When sugar is added to water and the sugar is completely dissolved by the water the resulting substance is called a?

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It is important to know the meaning of a whole range of words in many scientific situations. Without this knowledge it makes the reading and understanding of information, and communicating it to other people very difficult!

There are many kinds of mixtures, but they all contain more than one substance. The following tasks will enable you to learn and use a variety of words to do with solutions and the separation of solid and liquid mixtures.

Task 1: Liquids and solutions

1. Open Yenka file Model 1 and add the solid to the beaker of water in each experiment.
2. A mixture in which a substance has fully dissolved in water is called a solution and the substance is said to be soluble. An example of this type of mixture is sugar in water. Here the sugar dissolves fully to give a clear solution. In this example, sugar is the solute and water is the solvent.
   A mixture in which a substance does not dissolve in water is called a suspension and the substance is said to be insoluble. An example of this type of mixture is chalk in water. Chalk is insoluble - it does not dissolve in water.
3. From the list of 11 words choose which completes the sentences (a) to (i) . Each word is only used once.
   WORD LIST: insoluble, mixture, suspension, pure, soluble, solvent, dissolve, solute, saturated, solution. (a) A _____________ is a liquid that dissolves materials. (b) A _______________ is formed when a finely powdered solid that does not dissolve is spread around in the liquid (e.g. muddy water). (c) When a solid dissolves in a liquid a ____________ is formed. (d) When a solid will not dissolve in a liquid it is referred to as _____________. (e) If a material is _________, it only contains one substance and no other. (f) The solid that dissolves in a liquid is called the __________. (g) Any ____________, gas, liquid or solid, contains at least two substances that are not chemically combined and are, therefore, easily separated. (h) If a substance is ______________, it will dissolve in a liquid.

   (i) When no more solid will ___________ in a liquid, the resulting solution is said to be ____________.

   Answer

   (a) solvent (b) suspension (c) solution (d) insoluble (e) pure (f) solute (g) mixture (h) soluble

   (i) dissolve and saturated

Task 2: Separation of mixtures

1. Open Yenka file Model 2.
2. The beaker holds a mixture of sand and water. You can separate a mixture like this using filtration, because the sand is insoluble. The flask contains a funnel and filter paper. Filter paper will only allow liquids and solutions to pass through it, so it can be used to separate the mixture. Add the mixture of sand and water to the filter paper by rotating the beaker and let the water drain through. What do you observe?
3. Which of the following mixtures could be separated by filtration? (a) salt and sand (b) salt and water

   (c) water and chalk

4. From the list choose the word or phrase that completes the descriptions of methods of separating mixtures (a) to (h). Each word or phrase is only used once.
   WORD LIST: chromatography, fractional distillation, magnet, filtrate, crystallisation, separating funnel, evaporation, simple distillation, filtration. (a) The process of heating a solution to drive off a liquid to leave a solid without collecting the liquid is called ___________. (b) Using ___________ is a way of separating an insoluble solid from a liquid. (c) The _____________ is the liquid that passes through a filter paper when separating an insoluble solid from a liquid. (d) The method of separating different coloured substances because of their different solubilities in a solvent is called ____________. (e) The method of separating and collecting a solvent from a solution using a condenser is called _________ (f) The slow process of solid formation from a solution as the liquid solvent is removed is called ____________. (g) A __________ can be used to separate the solids iron and sulfur. (h) The process of _____________ involves boiling and condensation to separate at least two liquids dissolved in each other (miscible liquids).

   (i) ________________ can be used to separate two liquids that do not mix (immiscible liquids).

   Answer

   (a) Evaporation (b) Filtration (c) Filtrate (d) Separating funnel (e) Simple distillation (f) Crystallisation (g) Magnet (h) Fractional distillation

   (i) Chromatography

   Teacher Summary

   • This lesson is designed to teach the vocabulary of mixtures, and does not cover the topic as a whole.

Is dissolving sugar in water an example of a chemical or physical change? This process is a little trickier to understand than most, but if you look at the definition of chemical and physical changes, you'll see how it works. Here are the answer and an explanation of the process.

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! The substances may change form, but not identity. That's a physical change.

One way to identify some physical changes (not all) is to ask whether the starting materials or reactants have the same chemical identity as the ending materials or products. If you evaporate the water from a sugar-water solution, you're left with sugar.

Any time you dissolve a covalent compound like sugar, you're looking at a physical change. The molecules get further apart in the solvent, but they don't change.

However, there's a dispute about whether dissolving an ionic compound (like salt) is a chemical or physical change because a chemical reaction does occur, where the salt breaks into its component ions (sodium and chloride) in water. The ions display different properties from the original compound. That indicates a chemical change. On the other hand, if you evaporate the water, you're left with salt. That seems consistent with a physical change. There are valid arguments for both answers, so if you're ever asked about it on a test, be prepared to explain yourself.

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What happens when you add sugar to water? Q&A