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Human Effects Of Ecosystems 1.pdf

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Preview of Human effects of ecosystems 1
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📊 Size: 979 KB
👤 Author: Lakshmi
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Summary

The photograph shows packaging pellets made from thermoplastic starch, produced from corn starch, which is a sustainable resource.
(a) (i) The term "sustainable" refers to the ability to maintain or support a process without depleting natural resources, causing harm to the environment, or compromising the ability of future generations to meet their needs.
(ii) Packaging pellets made from thermoplastic starch are sustainable because they are produced from a renewable resource (corn starch), whereas polystyrene pellets are not sustainable as they are made from crude oil, a non-renewable resource.
(b) (i) The best conditions for the breakdown of the plastic were at 40 °C and pH 7.5, as shown by the highest percentage decrease in mass.
(ii) The effect of temperature on the breakdown of the plastic is that a higher temperature (40 °C) results in a greater percentage decrease in mass, indicating faster breakdown, compared to a lower temperature (30 °C).

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Description

The photograph shows packaging pellets made from thermoplastic starch, produced from corn starch, which is a sustainable resource.

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  • File Format: PDF
  • File Size: 979 KB
  • Pages: 14
  • Language: EN
  • Author: Lakshmi
  • Total Downloads: 153
  • Last Updated: 2 weeks ago

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