(i) Changes form orange to Green
(ii) Effervescence//bubbles of gas produced
maurice.mutuku answered the question on October 22, 2019 at 05:44
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Give the systematic names of the following compounds:-
Date posted: October 22, 2019. Answers (1)
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Use the diagram below to answer the questions that follow:
(i) Name another source of hydrogen apart from electrolysis of water
(ii) What conditions are necessary for step III to occur?
(iii) Write the equation for the formation of colourless gas Q
Date posted: October 22, 2019. Answers (1)
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Given the reaction:
(i) Identify substance and F and N
(ii) Name the process represented above?
(iii) Give one use of substance N
Date posted: October 18, 2019. Answers (1)
- (i) Complete the equation below :
CH3COOCH3 + H2O
(ii) What type of reaction is occurring above(Solved)
(i) Complete the equation below :
CH3COOCH3 + H2O
(ii) What type of reaction is occurring above
Date posted: October 18, 2019. Answers (1)
- The set-up below was used to prepare ethyne gas(Solved)
The set-up below was used to prepare ethyne gas
(i) Identify solid E
(ii) Complete the diagram to show how the gas can be collected
(iii) Write an equation to show how the gas is formed
(iv) Complete the equation below: )
C2H2 + 2I2---------------->
(v) What is the role of sand in the experiment?
Date posted: October 18, 2019. Answers (1)
- The diagram below represents a large-scale fractional distillation plant used to separate the components A, B, C and D in a mixture(Solved)
The diagram below represents a large-scale fractional distillation plant used to separate the components A, B, C and D in a mixture
The components have the following average relative molecular masses not necessarily in that
order; 282, 184, 44 and 128.
(i) What is the physical state of B at the position marked Q?
(ii) Which component has an average relative molecular mass of 128? Explain
(iii) State with a reason whether C is pure or impure
(iv) Explain how the mixture is separated into its components
(v) Name two naturally occurring mixtures that are separated using this process
Date posted: October 18, 2019. Answers (1)
- Give the open structures of:-
(i) 3-chlorohex-l-yne
(ii) CH3OH(Solved)
Give the open structures of:-
(i) 3-chlorohex-l-yne
(ii) CH3OH
Date posted: October 18, 2019. Answers (1)
- 10cm3 of methane (CH4) gas is exploded with 150cm3 of air containing 20% oxygen and 80% nitrogen. The products were allowed to cool to room...(Solved)
10cm3 of methane (CH4) gas is exploded with 150cm3 of air containing 20% oxygen and 80% nitrogen. The products were allowed to cool to room temperature. What will be the total volume of the gases at the end of the reaction?
Date posted: October 17, 2019. Answers (1)
- Polymerisation of ethene takes place as shown in the equation below(Solved)
Polymerisation of ethene takes place as shown in the equation below:
Name the type of polymerisation undergone by ethene in the reaction above
Date posted: October 17, 2019. Answers (1)
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Date posted: October 17, 2019. Answers (1)
- In a reaction an alcohol K was converted to hex-1-ene
Name reagent and condition necessary for the reaction above to occur(Solved)
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Name reagent and condition necessary for the reaction above to occur
Date posted: October 17, 2019. Answers (1)
- In petrol chemical industries, long chain alkanes are broken down in to simpler substances in a process called cracking
a) Why is cracking necessary?
b) State the...(Solved)
In petrol chemical industries, long chain alkanes are broken down in to simpler substances in a process called cracking
a) Why is cracking necessary?
b) State the two conditions required in cracking
c) Draw the structure of 1-chloro-2, 2-dimethylpropane
Date posted: October 17, 2019. Answers (1)
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But-z-ene undergoes hydrogenation according to the equation given below
CH3CH = CHCH3(g) + H2(g)----->CH3CH2CH2CH3(g)
Name the product formed when but-z-ene reacts with hydrogen gas
Date posted: October 17, 2019. Answers (1)
- Use the flow chart below to answer the questions that follow:(Solved)
Use the flow chart below to answer the questions that follow:
(a) What observation would be made in process K?
(b) Name another conditions necessary for process J to take place
(c) Give the name of substance V
Date posted: October 17, 2019. Answers (1)
- During welding of cracked railway lines by thermite 12.0g of oxide of iron is reduced by aluminium to 8.40g of iron. Determine the empirical formula...(Solved)
During welding of cracked railway lines by thermite 12.0g of oxide of iron is reduced by aluminium to 8.40g of iron. Determine the empirical formula of the oxide(Fe= 56.0, O= 16.0)
Date posted: October 17, 2019. Answers (1)
- 1.6g of magnesium metal is reacted with excess hydrochloric acid. Calculate the volume
of hydrogen gas produced (Molar gas volume at stp = 22.4dm3 Mg=24)(Solved)
1.6g of magnesium metal is reacted with excess hydrochloric acid. Calculate the volume
of hydrogen gas produced (Molar gas volume at stp = 22.4dm3 Mg=24)
Date posted: October 17, 2019. Answers (1)
- 10.08g of ethanedioic acid (H2C2O4.xH2O) crystals were dissolved in water and made to 1dm3 solution. 25.0cm3 of this solution was completely neutralized by 20cm3 of...(Solved)
10.08g of ethanedioic acid (H2C2O4.xH2O) crystals were dissolved in water and made to 1dm3 solution. 25.0cm3 of this solution was completely neutralized by 20cm3 of 0.2M
sodium hydroxide solution.
Calculate
i) Molarity of the acid
ii)the value of x in H2C2O4xH2O acid
Date posted: October 17, 2019. Answers (1)
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Campers GAZ cylinder contains about 1.12dm3 of butane measured at 0o and 1atm. Given that 25% of heat is lost, what is the maximum volume of water at room temperature which can be boiled to 100oC in order to make some coffee?
Date posted: October 17, 2019. Answers (1)
- An organic compound P contains 68.9% carbon, 13.5% hydrogen and 21.6% oxygen.
The relative formula mass of p is 74. Determine its molecular formula. [C=12, H=1,...(Solved)
An organic compound P contains 68.9% carbon, 13.5% hydrogen and 21.6% oxygen.
The relative formula mass of p is 74. Determine its molecular formula. [C=12, H=1, 0=16]
Date posted: October 17, 2019. Answers (1)
- In a reaction 20cm3 of 0.1 M Sodium Carbonate completely reacted with 13cm3 of dilute sulphuric acid. Find the molarity of the sulphuric acid used.(Solved)
In a reaction 20cm3 of 0.1 M Sodium Carbonate completely reacted with 13cm3 of dilute sulphuric acid. Find the molarity of the sulphuric acid used.
Date posted: October 17, 2019. Answers (1)