Biology chapter 5 enzymes: Some students compared how effective biological and non-biological washing powders are at
removing stains at temperatures between 10°C and 60°C.
• Pieces of stained cloth were washed using two different washing powders.
• The degree of stain removal was measured by using a light meter to record the
percentage of light reflected from the cloth.
• A light meter gave a value of 100% when the cloth was completely clean.
• Any stain left on the cloth reduced the percentage of light reflected.
Compare the effectiveness of the two washing powders at removing stains.
Use the information in Fig. 2.1 in your answer.

Question

Some students compared how effective biological and non-biological washing powders are at
removing stains at temperatures between 10°C and 60°C.
• Pieces of stained cloth were washed using two different washing powders.
• The degree of stain removal was measured by using a light meter to record the
percentage of light reflected from the cloth.
• A light meter gave a value of 100% when the cloth was completely clean.
• Any stain left on the cloth reduced the percentage of light reflected.
Compare the effectiveness of the two washing powders at removing stains.
 Use the information in Fig. 2.1 in your answer.

Sueanne · Accepted Answer

biological washing powder is more effective, at lower temperatures / between 10 °C and 40 °C / 10 °C and 43 °C ;
comparative data quote for the difference at a stated temperature ;
biological washing powder removes all stain between 30 °C and 40 °C ;
non-biological removes all stain only at 60 °C ;
effectiveness is similar, at high temperatures / between 50 and 60 °C ;
same trend, below 30 °C / at low temperatures / from 50 °C ;
idea of effectiveness of biological washing powder decreases between 40 °C and 44 °C, no such decrease for nonbiological washing powder ;

Biology chapter 5 enzymes

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