Sugary drinks 0 Overview Using this Resource Connecting to the Curriculum Marking Student Responses Working with Students Further Resources This task is about what happens when you add sugar to water. Question Manaia's father liked sweet tea. He stirred three heaped teaspoons of sugar into a cup that was almost overflowing. He was surprised that adding the sugar didn't make the tea spill over into the saucer. What happened to the sugar? The hot tea caused it to evaporate. It settled on the bottom of the cup. It melted and became liquid. It dissolved in the hot liquid. Question Manaia was mixing a fruit cordial drink in a large glass which was three-quarters full of water. He was adding spoonfuls of sugar and stirring it in. If he kept adding sugar and kept stirring the mixture, what would happen eventually? The sugar would continue to dissolve, but Manaia's drink would be very sweet. The mixture would slowly thicken and become a syrup. All the sugar would dissolve, but the volume of the drink would increase. No more sugar would dissolve and it would collect at the bottom of the glass. Task administration: This task can be completed with pencil and paper or online with auto-marking. Levels: 3, 4 Curriculum info: Science, Knowledge, Material World Keywords: changes, solubility, dissolving, saturated solution Description of task: The resource consists of two multiple-choice questions about solubility and saturated solutions. Answers/responses: Y8 (09/1998) a) D [It dissolved in the hot liquid] easy b) D [No more sugar would dissolve and it would collect at the bottom of the glass] difficult Diagnostic and formative information: Common Error b) Option A chosen by 36% of students. Dissolving sugar II Melting or dissolving? Dissolving salt faster Which type of sugar dissolves best? What is happening? Dissolving milo Sugar and water Rates of dissolving Dissolving sugar Melting and dissolving Why "dissolving" is a difficult idea
