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1. Sealing of roofs
2. Manufacture of tar used in tarmac
johnmulu answered the question on February 3, 2017 at 12:31
- What condition could cause a poisonous gas to be formed when kerosene is burnt?(Solved)
What condition could cause a poisonous gas to be formed when kerosene is burnt? Explain
Date posted: February 3, 2017. Answers (1)
- Describe how solid sample of potassium sulphate can be prepared starting with 200 cm3 of 2M potassium hydroxide(Solved)
Describe how solid sample of potassium sulphate can be prepared starting with 200 cm3 of 2M potassium hydroxide.
Date posted: February 3, 2017. Answers (1)
- State the Gay Lussac’s Law(Solved)
Start the Gay Lussac’s Law.
Date posted: February 3, 2017. Answers (1)
- Describe how a sample of pure sodium sulphate crystals can be prepared (Solved)
Starting with 50 cm 3 of 2.8 M sodium hydroxide, describe how a sample of pure sodium sulphate crystals can be prepared.
Date posted: February 3, 2017. Answers (1)
- State why it is not advisable to wash vehicles using sea water(Solved)
State why it is not advisable to wash vehicles using sea water.
Date posted: February 3, 2017. Answers (1)
- State the Boyle's law(Solved)
State the Boyle's law.
Date posted: February 3, 2017. Answers (1)
- State the Graham’s law of diffusion(Solved)
State the Graham’s law of diffusion.
Date posted: February 3, 2017. Answers (1)
- A small crystal of potassium manganate (VII) was placed in a beaker containing water. The beaker was left standing for two days without shaking.(Solved)
A small crystal of potassium manganate (VII) was placed in a beaker containing water. The beaker was left standing for two days without shaking. State and explain the observation that were made
Date posted: February 3, 2017. Answers (1)
- State the Charles’ law(Solved)
State the Charles’ law.
Date posted: February 3, 2017. Answers (1)
- A few crystals of crystals of potassium manganite (VII) were carefully placed into water in a beaker at one spot(Solved)
A few crystals of crystals of potassium manganite (VII) were carefully placed into water in a beaker at one spot. The beaker was left undisturbed for two hours. State and explain the observations.
Date posted: February 3, 2017. Answers (1)
- In an experiment, ammonium chloride was heated in a test-tube. A moist red litmus paper placed at the mouth of the test tube(Solved)
In an experiment, ammonium chloride was heated in a test-tube. A moist red litmus paper placed at the mouth of the test tube first changed blue then red. Explain these observations
Date posted: February 3, 2017. Answers (1)
- Charcoal is a fuel that is commonly used for cooking. When it burns it forms two oxides(Solved)
Charcoal is a fuel that is commonly used for cooking. When it burns it forms two oxides
a) Name the two oxides
b) State one use of the two oxide
Date posted: February 3, 2017. Answers (1)
- What is the role of carbon (IV) oxide in fire extinguishing?(Solved)
What is the role of carbon (IV) oxide in fire extinguishing?
Date posted: February 3, 2017. Answers (1)
- Describe how carbon (IV) oxide can be distinguished from carbon (II) oxide using calcium hydroxide solution(Solved)
Describe how carbon (IV) oxide can be distinguished from carbon (II) oxide using calcium hydroxide solution
Date posted: February 3, 2017. Answers (1)
- Diamond and graphite are allotropes of carbon. What is meant by an allotrope (Solved)
a) Diamond and graphite are allotropes of carbon. What is meant by an allotrope
b) Explain why graphite can be used as a lubricant while diamond cannot
Date posted: February 3, 2017. Answers (1)
- Graphite is one of the allotropes of carbon (a) Name one other element which exhibits allotropy(Solved)
Graphite is one of the allotropes of carbon
a) Name one other element which exhibits allotropy
b) Explain why graphite is used in the making of pencil leads
Date posted: February 3, 2017. Answers (1)
- State and explain one chemical property that makes carbon (II) oxide poisonous to human beings(Solved)
State and explain one chemical property that makes carbon (II) oxide poisonous to human beings.
Date posted: February 3, 2017. Answers (1)
- Carbon (II) oxide is describe as “a silent killer”.
(a) State one physical property of carbon (II) oxide that makes it “a silent killer”
(b) Write...(Solved)
Carbon (II) oxide is describe as “a silent killer”.
(a) State one physical property of carbon (II) oxide that makes it “a silent killer”.
(b) Write the formula of the oxide of carbon which is "silent killer".
Date posted: February 3, 2017. Answers (1)
- In terms of structure and bonding, explain why graphite is used as a lubricant(Solved)
In terms of structure and bonding, explain why graphite is used as a lubricant.
Date posted: February 3, 2017. Answers (1)
- Explain why diamond is hard while graphite is soft(Solved)
Both diamond and graphite have giant atomic structures. Explain why diamond is hard while graphite is soft
Date posted: February 3, 2017. Answers (1)