When Lead (II) nitrate crystals is heated strongly the crystals crackle and split because of the gas accumulating inside.

When Lead (II) nitrate crystals is heated strongly the crystals crackle and split because
of the gas accumulating inside.
(i) State three other observations that are made.
(ii) Write an equation for the reaction that takes place when Lead (II) nitrate is
strongly heated.

---

(i)-Clear droplets on cooler part of test tube and brown gas observed
- A colourless gas which relights a glowing splint also formed.
- The solid residue which is red when hot and turns to yellow on cooling is formed.
(ii) 2Pb(NO₂)(s)--------->2PbO(s) + O₂ + 4NO₂(g)

---

sharon kalunda answered the question on May 16, 2019 at 10:11

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

---

• (i) Describe how Lead(II) nitrate is prepared in the Laboratory starting from Lead (II) Oxide. (ii) Write an equation for the reaction that takes place in... (Solved)
  

  (i) Describe how Lead(II) nitrate is prepared in the Laboratory starting from Lead (II) Oxide.
  
  (ii) Write an equation for the reaction that takes place in (i) above

  Date posted: May 16, 2019 .    Answers (1)

• Explain the following. When concentrated sulphulric acid is added to copper turnings and the mixture heated, a reaction takes places producing a blue solution as... (Solved)
  

  Explain the following. When concentrated sulphulric acid is added to copper turnings and the mixture heated, a reaction takes places producing a blue solution as one of the products, but when dilute sulphuric acid is added to copper turnings there is no charge even after heating.

  Date posted: May 16, 2019 .    Answers (1)

• The chart below shows some of the chemical needed for the production of ammonia gas, nitric acid and ammonia sulphate in the industry. (Solved)
  

  The chart below shows some of the chemical needed for the production of ammonia gas, nitric
  acid and ammonia sulphate in the industry.
  
  (a) Name the chemical that should be in chambers 1,2, 4, 6, 8 and 9
  b) State three conditions required to convert the chemical substance in chamber 3 to
  SO₃(g).
  c) Write balanced equations with conditions where necessary for the reactions that
  produces chemical substances in chambers:-
  

  Date posted: May 16, 2019 .    Answers (1)

• The table below shows the atomic numbers of some elements represented by letter J to Q ( letters not their actual symbols). Study and answer the... (Solved)
  

  The table below shows the atomic numbers of some elements represented by letter J to Q ( letters
  not their actual symbols). Study and answer the questions that follow.
  
  a) Write the electronic configuration of
  (i) M
  (ii) P²⁺
  b) Write the formula of the compound formed when L combines with N
  c) How would reactivities of element N and P with chlorine compare? Explain.
  d) Element N combines with oxygen to from an oxide. Using dots (.) and crosses(x) to
  represent the outermost electrons, show how the two elements combine.
  e) Select the most reactive metal and non-metal and give reason for your answer.
  f) State one physical and one chemical property that elements J and Q have in common
  g) What name is given to the group of elements to which element M belong?
  h) (i) Element K consists of two isotopes with relative abundances 75% and 25% and
  mass number 35 and 37 respectively find the relative atomic mass of K.
  (ii) Why is the relative atomic mass of K not a whole number?

  Date posted: May 13, 2019 .    Answers (1)

• The table below shows solubilities of two salts M and N at different temperatures. Study it and answer the questions that follow. (Solved)
  

  The table below shows solubilities of two salts M and N at different temperatures. Study it and
  answer the questions that follow.
  
  A mixture of 55g of salt M in 100g of water and 30g of salt N in 100g of water were cooled from 90^oC to 30^oC . Calculate the mass of salt that crystallize out.

  Date posted: May 13, 2019 .    Answers (1)

• The diagram below shows a Bunsen burner when in use (Solved)
  

  The diagram below shows a Bunsen burner when in use
  
  Which of the labeled parts is used for heating? Give a reason

  Date posted: May 13, 2019 .    Answers (1)

• During the extraction of lead from its ores one of the main ore used is Galena (Solved)
  

  During the extraction of lead from its ores one of the main ore used is Galena
  
  (i) Write an equation for the reaction in roasting furnace.
  (ii) Name gas
  (iii) State one use of lead metal.

  Date posted: May 13, 2019 .    Answers (1)

• Study the scheme below and use it to answer the questions that follows. (Solved)
  

  Study the scheme below and use it to answer the questions that follows.
  
