# Lesson 10: Mixtures of Matter - Part 2

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1 Science Unit: Matter Lesson 10: Mixtures of Matter - Part 2 School year: 2004/2005 Developed for: Developed by: Grade level: Duration of lesson: Notes: Queen Alexandra Elementary School, Vancouver School District Paige Axelrood (scientist), Nancy Arnold and Karen Dixon (teachers) Presented to grades 1-2; appropriate for grades 1-4 with age appropriate modifications. 1 hour and 20 minutes with extension activities for 1 hour and 20 minutes Please see the Matter unit, Lesson 9, Mixtures of Matter Part 1, available from the Scientist in Residence Program website Objectives 1. Learn about mixtures of matter with a focus on liquid mixtures and liquid + solid mixtures. 2. Discover how to make a solution by dissolving sugar in water. 3. Review that some mixtures of matter can result in a physical change to matter whereas other mixtures of matter may result in a chemical change to matter. 4. Review concepts learned about matter including the states of matter, changes to matter, and mixtures of matter. Background Information Matter is anything that occupies space. The three states of matter are solids, liquids and gases. A solid is a state of matter that has its own shape. The shape of solids can change but the solid material takes up the same amount of space. Liquids and gases are states of matter that do not have their own shape. Liquids take up the same amount of space regardless of the size and shape of the container. Gases do not always take up the same amount of space and you cannot pick up a gas unless it is contained in something. All matter is made up of molecules and molecules are made up of atoms and sub-atomic particles. Most types of matter are mixtures and contain more than one substance or chemical. Many solid objects contain a mixture of substances. For example, rocks are comprised of a mixture of different minerals. The substances in a mixture may or may not be uniformly distributed. Water is a very good solvent. Many types of matter can dissolve in water to form a solution containing tiny particles of matter that are evenly distributed throughout the liquid solution. Solutions can be a liquid dissolved in another liquid, a solid dissolved in a liquid, a gas dissolved in a liquid, or a gas dissolved in another gas. A suspension is a mixture of liquid and tiny solid particles, but these particles can settle out if the suspension is left undisturbed for a period of time. The substances in mixtures can be separated by a variety of methods based on the physical characteristics of the substances. Examples of methods to separate mixtures of matter include using a sieve or a magnet, decanting, filtration, distillation, evaporation, centrifugation, and chromatography. Vocabulary Matter: Mix: Something (a substance) that occupies space; what something is made of; the three states of matter are solids, liquids and gases; matter is made up of molecules. To put together or blend together. Matter_Lesson 10 1

4 Closure Discussion Review concepts regarding mixtures of liquids. 1. Activity 1: Curds and Whey What kind of changes did you see when you mixed vinegar and milk together? Is this change a physical change or chemical change? Do you think this change is a permanent change or reversible change? What discoveries did you make while mixing liquids together? 2. Activity 2: Mixing sugar and water together to form a solution What kind of changes did you see when you mixed sugar and water together? Was a solution formed when you mixed sugar and water together? How many teaspoons of sugar dissolved in the water? Is this change a physical change or chemical change? Do you think this change is a permanent change or reversible change? What do you think will happen if the water evaporates from the sugar solution? What surprised you when you mixed sugar and water together? References 1. e.enclyclopedia Science, Google Pp , DK Publishing Inc. 2. Hann, Judith How Science Works. A Reader s Digest Book. Pp Dorling Kindersley limited, London, England. 3. VanCleave, Janice Pratt Chemistry for Every Kid, 101 Easy Experiments that Really Work. Page 114, Curds and Whey. John Wiley & Sons, Inc. New York Solubility, Why do Some Solids Dissolve in Water? The Bodner Group, Division of Chemistry Education, Purdue University West Lafayette, Indiana Sugar Facts, The Sugar Association 6. Kitchen Chemistry: Fun Food Activities and Experiments by Christina Blassingame-Cleveland, Curds and Whey Oobleck and Glurch. Learning about Solids and Liquids, The University of Arizona, Tuscon, AZ. Teacher Assessment of Learning 1. Teacher will circulate throughout groups and listen to conversations for appropriate predictions and conclusions. 2. The teacher will review recording sheets for accuracy Matter_Lesson 10 4

6 Teacher Assessment of Learning When students are playing with Oobleck, teacher will ask questions to check for students ability to identify and explain the properties of Oobleck and how they can be changed. Matter_Lesson 10 6

7 Name: 1. Curds and Whey Milk Vinegar Milk + Vinegar What happened when you mixed sugar and water? I learned that: I was surprised by:

8 2. Water Sugar Water + Sugar How many teaspoons of sugar did you add to the water? What happened when you mixed sugar and water? I learned that: I was surprised by:

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