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to ensure that the test tubes would be filled with the same amount of milk

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spotting the clots formed and ensuring that equal amount of rennin is added in the test tubes

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to ensure that all the temperatures of the test tubes are the same

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to ensure that the amount of milk placed in each test tube is accurate

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to ensure an accurate amount of milk is added

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to check every one minute because by the time we analysed the test tube, the minute was already up

to ensure that the amount added solution ( like the distilled water ) was accurate

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to ensure that each test tube has equal amount of milk

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To ensure that the volume of milk is accurate and precise

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To ensure the amount of substances used is equal for all the tubes

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to ensure that it is accurate for each test tube

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Ensuring all the tubes are put in and taken out at the correct time

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jiayu

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Drawing the table and finding for clots

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to keep track of time and to make sure there is the same amount of renin and milk in each test tube

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- to identify the clots in all the test tubes
- to keep track of time

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so that the temperature of all 3 test tubes would be constant

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To ensure that an accurate and precise amount of milk added is the same for all test tubes, and that no milk drips out and everything goes inside

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Keeping the time accurate to 1 minute and ensuring that the results I saw were as accurate as possible

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Lea & Jie Hong

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To make the temperature of all three test tubes the same which enable a more accurate result.

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To ensure the volumes of milk are accurate and precise to carry on the experiment.

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1. To determine whether the milk has start clotting as you might mistaken the bubbles of milk as the clotted milk.
2. To fill in the table and at the same time to keep track of the time.

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readings would be more accurate and the volume of all the 3 test tubes would be constant

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1. keeping track of time
2. ensuring the amount of milk and rennin is the same for all 3 test tubes

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to be able to check the test tubes within the minute before checking them again after another minute

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Jyun Wah and Gregory

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Grace

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Grace

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milk rennin experiment

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so that the temperature will be the same for the test tubes

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To ensure precision and make sure that all test tubes have the same volume of milk and rennin

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To make the table headings and to keep track of the time

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to make it more precise in terms of the volume of milk and make sure that it is the same for all the tubes

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Drawing table
Keeping track of time

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To ensure accuracy of volume of milk

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To let the enzymes become the optimum temperature. So that the experiment would be accurate.

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So that it is more accurate.

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Why do we put the test tubes in a water bath for a period of time?

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Why do we put the test tubes in a water bath for a period of time?

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Write down 2 difficulties you face when carrying out this practical.  

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Write down 2 difficulties you face when carrying out this practical.  

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Photographs of your setup today to help you recall the practical

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Photographs of your setup today to help you recall the practical

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Why do we use a syringe to add the 5cm3 of milk?

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Why do we use a syringe to add the 5cm3 of milk?