A volume of 10cm3 of ethene gas (C2H4) was exploded with 50cm3 of oxygen. (i) Write the equation of the reaction for the combustion of ethene. (ii)...

A volume of 10cm3 of ethene gas (C2H4) was exploded with 50cm3 of oxygen.

(i) Write the equation of the reaction for the combustion of ethene.

(ii) Calculate the volume of gaseous mixture.

---

---

marto answered the question on September 18, 2019 at 06:07

Exams With Marking Schemes

• Grade 1
• Grade 2
• Grade 3
• Grade 4
• Grade 5
• Grade 6
• Grade 7
• Grade 8
• Grade 9
• PP1
• PP2
• Playgroup
• Form 1
• Form 2
• Form 3
• Form 4

Related Questions

---

• During the electrolysis, a current of 2 amperes was passed through the copper (II) sulphate solution for 4 hours. Calculate the volume of the gas... (Solved)
  

  During the electrolysis, a current of 2 amperes was passed through the copper (II) sulphate solution for 4 hours. Calculate the volume of the gas produced at the anode. (1 F= 96500 C, MGV = 24000cm3).

  Date posted: September 18, 2019 .    Answers (1)

• The solubility of iron (II) sulphate at 22^oC is 15.65g/100g of water. Calculate the mass of iron (II) sulphate crystals in 90g of saturated iron... (Solved)
  

  The solubility of iron (II) sulphate at 22^oC is 15.65g/100g of water. Calculate the mass of iron (II) sulphate crystals in 90g of saturated iron (II) sulphate solution.

  Date posted: September 18, 2019 .    Answers (1)

• Pentanoic acid reacts with butan – 1 – 0l to form an organic compound. (Solved)
  

  Pentanoic acid reacts with butan – 1 – 0l to form an organic compound.
  
  (i) Write an equation to show the above reaction.
  (ii) What is the name given to the above type of reaction?
  (iii) A few drops of a certain catalyst must be added to the mixture to increase the rate of the reaction.
  (a) Name the catalyst.
  (b) Explain the role of the catalyst in the above reaction.

  Date posted: September 18, 2019 .    Answers (1)

• Draw the structures of the following compounds. i) Ethylbutanoate ii) 3-ethyl – 3 – methyl hexane (Solved)
  

  Draw the structures of the following compounds.
  
  i) Ethylbutanoate
  
  ii) 3-ethyl – 3 – methyl hexane
  
  

  Date posted: September 17, 2019 .    Answers (1)

• 100cm3 of0.05M Sulphuric (VI) acid were placed in the flask and small quantity of potassium Carbonate added. The mixture was boiled to expel all carbon... (Solved)
  

  100cm3 of0.05M Sulphuric (VI) acid were placed in the flask and small quantity of potassium Carbonate added. The mixture was boiled to expel all carbon (IV) oxide. 25cm3 of the resulting solution required 18cm3 of 0.1M potassium hydroxide solution to neutralize it. Calculate the mass of potassium carbonate added. (K = 39, O = 16, C = 12)

  Date posted: September 17, 2019 .    Answers (1)

• The products formed by action of heat on nitrates of element X, Y and Z are shown below. (Solved)
  

  The products formed by action of heat on nitrates of element X, Y and Z are shown below.
  
  
  
  a) Arrange the metals in order of increasing reactivity.
  
  b) Which element forms a soluble carbonate?
  
  c) Give an element that can be Y.

  Date posted: September 17, 2019 .    Answers (1)

• a) Draw a diagram to show how an iron ring can be electroplated with pure silver. b)Give two reasons why electroplating is necessary. (Solved)
  

  a) Draw a diagram to show how an iron ring can be electroplated with pure silver.
  
  b)Give two reasons why electroplating is necessary.

  Date posted: September 17, 2019 .    Answers (1)

• Consider the flow chart below; use it to answer the questions that follow. (Solved)
  

  Consider the flow chart below; use it to answer the questions that follow.
  
  
  (i) State the most likely identity of solid F.
  (ii) Write the chemical equation for the reaction between solid F and concentrated nitric (v) acid.
  (iii) Name
  Solution N
  Solution H
  (iv) Write the formula of solution N.

  Date posted: September 17, 2019 .    Answers (1)

• Name the class to which the following cleansing agents belong. (Solved)
  

  a)Name the class to which the following cleansing agents belong.
  
  
  
  b) Which cleaning agent between (i) or (ii) above is preferred for cleaning garments while using water from a dam containing dissolved calcium chloride? Explain
  
  

  Date posted: September 17, 2019 .    Answers (1)

• Describe how a solid mixture of Zinc sulphate and lead (ii) Sulphate can be separated into Solid samples. (Solved)
  

  Describe how a solid mixture of Zinc sulphate and lead (ii) Sulphate can be separated into Solid samples.

