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tapioca flour

cassava

Small pearls, high calorie!

Drinking bubble tea has become a new trend among teenagers. However, a research found that the sugar contents and energy levels of bubble tea could be dangerously high. Let’s take a look into this delicious treat and find out how to drink healthier.

What is bubble tea?

Bubble tea is usually made by mixing tapioca pearls with milk tea. Tapioca is a starch

extracted from a plant called cassava (木薯).

The drink is usually served with a wide straw so that we can suck up the milk tea together with the tapioca pearls sitting at the bottom.

Oxford University Press 2019 - 1 - New Mastering Science

News file

Related topics: Matter as particles (Unit 6), A healthy body (Unit 12)0

SCIENCE

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tapioca pearls

Iced milk tea

Energy of the ingredients (%)

>40%

<60%

Total energy: 400 kcal

Tapioca pearls are made by tapioca flour, brown sugar and water:

1 In a saucepan, dissolve 40 g of brown sugar in 80 g of water.

2 Boil the solution in step 1. Once it boils, turn off the heat. Add 115 g of tapioca flour into the saucepan. Stir well. Knead the ingredients into small tapioca pearls.

3 Cook the tapioca pearls in a pot of water. They will sink at first.

4 The pearls will gradually float to the top. Take out the pearls and stir them with 35 g of the brown sugar. That’s it!

Bubble tea, a ‘calorie bomb’?

Tapioca pearls is an important source of sugar and energy in bubble tea.

The research found that the average energy level of a cup of bubble tea could reach 400 kcal. This is equal to the energy provided by two regular bowls of rice. The tapioca pearls contributed over 40% (170 kcal) of the total energy.

To reduce the threat of this ‘calorie bomb’, bubble tea lovers are advised to request fewer pearls or choose a smaller serving size of the drink.


tapioca pearl

ice

milk tea

QuestionsS11 The photo below shows a cup of iced bubble tea.

The diagrams below show the particle models of different matters.

I II IIIWhich of the models best describe each of the ingredients of the drink?

Tapioca pearl Milk tea IceA I II IIIB I III IC III II ID III I II

Directions: Questions 2 and 3 refer to step 1 on p.2.2 When brown sugar is added to water, the sugar disappears and the water turns pale brown. Why?

A The water particles are used up and disappear.B The water particles evaporate to form vapour.C The sugar particles mask the water particles.D The sugar particles become evenly distributed among the water particles.

3 When all brown sugar is dissolved in the water, the mass of the solution isA 40 g.B 85 g.


C 120 g. D 155 g.

E4 In terms of gas pressure, explain how we can drink the bubble tea with a straw.(2 marks)

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

5 Refer to step 3 and 4 on p.2, explain why tapioca pearls sink in the water first and float later.(4 marks)

At the beginning, the density of the tapioca pearls is ___________________ than that of the

water. Therefore they sink.

When the tapioca pearls are heated, the volume of the pearls ___________________ and hence

their density ___________________. When the pearls become ___________________ than the

water, they float.


S36 Betty drank a cup of bubble tea at lunchtime.

a What is the major food substance found in tapioca pearls? (1 mark)

________________________________________________________________________

b Complete the table below to show the parts of the digestive system and the corresponding digestive juices that are involved in the digestion of the food substance in a. (5 marks)

Part of the digestive system Digestive juice(s)

c Which part of the digestive system absorbs the water in the bubble tea the most? (1 mark)

________________________________________________________________________


7 The daily energy requirement for Betty is 7560 kJ. Assumed that she has 3 meals a day and the amount of energy she takes from each meal is the same. Determine one cup of bubble tea will take up how much percentage of her daily energy requirement from one meal. Show your calculation. (3 marks)

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

8 Give TWO diseases Betty may get if she drinks too much bubble tea for a long time. (2 marks)

____________________________________________________________________________

____________________________________________________________________________


Suggested answersBk 1B Unit 6　Matter as particles

1 B

2 D

3 C

E4 When we drink bubble tea with a straw, the air pressure inside the straw is reduced. 1 m

The higher atmospheric pressure outside pushes the milk tea and the tapioca pearls up the straw into our mouth. 1 m

5 higher 1 mincreases 1 mdecreases 1 mless dense 1 m

Bk 3A Unit 12　A healthy body6 a Carbohydrates 1 m

b 5 m

Part of the digestive system Digestive juice(s)

Mouth cavity Saliva

Small intestine Pancreatic juice, intestinal juice

c Small intestine 1 m

7 Percentage of Betty’s daily energy requirement from one meal taken by a whole cup of bubble tea

= 400 × 4.27560 ÷ 3

× 100% 2 m

= 67 % 1 m


8 Obesity / tooth decay / coronary heart disease / diabetes (any two) (Or other correct answers)2 m

Reference websites:

The Consumer Council

Risk of High Sugar Content in Tea-based Beverages – 5 Models Exceeding Maximum Daily Limit of Sugar Intakehttp://eresources.oupchina.com.hk/nmasci/links/news12.html

中文網頁

（影片）流行茶類飲品 — 5 款糖分超一日上限！ http://eresources.oupchina.com.hk/nmasci/links/news11.html

煮熟的湯圓為什麼會浮起來？http://eresources.oupchina.com.hk/nmasci/links/news13.html

To distribute the worksheet via Google Form (For teachers only)

Access the URL below to copy the form to your own Google account.

Then send the Google Form to your students.

https://docs.google.com/forms/d/1s2Ja1nbZlRyG5EGTzWJ6tUuNuDT_h4P7BhCLMMUOODc/copy




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