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This resource comprises an essay on each of three prescribed works for A-level Spanish (7692) Paper 2. Each essay is accompanied by the relevant mark scheme extract and by a commentary to explain the marks awarded. This resource aims to exemplify to teachers the way the mark scheme is applied to students’ essays.
30 lip 2024 · Knowing what you do about the polarity of water, why do you think water dissolves sugar? Students may think that sugar is made of ionic bonds like salt. Or they might think that sugar has positive and negative areas and this is why water is attracted to it.
24 lip 2017 · The reason that sugar dissolves more quickly in hot water than in cold water has to do with the kinetic energy of the particles. The faster (hotter) the water molecules are moving, the more energy they give to the sugar molecules when they collide with them.
Dissolving sugar in water is an example of a physical change. Here's why: A chemical change produces new chemical products. In order for sugar in water to be a chemical change, something new would need to result. A chemical reaction would have to occur. However, mixing sugar and water simply produces... sugar in water!
Most solids, including sugar and salt, become more soluble with increasing temperature. This is because heat increases molecular movement, causing more collisions between the water molecules and the solid. But the opposite is true for gases, which tend to become less soluble as a solvent’s temperature increases.
1. Why does the sugar dissolve in water? 2. What happens to the sugar when it dissolves? You can also use food coloring in water to show the students how food coloring acts in hot water compared to room temperature water. Seeing the food coloring diffuse more quickly helps the students see that the temperature of
Solid sugar consists of individual sugar molecules held together by intermolecular attractive forces. When water dissolves sugar, it separates the individual sugar molecules by disrupting the attractive forces, but does not break the covalent bonds between the carbon, hydrogen, and oxygen atoms.
