g) → 2ICl(s)        ∆H^o = +14 kJ mol^–1

                                                ICl(s) + Cl₂(g) → ICl₃(s)      ∆H^o= –88 kJ mol^–1

By using the data above, what is the enthalpy change of the formation for solid iodine trichloride?

When heated, anhydrous magnesium nitrate, Mg(NO₃)₂, will decompose into magnesium oxide and a mixture of gases shown in the following equation

2Mg(NO₃)₂ (s) → 2MgO (s) + 4NO₂ (g) + O₂ (g)

1.48 g of anhydrous magnesium nitrate is heated until no further reaction takes place.

What mass of nitrogen dioxide is produced?

A Group II metal of mass 0.65 g reacted with 606.9 cm³ of oxygen at 273 K and 100 kPa pressure, to form an oxide which contains O^2– ions.

The molar mass of the metal is found using which of the following calculations?

How does the average kinetic energy of a gas vary with temperature?

Four possible energy profiles are shown below, for reactions carried out at the same temperature.

Which energy profile shows a reaction that is likely to proceed most rapidly and with a good yield?

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

_Al₂(CO₃)₃ (s) + _HNO₃ (aq)  ⇌ _Al(NO₃)₃ (aq) + _H₂O (l) +  _CO₂ (g)

In which reaction does hydrogen behave as an oxidizing agent?

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 would be formed when calcium oxide reacts with hydrochloric acid ?

Ultraviolet light initiates the following reaction.

alkane + chlorine → chloroalkane + hydrogen chloride

What happens to chlorine in this photochemical reaction?

Which compound is produced in the reaction between pent-2-ene and steam?