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(a) Step I-Dehydration
Step II-Additional reaction
(b) Ethene has high Carbon Hydrogen ratio// Ethene is unsaturated
maurice.mutuku answered the question on September 19, 2019 at 08:41
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The diagram below shows the heating curve of a pure substance. Study it and answer the questions that follow.
(a) What are the physical states of the substances at points W and Y.
(b) Explain why the temperature remains constant between points B and C.
Date posted: September 19, 2019. Answers (1)
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Date posted: September 19, 2019. Answers (1)
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When a grey powder P, which has no action on cold water is placed into a salt solution of Q, a brown solid R is deposited.
The blue solution of Q, fades giving way to a green solution.
a) Name the type of reaction that takes place.
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c) Write an equation for the reaction leading to formation of the brown solid.
Date posted: September 19, 2019. Answers (1)
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A student dissolved some ammonium nitrate salt in water in a glass beaker. The solution formed felt very cold.
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Date posted: September 19, 2019. Answers (1)
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Use the bond energies in the table below to calculate the enthalpy for the above reaction.
Date posted: September 19, 2019. Answers (1)
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b) State and explain the observation made after 20 minutes.
Date posted: September 19, 2019. Answers (1)
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Date posted: September 19, 2019. Answers (1)
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The diagram below shows the set-up that can be used to prepare and collect oxygen gas. Study it and answer the questions that follow.
Identify two mistakes from the diagram which must be corrected for one to collect dry oxygen gas.
Date posted: September 19, 2019. Answers (1)
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(i) Nitrogen and hydrogen.
(ii) Nitrogen and water.
(iii) Nitrogen (II) oxide and water.(Solved)
State the conditions under which ammonia gives the following products when heated
(i) Nitrogen and hydrogen.
(ii) Nitrogen and water.
(iii) Nitrogen (II) oxide and water.
Date posted: September 19, 2019. Answers (1)
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Date posted: September 19, 2019. Answers (1)
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Using electrons in the outermost energy level, draw a dot (.) and cross (X) diagram for the ion of 
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Date posted: September 19, 2019. Answers (1)
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Date posted: September 19, 2019. Answers (1)
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Study the energy level diagram for the reaction shown below and use it to answer the questions that follow.
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(i) State and explain two ways of increasing the yield of SO3 per unit time from the diagram.
(ii) What do the following represent?
Date posted: September 19, 2019. Answers (1)
- When Iron (III) chloride is exposed to the atmosphere, it forms a solution.
(a) Name the process that takes place.
(b) State one use of the...(Solved)
When Iron (III) chloride is exposed to the atmosphere, it forms a solution.
(a) Name the process that takes place.
(b) State one use of the process named in (a) above.
Date posted: September 19, 2019. Answers (1)
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The following diagram was used to study a property of hydrogen gas. Study it and answer the questions that follow.
a) Name the missing condition in the above set up.
b) Explain why the combustion tube is clamped in a slanting position.
c) Before lighting the gas at the end of delivery tube, hydrogen must be let to pass through until all the air is driven out. Explain.
d) State three observations that occur in the combustion tube.
e) Why was hydrogen gas burnt at point Z.
f) Why should the supply of hydrogen gas be continued while the apparatus cool.
g) What would be observed if the experiment was repeated using lead (II) oxide.
h) Other than the property investigated above, name two other chemical properties of hydrogen gas.
Date posted: September 19, 2019. Answers (1)
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Find the mass of 5.2 x 1025 atoms of sodium. (Na = 23.0, L = 6.023 x 103)
Date posted: September 19, 2019. Answers (1)
- 0.239g of copper (II) oxide was placed in a conical flask. Calculate the volume of 0.1 M solution of hydrochloric acid that would completely react...(Solved)
0.239g of copper (II) oxide was placed in a conical flask. Calculate the volume of 0.1 M solution of hydrochloric acid that would completely react with copper (II) oxide in the conical flask.
(0= 16.0, Cu = 63.5, H= 1.0, Cl = 35.5)
Date posted: September 19, 2019. Answers (1)
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Calculate the mass of sodium carbonate contained in 200cm3 of 0.02M sodium carbonate solution.
Date posted: September 19, 2019. Answers (1)
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Date posted: September 19, 2019. Answers (1)
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Date posted: September 19, 2019. Answers (1)