Get premium membership and access questions with answers, video lessons as well as revision papers.
When a solid is heated, the particles vibrate more strongly as they gain kinetic energy and the particle attractive forces are weakened. Eventually, at the melting point, the attractive forces are too weak to hold the particles in the structure together in an ordered way and so the solid melts. The particles become free to move around and lose their ordered arrangement. Energy is needed to overcome the attractive forces and give the particles increased kinetic energy of vibration. On heating further, the particles gain more kinetic energy and move faster. In evaporation and boiling the particles with the highest kinetic energy can ‘escape’ from the attractive forces of the other liquid particles. The particles lose any order and become completely free to form a gas or vapour. Boiling is rapid evaporation anywhere in the bulk liquid and at a fixed temperature called the boiling point and requires continuous addition of heat.
Vicky001 answered the question on September 24, 2017 at 20:01
- Explain the Kinetic Particle Theory(Solved)
Explain the Kinetic Particle Theory
Date posted: September 24, 2017. Answers (1)
- State the uses of water in frasch process(Solved)
State uses of water in frasch process
Date posted: September 24, 2017. Answers (1)
- Why is a glass container for sampling and storage inappropriate(Solved)
Why is a glass container for sampling and storage inappropriate
Date posted: September 20, 2017.
- State two chemical tests for the presence of water(Solved)
State two chemical tests for the presence of water
Date posted: September 19, 2017. Answers (1)
- What is oxidation agent?(Solved)
What is oxidation agent?
Date posted: September 19, 2017. Answers (1)
- What is oxidation?(Solved)
What is oxidation?
Date posted: September 19, 2017. Answers (1)
- State two applications of radioactivity in medicine.(Solved)
State two applications of radioactivity in medicine.
Date posted: September 19, 2017. Answers (1)
- Explain why calcium Oxide is not used to dry hydrogen chloride gas.(Solved)
Explain why calcium Oxide is not used to dry hydrogen chloride gas.
Date posted: September 19, 2017. Answers (1)
- Sulphur is extracted from underground deposits by frasch process. State two physical properties of Sulphur that makes it possible to be extracted through this process.(Solved)
Sulphur is extracted from underground deposits by frasch process. State two physical properties of Sulphur that makes it possible to be extracted through this process.
Date posted: September 19, 2017. Answers (1)
- Name a suitable drying agent for hydrogen chloride gas(Solved)
Name a suitable drying agent for hydrogen chloride gas
Date posted: September 19, 2017. Answers (1)
- Explain why iodine is a bad conductor of heat and electricity(Solved)
Explain why iodine is a bad conductor of heat and electricity
Date posted: September 19, 2017. Answers (1)
- Define the term esterification(Solved)
Define the term esterification
Date posted: September 19, 2017. Answers (1)
- What is the meaning of half life of a substance?(Solved)
What is the meaning of half life of a substance?
Date posted: September 19, 2017. Answers (1)
- Explain how alkaline solution is useful on acidic soil(Solved)
Explain how alkaline solution is useful on acidic soil
Date posted: September 18, 2017. Answers (1)
- Iron is extracted from its ore by the blast furnace process
a) Name chief ore from which iron is extracted from.
b) An ore is suspected to...(Solved)
Iron is extracted from its ore by the blast furnace process
a) Name chief ore from which iron is extracted from.
b) An ore is suspected to contain mainly iron. Describe a method that can be used to confirm the presence of iron in the ore
Date posted: September 18, 2017. Answers (1)
- Explain why hard water flowing in lead pipes may be safer for drinking than soft water
flowing in the same pipes.(Solved)
Explain why hard water flowing in lead pipes may be safer for drinking than soft water
flowing in the same pipes.
Date posted: September 18, 2017. Answers (1)
- In terms of structure and bonding. Explain why water (H2O) is a liquid at room temperature while Hydrogen sulphide (H2S) is a gas.(Solved)
In terms of structure and bonding. Explain why water (H2O) is a liquid at room temperature while Hydrogen sulphide (H2S) is a gas.
Date posted: September 18, 2017. Answers (1)
- In an experiment to determine the solubility in water at 300c, the following results were obtained.
Mass of empty evaporating dish = 26.2g
Mass of evaporating dish...(Solved)
In an experiment to determine the solubility in water at 300c, the following results were obtained.
Mass of empty evaporating dish = 26.2g
Mass of evaporating dish + saturated solution = 42.4g.
Mass of evaporating dish + dry solid Y = 30.4g
Use this data to calculate the solubility of Y at 300C.
Date posted: September 18, 2017. Answers (1)
- Define solubility(Solved)
Define solubility
Date posted: September 18, 2017. Answers (1)
- a) State and explain the observations made when chlorine water is exposed to light after 24 hours. (b)State one use of chlorine gas(Solved)
a) State and explain the observations made when chlorine water is exposed to light after 24 hours.
b)State one use of chlorine gas
Date posted: September 18, 2017. Answers (1)