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-625995-727017Related topics: Matter as particles (Unit 6), A healthy body (Unit 12)0News file00Related topics: Matter as particles (Unit 6), A healthy body (Unit 12)0News file866140-228658SCIENCE00SCIENCE4485300209048Watch the video: the video: pearls, high calorie!-158759981000Drinking 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.3502660362585tapioca flourcassava00tapioca flourcassavaWhat 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.455422032258000Tapioca pearls are made by tapioca flour, brown sugar and water:In a saucepan, dissolve 40 g of brown sugar in 80 g of water. 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.45777154381500Cook the tapioca pearls in a pot of water. They will sink at first. 46259759080500The 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’? 4266565166370tapioca pearlsIced milk teaEnergy of the ingredients (%)>40%<60%Total energy: 400 kcal00tapioca pearlsIced milk teaEnergy of the ingredients (%)>40%<60%Total energy: 400 kcalTapioca 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.QuestionsS11The photo below shows a cup of iced bubble tea.tapioca pearlicemilk teatapioca pearlicemilk teaThe diagrams below show the particle models of different matters. IIIIIIWhich of the models best describe each of the ingredients of the drink?Tapioca pearlMilk teaIceAIIIIIIBIIIII590169020955000CIIIIIIDIIIIIIDirections: Questions 2 and 3 refer to step 1 on p.2.2When brown sugar is added to water, the sugar disappears and the water turns pale brown. Why?AThe water particles are used up and disappear.BThe water particles evaporate to form vapour.590804016282600CThe sugar particles mask the water particles.DThe sugar particles become evenly distributed among the water particles.3When all brown sugar is dissolved in the water, the mass of the solution isA40 g.B85 g.590804016282600C120 g. D155 g.E4In terms of gas pressure, explain how we can drink the bubble tea with a straw.(2 marks)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________5Refer 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.S36Betty drank a cup of bubble tea at lunchtime. aWhat is the major food substance found in tapioca pearls?(1 mark)________________________________________________________________________bComplete 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 systemDigestive juice(s)cWhich part of the digestive system absorbs the water in the bubble tea the most?(1 mark)________________________________________________________________________7The 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)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________8Give 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 particles1B2D3CE4When we drink bubble tea with a straw, the air pressure inside the straw is reduced.1 mThe higher atmospheric pressure outside pushes the milk tea and the tapioca pearls up the straw into our mouth.1 m5higher1 mincreases1 mdecreases1 mless dense1 mBk 3A Unit 12　A healthy body6aCarbohydrates1 mb5 mPart of the digestive systemDigestive juice(s)Mouth cavitySalivaSmall intestinePancreatic juice, intestinal juicecSmall intestine1 m7Percentage 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 m8Obesity / tooth decay / coronary heart disease / diabetes (any two) (Or other correct answers)2 mReference websites:The Consumer CouncilRisk of High Sugar Content in Tea-based Beverages – 5 Models Exceeding Maximum Daily Limit of Sugar Intake中文網頁（影片）流行茶類飲品 — 5款糖分超一日上限！ 煮熟的湯圓為什麼會浮起來？ 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. ................
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