Q-copper is less reactive than iron hence iron reacts faster with oxygen and water leading to rusting
isaacmuthini answered the question on November 28, 2017 at 09:39
- Name the physical process used to obtain salt crystals from a salt solution(Solved)
Name the physical process used to obtain salt crystals from a salt solution.
Date posted: November 28, 2017. Answers (1)
- A piece of burning sulphur was lowered into a gas jar filled with oxygen and containing aqueous litmus solution as shown.(Solved)
A piece of burning sulphur was lowered into a gas jar filled with oxygen and containing aqueous litmus solution as shown.
(a)State two observations made during the experiment.
(b)Write an equation for the burning xof sulphur in air.
Date posted: November 28, 2017. Answers (1)
- Use the diagram below to answer the questions that follow(Solved)
Use the diagram below to answer the questions that follow
(a)After the experiment has been running for some time,record two major observations made in the tube.
(b)Write an equation for the reaction that takes place in the dish containing lead (ii)oxide
Date posted: November 28, 2017. Answers (1)
- In the equation below identify the reagent that acts as an acid and give a reason(Solved)
In the equation below identify the reagent that acts as an acid and give a reason
Date posted: November 28, 2017. Answers (1)
- The diagrams below were used to investigate the effects of sulphur (iv) oxide.(Solved)
The diagrams below were used to investigate the effects of sulphur (iv) oxide.
State and explain the observations made in diagrams (I) and (II)
Date posted: November 28, 2017. Answers (1)
- 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)