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I-red fresh flower changed to white because of being bleached due to presence of water which used to
formation of $SO^(2-)_3$
II-Red dry flower remained red -this is due to absence of water hence bleaching didn't take place due to
absence of $SO^(2-)_3$.
isaacmuthini answered the question on November 28, 2017 at 06:21
- The diagram below shows some apparatus used in the laboratory(Solved)
The diagram below shows some apparatus used in the laboratory
Name the apparatus and state their uses.
Date posted: November 28, 2017. Answers (1)
- The set up below shows the apparatus used for the preparation of nitrogen (i) oxide
(Solved)
The set up below shows the apparatus used for the preparation of nitrogen (i) oxide
(a)(i)Name solid X
(ii)What precautions is taken when heating solid X
(b)Nitrogen (i) oxide does not burn but a magnesium ribbon continues burning in the gas.Explain
Date posted: November 27, 2017. Answers (1)
- Study the set up of apparatus below and answer the questions that follow. (Solved)
Study the set up of apparatus below and answer the questions that follow.
(a)Write the equations for the reaction that occurs in tube V
(b)State one industrial use of gas W
(c)Name another metal that can be used in tube instead of magnessium
Date posted: November 27, 2017. Answers (1)
- The grid below is part of the periodic table.Study it and use it to answer the questions that follow.The letters are not the actual symbols...(Solved)
The grid below is part of the periodic table.Study it and use it to answer the questions that follow.The letters are not the actual symbols of the elements
(i)Which is the most reactive metallic element shown in the table above.Explain
(ii)Write the formula of the compound formed when element E reacts with element G
(iii)What is name given to the group of elements where A,B and C belongs?
Date posted: November 27, 2017. Answers (1)
- Study the table below and answer the questions that follow(Solved)
Study the table below and answer the questions that follow
(i)Select a substance with a giant metallic structure.Explain
(ii)Substance A and C conduct electricity in molten state at room temperature.What is the difference in
their conductivity?
(iii)Select a substance which is in gaseous state.Explain
Date posted: November 27, 2017. Answers (1)
- Study the flowchart below and answer the questions that follow(Solved)
Study the flowchart below and answer the questions that follow
(a)Name;
(i)Solid X
(ii)Solid Y
(iii)Filtrate B
(iv)Solution A
(b)Write down the chemical equations for the reaction taking place in the roaster
(c)Give one use of sodium carbonate
Date posted: November 27, 2017. Answers (1)
- A gas burns with a smooth blue flame when pure but with explosion when impure (a)identify the gas (b)list two industrial sources of the gas(Solved)
A gas burns with a smooth blue flame when pure but with explosion when impure. a)identify the gas.
b)list two industrial sources of the gas
Date posted: November 25, 2017. Answers (1)
- The diagram below was used to electrolyse aqueous magnesium sulphate solution using using graphite electrode (Solved)
The diagram below was used to electrolyse aqueous magnesium sulphate solution using using graphite electrode
Name(i)Gas A-
(ii)Gas B-
(iii)Electrode C
(iv)Electrode D
Date posted: November 24, 2017. Answers (1)
- The table below gives some properties of substances I,II,III and IV.Study it and answer the questions that follows(Solved)
The table below gives some properties of substances I,II,III and IV.Study it and answer the questions that follows
What type of structure exist in substances?
I............................
II...........................
III..........................
IV...........................
Date posted: November 24, 2017. Answers (1)
- Study the reaction scheme below and answer the question that follow(Solved)
Study the reaction scheme below and answer the question that follow
Name(i)Salt A
(ii)Process B
(iii)Solid C
(iv)Brown gas D
(v)Gas E
(VI)Salt in solution F
(VII)Precipitate G
(viii)complex ion in solution H
Date posted: November 24, 2017. 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)Name the substances in mixture L
(b)Name the types of reaction place in step II
Date posted: November 24, 2017. 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)Name
(i)Substance X
(ii)Substance Y
(b)Name
(i)Gas J
(ii)Gas K
(c)Write a chemical equation for the production of
(i)Gas J
(ii)Gas K
Date posted: November 23, 2017. Answers (1)
- A mixture of pentanic acid and pentane were shaken with 0.5mol/l potassium hydroxide solution and let to separate as shown in the diagram below(Solved)
A mixture of pentanic acid and pentane were shaken with 0.5mol/l potassium hydroxide solution and let to separate as shown in the diagram below
(I)Name the main component in layer V
(II)Give reason for your answer in (I) above
Date posted: November 23, 2017. Answers (1)
- The diagram below represents an experiment carried out in the laboratory.Study it carefully and answer the questions that follow(Solved)
The diagram below represents an experiment carried out in the laboratory.Study it carefully and answer the questions that follow
(a)Why is it necessary to boil to boil the water
(b)Identify gas A
(c)After the experiment,blue and red litmus paper were dropped into the water.Explain what was observed
(d)Write a chemical equation for the production of gas A
Date posted: November 23, 2017. Answers (1)
- Study the scheme below and answer the questions that follow: (Solved)
Study the scheme below and answer the questions that follow:
Name;
(i)solid P
(ii)Yellow residue M
(iii)Write a balanced equation for the decomposition of solid P
Date posted: November 23, 2017. Answers (1)
- Study the set up below(Solved)
Study the set up below
(a)Name gas G
(b)Write a balanced equation for the formation of gas G
(c)Name the type of reaction where ultra-violet light energy is part of the reaction
Date posted: November 23, 2017. Answers (1)
- The diagram below shows a set-up which was used by a student to investigate the effect of electricity on molten lead (ii)bromide before and after...(Solved)
The diagram below shows a set-up which was used by a student to investigate the effect of electricity on molten lead (ii)bromide before and after heating the lead (II)bromide
(a)On heating lead (II) bromide,the bulb lit brightly.Before heating,the bulb did not light.
Explain
(b)Write ionic equations to show the reaction taking place on lead(II) bromide
(i)At the anode
(ii)At the cathode
(c)State and explain one important precaution that this student should have taken while performing this
experiment
Date posted: November 23, 2017. Answers (1)
- The diagram below represents a chromatogram of different pigments of leaf extract(Solved)
The diagram below represents a chromatogram of different pigments of leaf extract
(a)Name a suitable solvent for the dye.
(b)State with a reason,the least soluble pigment in the solvent used.
Date posted: November 22, 2017. Answers (1)
- The table below shows PH values of solutions A,B,C and D
(Solved)
The table below shows PH values of solutions A,B,C and D
(a)Which solution Produces bubbles of a gas with zinc metal?Explain
(b)Which solution is the most likely to that of wood ash
Date posted: November 22, 2017. Answers (1)
- 1.2 liters of hydrogen gas produced at room temperature and pressure when 3.27 g of zinc was used.Determine the...(Solved)
1.2 liters of hydrogen gas produced at room temperature and pressure when 3.27 g of zinc was used. Determine the relative atomic mass of zinc.
Date posted: November 22, 2017. Answers (1)