Usually the smallest molecules are gaseous or liquid at room temperature and the large
molecules are solids. Perspex and polystyrene are solid polymers, which can be broken down
to smaller molecules by heat. Put pieces of Perspex or polystyrene in a hard glass test-tube.
Connect a delivery tube.From large molecules to small molecules A Perspex or
polystyrene B receiving tube c cold water D a liquid collects. The collecting test-tube must
be cooled thoroughly with cold water, as the fumes are harmful. Gently heat the test-tube
containing the Perspex. The polymer will melt and give off vapours, which are collected in
the receiving tube. Heating must be carefully controlled to enable all the fumes to be
condensed in the receiving tube. A liquid is obtained. This suggests that the polymer has
been broken down by heat to smaller molecules. The liquid does not return to the solid state
unless a catalyst is used. The specific catalysts are not usually available in school
laboratories.
sharon kalunda answered the question on April 12, 2019 at 09:28
- Describe an experiment to show how Ethanol is broken down to Ethene.(Solved)
Describe an experiment to show how Ethanol is broken down to Ethene.
Date posted: April 12, 2019. Answers (1)
- Discuss the Fehling's test for reducing sugars.(Solved)
Discuss the Fehling's test for reducing sugars.
Date posted: April 12, 2019. Answers (1)
- Describe an experiment to show how a catalyst affects the rate of a chemical reaction.(Solved)
Describe an experiment to show how a catalyst affects the rate of a chemical reaction.
Date posted: April 12, 2019. Answers (1)
- Describe an experiment to show how temperature affects the rate of a chemical reaction.(Solved)
Describe an experiment to show how temperature affects the rate of a chemical reaction.
Date posted: April 12, 2019. Answers (1)
- Describe an experiment to show that the rate of a reaction depends on the concentration of the react(s).(Solved)
Describe an experiment to show that the rate of a reaction depends on the concentration of the react(s).
Date posted: April 12, 2019. Answers (1)
- Describe an experiment to show that the rate of a chemical reaction depends on the size of the particle of the reactant(s).(Solved)
Describe an experiment to show that the rate of a chemical reaction depends on the size of the particle of the reactant(s).
Date posted: April 12, 2019. Answers (1)
- Describe an experiment to show that there is electrical energy produced by chemical reactions.(Solved)
Describe an experiment to show that there is electrical energy produced by chemical reactions.
Date posted: April 12, 2019. Answers (1)
- Describe an experiment that can be used to determine the heat of displacement of copper.(Solved)
Describe an experiment that can be used to determine the heat of displacement of copper.
Date posted: April 12, 2019. Answers (1)
- Describe an experiment that can be used to determine the heat of neutralization of a chemical reaction.(Solved)
Describe an experiment that can be used to determine the heat of neutralization of a chemical reaction.
Date posted: April 12, 2019. Answers (1)
- Describe an experiment which shows that some chemical reactions take in heat from the surrounding.(Solved)
Describe an experiment which shows that some chemical reactions take in heat from the surrounding.
Date posted: April 12, 2019. Answers (1)
- Give an experimental procedure to show that some chemical reactions gives out heat.(Solved)
Give an experimental procedure to show that some chemical reactions gives out heat.
Date posted: April 12, 2019. Answers (1)
- Explain how soap is made from fats.(Solved)
Explain how soap is made from fats.
Date posted: April 12, 2019. Answers (1)
- Explain how titration of acids and bases is done in the laboratory.(Solved)
Explain how titration of acids and bases is done in the laboratory.
Date posted: April 12, 2019. Answers (1)
- Describe how magnesium metal reacts with carbon dioxide.(Solved)
Describe how magnesium metal reacts with carbon dioxide.
Date posted: April 12, 2019. Answers (1)
- Explain potassium permanganate is reduced by sulphur dioxide.(Solved)
Explain potassium permanganate is reduced by sulphur dioxide.
Date posted: April 12, 2019. Answers (1)
- How is sulphur dioxide prepared in the laboratory?(Solved)
How is sulphur dioxide prepared in the laboratory?
Date posted: April 12, 2019. Answers (1)
- Describe an experiment to show how hydrogen is displaced from acids by different metals.(Solved)
Describe an experiment to show how hydrogen is displaced from acids by different metals.
Date posted: April 12, 2019. Answers (1)
- Describe how sodium reacts with water.(Solved)
Describe how sodium reacts with water.
Date posted: April 12, 2019. Answers (1)
- Describe an experiment to show how copper is displaced from aqueous solution of copper ions.(Solved)
Describe an experiment to show how copper is displaced from aqueous solution of copper ions.
Date posted: April 12, 2019. Answers (1)
- Describe the electrolysis of water.(Solved)
Describe the electrolysis of water.
Date posted: April 12, 2019. Answers (1)