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Presentation transcript:

Solutions:

(D) Identify changes that can 5.5 The student knows that matter has measurable physical properties and those properties determine how matter is classified, changed and used. (D) Identify changes that can occur in the physical properties of the ingredients of solutions, such as dissolving salt in water or adding lemon juice to water.

Highlights from Science Information Booklet: ~ It is important for students to realize that solutions are a type of mixture. Students should also be aware that the parts of mixtures do not chemically change and that mixtures can be physically separated into their original components. ~ In their knowledge of solutions, students should understand that as solids dissolve, they do not “disappear” but break apart into individual particles. This slide is teacher information. Teachers may want to delete this slide from the power point before showing it to the students.

Mixture – a combination of two or more substances that can be separated. Each substance keeps most of its own physical properties. Solution – a liquid mixture. Solutions are often solids dissolved into liquids.

For example, when you stir sugar into water, the sugar becomes harder to see. When you taste the water, it now tastes sweet. The sugar has changed, in shape and size. The sugar particles are evenly mixed with the water particles. We say that the sugar has dissolved into the water. dissolve – the process of a substance mixing with a liquid so evenly, you can’t tell one substance from the other

Mixture of Water & Sugar The sugar dissolves into the water to form a solution.

Did You Know??? The hotter the liquid, the faster substances, such as sugar, salt, tea or coffee, will dissolve. Solutions can be separated! Usually, solutions can be separated by letting the liquid part of the solution evaporate.

Use the following website to complete an activity about solutions. Solution Activity

Solution or Not does not dissolve dissolves Use the tree diagram above to list items that dissolve and items that do not dissolve from the website.

Solutions or Not does not dissolve dissolves sugar salt instant coffee Does your list look like this??? Solutions or Not does not dissolve dissolves sugar salt instant coffee sand flour

GIVE IT A TRY! * Test your knowledge about solutions by answering the next 4 questions

When the sugar and water in the beaker are combined, they will create a solution because - the water will now turn into a gas the sugar will dissolve into the water the water will dissolve into the sugar the two substances are chemically combining and chemically changing their properties

B is the correct answer! Remember a solution is created when a solid is dissolved into a liquid. The sugar is being dissolved by the water. The sugar would not make the water change into a gas. Water does not dissolve into sugar. The substances in a solution do not change chemically and do not change their chemical properties.

2. When placed in a container full of water, which of the following would create a solution? sand pebbles pepper salt

The correct answer is D. Salt would dissolve into the water. Even though the salt particles are too tiny to see, they are still there. They have spread out evenly throughout the water. Sand, pebbles, and pepper would not dissolve into the water, and would therefore not create a solution. You would still be able to see them in the water and none of their properties would change.

3. Which of the following is an example of a solution? glass of Kool-Aid bowl of salad tablespoon of salt cup of sugar

The correct answer is A. Kool-Aid is an example of a solution because of the things that are dissolved into the water. For example, to make Kool-Aid you would use a powdered flavoring and sugar. Salad is an example of a mixture. The items put into a salad keep their physical properties and they can be easily separated. Salt and sugar can be used to make a solution but by themselves they are simply a substance.

4. Some students wanted to test the rate at which salt dissolves in water. They put 10g of salt and 200mL of water into each beaker. In which beaker will the salt dissolve the fastest? Beaker K C. Beaker M Beaker L D. Beaker N

The correct answer is D. Remember that a substance will dissolve faster into a liquid that has been heated to a higher temperature. Beaker N has the greatest temperature at 35° Celsius. This means that the salt will dissolve at a faster rate than in the other beakers.