Practice Paper 1A (SL IB Chemistry)

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

The diagram shows three orbitals labelled 1, 2 and 3. 

What is the correct label for each orbital?

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

A tube of volume 0.3 dm³ is filled with ethene at 27^oC and 100kPa, the mass of the tube increases by 1.01×10^-3 kg.

Assume the gas is obeying the ideal gas laws.

What is the mass of this sample of gas?

Which is the best description of ionic bonding?

Based on their Pauling electronegativity values, which atom is more likely to form a covalent bond with fluorine?

Which of the following species has the highest melting point?

Ethane has the formula C₂H₆. What is the mass in grams of one molecule of ethane?

(RAMs: C = 12.0; H = 1.0)

 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 following statements about alloys are correct? 

1.   Alloys contain atoms of all the same sizes
2.   An alloy is a mixture of a metal with another element
3.   Alloys are harder than the pure metal they originate from

How many structural isomers are there of tribromopropane, C₃H₅Br₃?

A student opens a freezer in their lab to remove a test tube containing an oxide of a Period 3 element. The oxide is a solid and forms a solution with a low pH when dissolved in water. 

Identify the element.

Give the name of the following molecule

Which graph correctly illustrates a trend found in the halogen group?

In a calorimetric experiment 2.50 g of a fuel is burnt in oxygen. 30 % of the energy released during the combustion is absorbed by 500 g of water, the temperature of which rises from 25 °C to 68 °C. 

The specific heat capacity of water is 4.18 J g^–1 K^–1. 

What is the total energy released per gram of fuel burnt?

Given the following enthalpy changes:

I₂ (s) → I₂ (g)   ∆H^Ɵ = +38 kJ mol^–1 

I₂ (g) + 3Cl₂ (g) → 2ICl₃ (s)   ∆H^Ɵ = –214 kJ mol^–1                  

What is the correct value for ∆H_f^Ɵ of iodine trichloride, ICl₃ (s)? 

Which process converts glucose to ethanol during the production of bioethanol? 

 Using the following information: 

CO (g) + ½O₂ (g) → CO₂ (g)           ∆H^Ɵ  = –283 kJ mol^–1 

H₂ (g) + ½O₂ (g) → H₂O (I)            ∆H^Ɵ  = –286 kJ mol^–1 

H₂O (g) → H₂O (I)                        ∆H^Ɵ = –44 kJ mol^–1 

What is the enthalpy change, ∆H^Ɵ, for the following reaction? 

CO₂ (g) + H₂ (g) → CO (g) + H₂O (g)

Natural gas contains on average 5.5 mg / m³ of sulfur in the form of hydrogen sulfide, H₂S (M_r = 34.09).

If a typical household in the UK consumes 0.198 m³ of gas per day, what is the average annual emission of sulfur in g per household?

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

In a reaction between 1M hydrochloric acid and an excess of marble chips (calcium carbonate) the volume of gas produced was measured against time. This is shown on the dotted line in the graph below.

The experiment was repeated, but this time using the same volume of 2M hydrochloric acid. Which line on the graph represents this experiment?

The diagram below represents, for a given temperature, the Boltzmann distribution of the kinetic energy of the molecules in a mixture of two gases that react slowly together without a catalyst.

The activation energy for the reaction, E_a, is marked for the uncatalysed reaction

What would the position of E_a be if the reaction took place with an effective catalyst?

For the following reaction at equilibrium

H₂S (aq)  +  Mg²⁺ (aq)  ⇋   MgS (s)   +  2H⁺ (aq)              ΔH < 0

Which of the following changes will result in more MgS being produced?

Which of the following substances can be used to prepare magnesium sulfate by a neutralization reaction with dilute sulfuric acid?

1. Mg
2. MgO
3. MgCO₃

Four reactions are shown below. In which reaction is the species shown in bold acting as an oxidising agent?

The following reaction can be used to determine the mass of titanium dioxide in an ore. 

            3TiO₂  +  4BrF₃  →  3TiF₄  +  2Br₂  +  3O₂ 

Which element increases in oxidation number in this reaction?

Which of these compounds would act as a nucleophile?

Which organic product does not form in the following reaction?

C₂H₆ + Cl₂ 

Identify which of the hydrocarbons shown below does not belong in the same homologous series as the other compounds