  Write down the formulae of two possible anions present in salt solution P.

  Date posted: May 13, 2019 .    Answers (1)

• During a displacement reaction, excess iron powder was added to 25cm³ of 0.5 M copper (II) sulphate solutions. The temperature rose from 18.5^oC to 33.0^oC.... (Solved)
  

  During a displacement reaction, excess iron powder was added to 25cm³ of 0.5 M copper (II) sulphate solutions. The temperature rose from 18.5^oC to 33.0^oC. Calculate the molar enthalpy of displacement of copper in copper (II) sulphate solution (Specific heat capacity is 4.2 Jg^-1K^-1, Density of the solution = 1.0g/cm³)

  Date posted: May 13, 2019 .    Answers (1)

• Describe how you would prepare crystals of sodium nitrate starting with 200cm³ of 2M sodium hydroxide. (Solved)
  

  Describe how you would prepare crystals of sodium nitrate starting with 200cm³ of 2M
  sodium hydroxide.

  Date posted: May 13, 2019 .    Answers (1)

• The diagram below shows a set –up for preparation of hydrogen chloride gas. (Solved)
  

  The diagram below shows a set –up for preparation of hydrogen chloride gas.
  
  Write the equation for the reaction that produces hydrogen chloride gas.

  Date posted: May 13, 2019 .    Answers (1)

• The following table gives the melting points of oxides of elements in period 3. Study it and answer the questions that follow:- (Solved)
  

  The following table gives the melting points of oxides of elements in period 3. Study it and
  answer the questions that follow:-
  
  (i) Explain the difference in melting points of MgO and P₄O₁₀
  (ii) Name the compound in the above table that will dissolve both in dilute
  hydrochloride acid and dilute sodium hydroxide.

  Date posted: May 13, 2019 .    Answers (1)

• 36cm³ of a solution of potassium hydroxide requires 25cm³ of 0.5M sulphuric acid to neutralize it.Calculate the concentration of alkali in g/dm³ (Solved)
  

  36cm³ of a solution of potassium hydroxide requires 25cm³ of 0.5M sulphuric acid to
  neutralize it.Calculate the concentration of alkali in g/dm³

  Date posted: May 13, 2019 .    Answers (1)

• Draw the structural formula of organic compound with the formula C₅H₁₀O₂ giving its name. (Solved)
  

  Draw the structural formula of organic compound with the formula C₅H₁₀O₂ giving its name.

  Date posted: May 13, 2019 .    Answers (1)

• The diagram below represents set-up that can be used to prepare and collect oxygen gas (Solved)
  

  The diagram below represents set-up that can be used to prepare and collect oxygen gas
  
  a) Name solid P
  b) What property of oxygen makes it possible for its collection as indicated by the
  diagram.
  c) Explain why it is important not to collect any gas for the first few seconds of the
  experiment.

  Date posted: May 13, 2019 .    Answers (1)

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

  Study the flow chart below and answer the questions that follow.
  
  a) Identify N and P
  b) What name is given to the type of halogenation/Chlorination reaction in step 2

  Date posted: May 13, 2019 .    Answers (1)

• During the electrolysis of dilute sulphuric (VI) acid the volume of hydrogen gas collected is twice the volume of oxygen gas. Using half equations justify the... (Solved)
  

  During the electrolysis of dilute sulphuric (VI) acid the volume of hydrogen gas collected is twice
  the volume of oxygen gas. Using half equations justify the above statement.

  Date posted: May 13, 2019 .    Answers (1)

• Under certain conditions ,methane reacts with steam to form carbon (II) oxide and hydrogen only. Calculate the total volume of the gas that can be... (Solved)
  

  Under certain conditions ,methane reacts with steam to form carbon (II) oxide and hydrogen only. Calculate the total volume of the gas that can be formed when 100cm³ of steam reacts completely with methane.
  
  Calculate the enthalpy change of the reaction.
  

  Date posted: May 13, 2019 .    Answers (1)

• Classify the following processes as either chemical or physical. (Solved)
  

  Classify the following processes as either chemical or physical.
  

  Date posted: May 13, 2019 .    Answers (1)

• The equation for dissolution of bismuth(III) chloride in water is (Solved)
  

  The equation for dissolution of bismuth(III) chloride in water is
  
  Explain the effect on the position of equilibrium if sodium hydroxide solution is added to the mixture at equilibrium.

  Date posted: May 13, 2019 .    Answers (1)