Get premium membership and access questions with answers, video lessons as well as revision papers.
It is blue in colour
- It has three zones (almost
colourless zone, green blue
zone, pale blue zone)v
- Gives only a little light
because it contains fewer hot
carbon particles.v(Any correct
2 marks)
alexis sadro answered the question on October 8, 2017 at 18:09
- Sodium is highly electropositive,hence it can only be isolated by electrolysis(a)Name the major ore from which sodium is extracted(b)why should ore be in molten...(Solved)
Sodium is highly electropositive,hence it can only be isolated by electrolysis
(a)Name the major ore from which sodium is extracted
(b)why should ore be in molten form before electrolysis
(c)Give the detrimental effect on the enviroment that may result from the extraction of sodium
Date posted: October 6, 2017. Answers (1)
- Sodium is highly electropositive,hence it can only be isolated by electrolysis(a)Name the major ore from which sodium is extracted(b)why should ore be in molten...(Solved)
Sodium is highly electropositive,hence it can only be isolated by electrolysis
(a)Name the major ore from which sodium is extracted
(b)why should ore be in molten form before electrolysis
(c)Give the detrimental effect on the environment that may result from the extraction of sodium
Date posted: October 6, 2017. Answers (1)
- (a)Patients with heart burn are advised to take milk of magnesia.Explain(b)Write an ionic equation between (ii)hydroxide and dillute sulphuric (vi)acid(Solved)
(a)Patients with heart burn are advised to take milk of magnesia.Explain
(b)Write an ionic equation between (ii)hydroxide and dillute sulphuric (vi)acid
Date posted: October 6, 2017. Answers (1)
- Propanol and butanol are third and fourth members respectively of the same homologous series.State and explain how their boiling point compare(Solved)
Propanol and butanol are third and fourth members respectively of the same homologous series.State and explain how their boiling point compare
Date posted: October 6, 2017. Answers (1)
- You are provided with the following :copper turning,dilute sulphuric acid and a source of heat. Describe fully how you would prepare copper (ii) sulphate crystals(Solved)
You are provided with the following :copper turning,dilute sulphuric acid and a source of heat. Describe fully how you would prepare copper (ii) sulphate crystals
Date posted: October 6, 2017. Answers (1)
- (a)Phosphorus has melting point of 40o and 590o.Explain
(B)Why is phosphorus stored under water ...(Solved)
(a)Phosphorus has melting point of 40o and 590o.Explain
(B)Why is phosphorus stored under water
Date posted: October 6, 2017. Answers (1)
- When lead nitrate and sodium sulphate react, a white precipitate is formed. (i)Identify the white precipitate.(ii) Write an ionic equation of the reaction(Solved)
When lead nitrate and sodium sulphate react, a white precipitate is formed. (i)Identify the white precipitate.(ii) Write an ionic equation of the reaction
Date posted: October 5, 2017. Answers (1)
- Starting with copper metal, describe how you can prepare solid copper (ii) carbonate(Solved)
Starting with copper metal, describe how you can prepare solid copper (ii) carbonate
Date posted: October 5, 2017. Answers (1)
- What observation will be made when a few drops of concentrated sulphuric (VI) acid are added to crystals of sugar? Explain your answer (Solved)
What observation will be made when a few drops of concentrated sulphuric (VI) acid are added to crystals of sugar? Explain your answer
Date posted: October 4, 2017. Answers (1)
- Explain one way in which sulphur (IV) oxide is a pollutant(Solved)
Explain one way in which sulphur (IV) oxide is a pollutant
Date posted: October 4, 2017. Answers (1)
- The molar enthalpy of neutralisation between hydrochloric acid and ammonia solution was found to be -52.2 kj mol4, while that of hydrochloric acid and...(Solved)
The molar enthalpy of neutralisation between hydrochloric acid and ammonia solution was found to be -52.2 kj mol4, while that of hydrochloric acid and sodium hydroxide was 57.1 kJ mol-1. Explain the difference in these values.
Date posted: October 4, 2017. Answers (1)
- What is meant by the term 'Enthalpy of formation'? (Solved)
What is meant by the term 'Enthalpy of formation'?
Date posted: October 4, 2017. Answers (1)
- Element M reacts with water at room temperature to produce 0.2 dm3 of gas. Determine the mass of M which was...(Solved)
Element M reacts with water at room temperature to produce 0.2 dm3 of gas. Determine the mass of M which was reacted with water. (Molar gas volume at room temperature is 24 dm3, Relative atomic mass of M = 7).
Date posted: October 4, 2017. Answers (1)
- A solution was made by dissolving 8.2g of calcium nitrate to give 2 litres of solution. (Ca = 40.0; N = 14.0;...(Solved)
A solution was made by dissolving 8.2g of calcium nitrate to give 2 litres of solution. (Ca = 40.0; N = 14.0; O = 16.0).
Determine the concentration of nitrate ions in moles per litre
Date posted: October 4, 2017. Answers (1)
- When 15cm3 of a gaseous hydrocarbon, P, was burnt in 100cm3 of oxygen, the resulting gaseous mixture occupied 70cm3 at room temperature and pressure....(Solved)
When 15cm^3 of a gaseous hydrocarbon, P, was burnt in 100cm^3 of oxygen, the resulting gaseous mixture occupied 70cm^3 at room temperature and pressure. When the gaseous mixture was passed through potassium hydroxide solution, its volume decreased to 25cm^3.
(a) What volume of oxygen was used during the reaction?
Date posted: October 4, 2017. Answers (1)
- Name one alloy of copper and state its use.
Alloy
Use(Solved)
Name one alloy of copper and state its use.
Alloy
Use
Date posted: October 4, 2017. Answers (1)
- Name two ores from which copper is extracted(Solved)
Name two ores from which copper is extracted
Date posted: October 4, 2017. Answers (1)
- A certain mass of gas occupies 146 dm^3 at 291 K and 98.31 kPa. What will be...(Solved)
A certain mass of gas occupies 146 dm^3 at 291 K and 98.31 kPa. What will be its temperature if its volume is reduced to 133 dm^3 at 101.325 kPa?
Date posted: October 4, 2017. Answers (1)
- A gas jar full gas V was opened in air. Explain the observation made by use of an equation.(Solved)
A gas jar full gas V was opened in air. Explain the observation made by use of an equation.
Date posted: October 3, 2017. Answers (1)
- what is evaporation?(Solved)
paper two.
Date posted: October 2, 2017. Answers (1)