  Date posted: September 17, 2019 .    Answers (1)

• Other than cost and ability to conduct, give two other reasons why aluminum is used for making overhead electric cables while magnesium is not. (Solved)
  

  Other than cost and ability to conduct, give two other reasons why aluminum is used for making overhead electric cables while magnesium is not.

  Date posted: September 17, 2019 .    Answers (1)

• A student set up the apparatus as shown in the diagram below to prepare and collect dry ammonia gas. (Solved)
  

  A student set up the apparatus as shown in the diagram below to prepare and collect dry ammonia gas.
  
  
  (i) Identify one mistake in the set-up and give a reason.
  (ii) Name a suitable drying agent for ammonia.
  (iii) Write an operation for the reaction that occurred when a mixture of ammonium chloride and calcium hydroxide was heated.
  (iv) Describe one chemical test for ammonia gas.
  

  Date posted: September 17, 2019 .    Answers (1)

• Study the reaction scheme below and answer the questions that follow. (Solved)
  

  Study the reaction scheme below and answer the questions that follow.
  
  
  
  a) Name; Gas M
  Precipitate w
  
  b) Write an equation for the formation of ;
  
  The white solid
  
  Colorless solution X
  
  c) What name is given to the process that produce precipitate W
  
  d) State two commercial uses of gas M

  Date posted: September 17, 2019 .    Answers (1)

• Below is a simplified diagram of the Downs cell in which sodium metal is manufactured. (Solved)
  

  Below is a simplified diagram of the Downs cell in which sodium metal is manufactured.
  
  
  
  
  (i) Identify electrolyte X and gas Y.
  
  (ii)Give two properties of sodium that make it possible to collect as shown above.
  
  (iii) Why is graphite preferred to steel as the anode?
  
  (iv) Explain how sodium hydroxide pellets would be obtained from sodium amalgam?
  
  

  Date posted: September 17, 2019 .    Answers (1)

• Compute the molar heat of combustion of butane, given that (Solved)
  

  Given that
  
  

  Date posted: September 17, 2019 .    Answers (1)

• The figure below represents a section of the periodic table. Study it and answer the questions that follow. The letters do not represent the actual... (Solved)
  

  The figure below represents a section of the periodic table. Study it and answer the questions that follow. The letters do not represent the actual symbols of elements.
  
  
  
  a) i).What chemical family does element J belong to?
  
  ii. Compare the reactivity of element C and H. Explain.
  
  b)
  i) Write the chemical formula of the chloride of element D
  
  ii) Name the type of structure of the chloride in b(i) above.
  
  c). State and explain the difference in atomic radius and ionic radius of element F
  
  d). Using dots (.) and crosses (x) show how bonding occurs when element E and F react.
  
  

  Date posted: September 17, 2019 .    Answers (1)

• The flow chart below and answer the questions that follow. (Solved)
  

  The flow chart below and answer the questions that follow.
  
  
  
  i). Identify the following;
  
  Gas R
  
  Solid M
  
  Gas J
  
  Liquid S
  
  ii. Write a chemical equation for the formation of gas T
  
  iii. Name catalyst K
  
  iv) State two uses of liquid S
  

  Date posted: September 17, 2019 .    Answers (1)

• 60cm³ of oxygen gas diffused through a porous partition in 50 seconds. How long will it take 120cm³ of sulphur (IV) oxide gas to diffuse... (Solved)
  

  60cm³ of oxygen gas diffused through a porous partition in 50 seconds. How long will it take 120cm³ of sulphur (IV) oxide gas to diffuse through the same partition under the same conditions.

  Date posted: September 17, 2019 .    Answers (1)

• In an experiment magnesium ribbon was reacted with dilute sulphuric (VI) acid and the volume of hydrogen gas produced with time noted. The graph below... (Solved)
  

  In an experiment magnesium ribbon was reacted with dilute sulphuric (VI) acid and the volume of hydrogen gas produced with time noted. The graph below shows the volume of gas produced with time
  
  
  Explain the following observations.
  (i) The curve of the graph is steepest at the beginning.
  (ii) The curve of the graph completely flattens at region AB.
  (iii) On the same axis plot the curve that would be obtained if the acid used was ethanoic acid. Label it ethanoic acid

  Date posted: September 17, 2019 .    Answers (1)

• The table below gives the solubility of potassium bromide and potassium sulphate at 0⁰C and 80⁰C. (Solved)
  

  The table below gives the solubility of potassium bromide and potassium sulphate at 0⁰C and 80⁰C.
  
  
  When an aqueous mixture containing 60g of potassium bromide and 7g of potassium sulphate in 100g of water was cooled from 80⁰C to 0⁰C, some crystals were formed.
  (a) Identify the crystals.
  (b) Determine the mass of crystals formed.
  (c) Name the method used to obtain the crystals.

  Date posted: September 17, 2019 .    Answers (1)