Cambridge & Pearson Edexcel Past Paper Questions
Browse 35,704 questions from Cambridge O-Level & A-Level and Pearson Edexcel IGCSE & IAL exams. Click any question to practice.
The diagram shows the skeletal formula of phenazine. [Figure 21.1] What is the empirical formula of phenazine?
An organic compound X reacts with hot, concentrated acidified potassium manganate(VII) solution to give a single carbon-containing product. What co...
1-chloro-2-methylbutane reacts with sodium cyanide in ethanol in a nucleophilic substitution reaction. What is the most likely intermediate or tran...
Propan-1-ol can be reacted with acidified potassium dichromate(VI) to form propanoic acid, reaction 1, or propanal, reaction 2. [Figure 24.1] How c...
What is the smallest amount of oxygen molecules needed for the complete combustion of 40.0 g of methanol?
The diagram shows the structure of Y. [Figure 27.1] Two suggestions are made about Y. 1 Y can be oxidised by hot, acidified dichromate(VI) ions. 2 ...
Esters can be prepared by the reaction of a carboxylic acid with an alcohol in the presence of concentrated sulfuric acid. Which row gives the corr...
Compound Q can be hydrolysed by HCl(aq). The two products of this hydrolysis have the same empirical formula. What could Q be?
Substance T was analysed and found to contain 62.07% carbon, 10.34% hydrogen and 27.59% oxygen. The infra-red spectrum of substance T is shown. [Fi...
Which gaseous molecules are polar? 1 ammonia 2 hydrogen sulfide 3 boron trifluoride
A carbon monoxide molecule, CO, has three bonds between the carbon atom and the oxygen atom. Which features are present in one CO molecule? 1 two l...
Carbon can exist as allotropes which include graphite, diamond and a fullerene. Which statements are correct? 1 All three allotropes contain covale...
The reaction pathway diagram for a reversible reaction is shown. [Figure 34.1] Which statements are correct? 1 The enthalpy change for the backward...
Silicon forms a tetrachloride, SiCl₄. Which statements are correct? 1 In SiCl₄, the Si is δ+ and each Cl is δ-. 2 SiCl₄ is a liquid at room tempera...
Which statements about ammonia are correct? 1 An ammonia molecule has three bond pairs and one lone pair of electrons. 2 When ammonia is bubbled in...
Following fractional distillation of crude oil, which processes can be used to produce propene from larger hydrocarbon molecules? 1 cracking 2 redu...
Bromoethane undergoes nucleophilic substitution reactions. Which statements are correct? 1 Bromoethane reacts with aqueous NaOH to make ethanol. 2 ...
Which reagents, when used in excess, can convert Y into Z? [Figure 39.1] 1 Na 2 Na₂CO₃ 3 NaOH
Each of the compounds below is treated separately with an excess of NaBH₄. The product of each reaction is then heated with an excess of concentrat...
Answer all the questions in the spaces provided. 1 (a) Chlorine can be prepared using the following reaction. MnO2(s) + 4HCl(aq) → MnCl2(aq) + 2H2O...
2 (a) Complete the table to give details of the type of bonding and structure shown by some of the oxides of Period 3 elements. [Figure 2.1]
3 Crude oil is a natural source of hydrocarbons that are used as fuels. (a) Hydrocarbons with low relative molecular mass, Mr, are used as fuels in...
4 (CH3)3CCHO is used in the synthesis of some antibiotics. (a) (i) Give the name of (CH3)3CCHO. (ii) State the hybridisation of the carbon atom lab...
In the Periodic Table, the p block contains elements whose outer electrons are found in the p subshell.
Oxygen is the most abundant element in the Earth's crust. It reacts with other elements to form stable compounds, ions and molecules.
A series of reactions for phosphorus and its compounds is shown. P ---excess Cl2 reaction 1---> PCl5 ---H₂O reaction 2---> H3PO4 ---NH3 reaction 3-...
Prenol is a naturally occurring organic molecule found in many fruits. It contains both an alkene and an alcohol functional group. [Figure: structu...
Chlorine can be prepared using the following reaction. MnO₂(s) + 4HCl(aq) → MnCl₂(aq) + 2H₂O(l) + Cl₂(g)
(a) Complete the table to give details of the type of bonding and structure shown by some of the oxides of Period 3 elements. | | Na₂O | MgO | Al₂O...
Crude oil is a natural source of hydrocarbons that are used as fuels.
(CH₃)₃CCHO is used in the synthesis of some antibiotics.
In this experiment you will determine the concentration of a sample of hydrochloric acid. You will do this by measuring the volume of hydrogen prod...
In this experiment you will determine the concentration of FA 2 by titration using aqueous sodium hydroxide. HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)...
FA 5 is a salt that contains two different cations and a single anion from those listed in the Qualitative Analysis Notes.
In this experiment you will determine the concentration of a solution of hydrochloric acid by titration with an alkali. FA 1 is a solution contain...
In this experiment you will determine the enthalpy change, ΔH, for the reaction shown. MgO(s) + CO2(g) → MgCO3(s) To do this, you will determine ...
An electrochemical cell is constructed using two half-cells. • an Sn⁴⁺/Sn²⁺ half-cell • an Al³⁺/Al half-cell
When CINO₂ reacts with NO an equilibrium is established. CINO₂(g) + NO(g) ⇌ NO₂(g) + CINO(g) In each CINO₂ molecule the nitrogen atom is bonded to ...
Explain what is meant by the term entropy of a system. [1]
Phenylethanone is an important chemical with many uses. phenylethanone CH₃ O C
Silver sulfide, Ag₂S, is very insoluble in water.
The elements in Group 2 include magnesium, calcium, strontium and barium.
Manganese, chromium and ruthenium are all transition elements.
Proteins are natural polymers. When one particular protein is partially hydrolysed the product mixture includes tripeptide E. tripeptide E HO H N. ...
The structure of butamben is shown. butamben H₂N
An electrochemical cell is constructed using two half-cells. : a Br2/Br- half-cell an Mn³+/Mn2+ half-cell
Explain what is meant by the following terms. half-life of a reaction rate-determining step
Ammonium chloride, NH4Cl(s), dissolves in water to form an acidic solution. This is due to the dissociation of the ammonium ions. NH4+(aq) ⇌ H+(aq)...
The table shows some standard entropy data. substance | standard entropy, S° /J K⁻¹ mol⁻¹ PbO₂(s) | 77 PbO(s) | 69 O₂(g) | 205 Lead(IV) oxide, PbO₂...
Describe fully what would be seen when magnesium and strontium are heated separately in oxygen. magnesium strontium