Unit 4 Lesson 4 What Are Mixtures and Solutions? Copyright © Houghton Mifflin Harcourt Publishing Company

Unit 4 Lesson 4 What Are Mixtures and Solutions? Florida Benchmarks SC.5.P.8.2 Investigate and identify materials that will dissolve in water and those that will not and identify the conditions that will speed up or slow down the dissolving process. SC.5.P.8.3 Demonstrate and explain that mixture of solids can be separated based on observable properties of their parts such as particle size, shape, color, and magnetic attraction. Copyright © Houghton Mifflin Harcourt Publishing Company

Unit 4 Lesson 4 What Are Mixtures and Solutions? Matter Mix-Up A mixture is a combination of two or more substances that keep their identities. Making a mixture is a physical change. Copyright © Houghton Mifflin Harcourt Publishing Company

Unit 4 Lesson 4 What Are Mixtures and Solutions? Find a Solution! A solution is a mixture that has the same composition throughout. A solution forms when one substance dissolves in another. Copyright © Houghton Mifflin Harcourt Publishing Company

Unit 4 Lesson 4 What Are Mixtures and Solutions? Find a Solution! When a substance dissolves, it breaks into tiny particles. Those particles mix with the other particles in the solution. Not all substances can dissolve. For example, salt dissolves in water, but sand does not. Copyright © Houghton Mifflin Harcourt Publishing Company 5

Find a Solution! Many solutions are liquids. Unit 4 Lesson 4 What Are Mixtures and Solutions? Find a Solution! Many solutions are liquids. