Natural, Social and Cultural Sciences
Separation of mixtures
Activity 1
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Activity 1

Types of mixtures

When we think of mixtures we think of mixing some substances with others. Sometimes, we can distinguish the substances after mixing. For example, we can distinguish the chocolate chips in chocolate biscuits. Other times, we cannot identify the original components. For example, if we mix yellow and blue paint we get green paint and we cannot distinguish the blue and yellow in the green paint.

There are different types of mixtures and in this activity we will find out how to classify them.p>

Activity – part one

To begin with mixtures, lets think about what we ate yesterday. Make a list of everything you ate for breakfast, lunch, tea and dinner. Remember to include drinks too!

Download the following table, (activity_1.zip) these questions will help you:

Breakfast:

  • Did you drink milk or chocolate milk?
  • Did you add sugar, honey or sweeteners?
  • Did you eat white or wholemeal bread, toast or biscuits?
  • Did you eat fruit or juice?

Lunch

  • Did you eat vegetable soup or rice?

  • What was the main dish?

Write down all the ingredients that you remember. If you don’t know how the food was prepared, ask a friend or an adult or ask the cook. Find out if they added salt, oil, vinegar or any other condiment and write in down too.

Do the same with tea and dinner.

When you finish, save the list..

Your list should look something like this:

Breakfast

Drink:

Chocolate milk

Ingredients:

  1. Cocoa

  2. Milk

  3. Sugar

Food:

Biscuits

Ingredients:

  1. Flour

  2. Sugar

Think about your breakfast… Did you use powdered cocoa? How did you make it? Did you put the cocoa in the cup, add milk and then sugar? Did you mix everything together? How many ingredients were in your drink? While you were drinking it, could you identify the milk or the sugar?

Lunch

Drink:

Water

Ingredients :

  1. Water

Starter

Salad

Ingredients:

  1. Tomatoes
  2. Green peppers
  3. Onions
  4. Asparagus
  5. Olive oil
  6. Vinegar
  7. Salt

First course:

Macarroni carbonara

Ingredients :

  1. Macarroni
  2. Bacon
  3. Salt
  4. Cream
  5. Oregano

Second course:

Veal and chips

Ingredients:

  1. Veal
  2. Salt
  3. Parsley
  4. Potatoes

Dessert:

Meringue milk

(see attached recipe: recipe.pdf)

Ingredients:

  1. Milk
  2. Sugar
  3. Cinnamon
  4. Lemon
  5. Egg

Let’s think about salad. What are the ingredients? Tomatoes, peppers, onions, asparagus, oil, vinegar and salt. But how many can you identify? Only tomatoes, peppers, onions and asparagus, because the dressing, oil, vinegar and salt are mixed in with the other ingredients.

The cocoa for breakfast and the salad for lunch are both mixtures.

So, what is a mixture?

It is the combination of two or more substances. But here are two very different mixtures

  • In the salad you can clearly see and distinguish some of the different components. This is aheterogeneous mixture, (where the word “hetero” means “different” because each part of the mixture is different). Heterogeneous mixtures consist of visibly different substances that can be seen with the naked eye and with a microscope.

  • In chocolate milk, it is not possible to see or distinguish the components. We see the combination of ingredients as one substance. This is a homogenous mixture (where “ homo” means “same”) it has the same uniform appearance and composition throughout. We cannot distinguish the different components with the naked eye or with a microscope

In this video you can see some usual household mixtures:

http://youtu.be/jUh-BgiDxb4

>

Do the following exercise to distinguish homogeneous mixtures, heterogeneous mixtures and pure substances: Types of mixtures

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Credits

© Itinerarium 2011

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
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