Practice Paper 1 (DP IB Chemistry: SL)

A compound of molar mass 92 gmol^-1 contains 12g of carbon, 2g of hydrogen and 32g of oxygen. What is the molecular formula of the compound?

A periodic table is needed for this question

A 2.27 dm³ sample of nitrogen gas, measured under standard conditions, reacted with a large excess volume of hydrogen gas to produce ammonia. Only 20.0% of the nitrogen gas reacted to produce ammonia.

What mass of ammonia was made?

A periodic table is needed for this question

When a 1.00 g sample of carbon is burned in a limited supply of oxygen, 0.72 g of the carbon combusts to form CO₂ and 0.28 g of the carbon combusts to form CO_.

These gases were passed through excess NaOH(aq) which absorbs the CO₂, but not the CO. The remaining gas was then dried and collected.

Assuming that all gas volumes were taken at 25˚C and 100 kPa pressure, what was the volume of gas at the end of the reaction? (Molar Volume of a gas at rtp = 24 dm³)

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?

Element X is in period 2 and has the first seven ionisation energies in kJ mol^-1 as shown.

What is the electronic configuration of element X?

Which statement correctly describes the trend in metallic radius in group I elements
Na to Rb?

1. Increases moving down the group
2. Increases moving down due to the addition of electron shells
3. Decreases moving down due to increasing nuclear forces

Phosphine, PH₃, can react with a hydrogen ion, H⁺, to form the phosphonium ion.

Which type of bond is formed in this reaction?

Which of the following statements about graphite are correct? 

1.    The carbon atoms are joined together by three covalent bonds
2.    Graphite contains delocalised electrons
3.    The C-C-C bond angle is 109.5^o

The properties of alloys can be explained in terms of metals having

1. Non-directional bonding
2. Delocalised electrons
3. Ions of different size

A student mixed 30.0 cm³ of 0.0250 mol dm^-3 potassium hydroxide solution with 30.0 cm³ of 0.0250 mol dm^-3 nitric acid. The temperature rose by 0.50 ^oC. Assume no heat was lost to the surroundings. 

The mixture had a specific heat capacity of 4.18 J g ^-1 K^-1. 

What is the molar enthalpy change for the reaction?

The reaction of hydrochloric acid with sodium hydroxide produced an overall temperature increase of 24.4 K. 

Given the following data, how much thermal energy was evolved during this reaction? 

Initial temperature of 25.0 cm³ hydrochloric acid = 17.6 ^oC

Initial temperature of 25.0 cm³ sodium hydroxide = 18.5 ^oC 

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

The first stage in the industrial production of nitric acid from ammonia can be represented by the following equation. 

4NH₃(g)  +  5O₂(g)  ⇌  4NO(g)  +  6H₂O(g) 

Using the following standard enthalpy change of formation data, what is the value of the standard enthalpy change  for this reaction?

Which equation correctly shows how the bond energy for the covalent bond Y–Z can be calculated by dividing ΔH by n?

The dotted-line curve on each graph below represents the corresponding distribution for a gas at 300 K.

Which solid-line curve most accurately represents the distribution of molecular energies in the same gas at 500 K?

1 dm³ of gas X and 1 dm³ of gas Y are kept at the same temperature and pressure.

The speed of the molecules is plotted against the fraction of molecules with that speed. From the graph what can be said about the two gases?

Hydrogen reacts with iodine according to the following equation

H₂ (g)  + I₂ (g)   ⇋   2HI (g)

The value of K_c for this reaction has been measured at different temperatures

K_c  =  60  at 355 C

K_c  =  47  at 450 C

From the information given which of the following must be true?

The following reaction occurs between concentrated sulfuric and nitric acids.

H₂SO₄ + HNO₃ ⇋  H₂NO₃⁺ + HSO₄^-

Identify the two species which are acting as Brønsted–Lowry bases.

Calculate the pH of a solution of NaOH of concentration 0.001 mol dm^-3

Acid rain can be up to 50 times more acidic than normal rain, which has a pH around 5.5. What is the approximate concentration of H⁺ in acid rain?

The chemistry of the Group VII elements often involves redox processes.

Which of the following statements is correct?

Below are four descriptions about the movements of electrons in voltaic cells.

Which is the correct statement?

How many isomeric esters have the molecular formula C₅H₁₀O₂?

What is the correct condensed structural formula for 2,2-dibromo-4-methylhexane?

In the presence of ultraviolet light, ethane and chlorine react to give a mixture of products.

Which compound could be present in the mixture of products?

Dichlorodifluoromethane, CCl₂F₂, has been used in aerosol propellants and as a refrigerant.

Which statement helps to explain why dichlorodifluoromethane is chemically inert?

Samples of 10 cm³ of each of the first four members of the alkane series are separately mixed with 70 cm³ of oxygen. Each is then burned and the total volume, V, of residual gas measured again at room temperature and pressure.

Which graph represents the results that would be obtained?

Chlorine has two isotopes ³⁵Cl and ³⁷Cl.  Assuming in the molecule C₄H₆Cl₄ there is only one hydrogen and one carbon isotope, how many molecular ion peaks will be seen in its mass spectrum?

The mass spectra of three compounds A, B and C are shown below.

What evidence from the spectra of the three compounds A, B and C, suggests they could be isomers?