Activity 1. Part two
Types of mixtures: solutions
Think again about the salad: it has seven components but we can only distinguish four (tomatoes, peppers, onion and asparagus.) So, we say it is a mixture where four parts or phasescan be identified. In the case of chocolate milk, there are three components (milk, cocoa and sugar) but it seems there is only one. We can only see onephase. A phase is a visibly distinct portion of matter. So what can we conclude? That only one phase exists in homogenous mixtures. We also call these types of mixturessolutions.
Solutions can be obtained by mixing two or more liquids, liquids and solids or by mixing gases, etc.
In the case of chocolate milk, in the moment the sugar is added, we can no longer see it. In solutions this is called the solute the substance in the smallest amount. Once it is mixed in it seems to “disappear” because the solute dissolves.
The substance in the larger amount is called the solvent. In the case of chocolate milk, it is the milk.
Source:http://estudios-quimicos.blogspot.com/ 2010_06_01_archive.html
Activity – part two
In the example, as well as chocolate milk and salad, other food was included like, macaroni, meringue and water. Are these mixtures or pure substances? Why?
Talk together and decide. If you think they are mixtures, discuss which type of mixtures they are, homogenous or heterogeneous.
Remember your list of food and ingredients you made earlier. Now it’s time to include two new columns in your table. The columns will indicate:
the type of mixture (homogenous or heterogeneous)
and the quantity of phases.
Check to see if any component is missing from the column of ingredients.
Now you understand why it was important to consult the person who prepared the food. Only this way can you be sure how many ingredients and what components were included!
Follow these steps to add columns to your table:
Position the cursor in the last column of the table>
Select the menuTable, then Insert and finally Columns.
In the next window increase to 2 the number of columns and select Behind. Click on Accept.
Now your table is ready to complete!
When you have completed the table, do the following exercise. Check that your table is correct according to these answers: Select.
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Index
- Separation of mixtures
Credits
DIRECTOR: Narcís Vives
COLLABORATORS:
- EXECUTIVE PRODUCER: Antonio Cara
- CONTENT MANAGERS: Mª Cristina Pérez and Magdalena Garzón
- COORDINATOR OF THE NATURAL AND SOCIAL SCIENCE AREAS: Elena Anguera
- TECHNICAL DIRECTOR: Maite Vílchez
- AUTHOR: Lorena Natalia Inzillo, María Inés Rodríguez and Miguel Poza
- CORRECTORS OF STYLE CASTELLANO VERSION: Anna Betriu and Joan Martín
- BASQUE ADAPTATION: Bakun itzulpen eta argitalpen zerbitzuak, s.l.
- ENGLISH ADAPTATION: Sarah Richards
- LAYOUT: Maite Vílchez and Miquel Gordillo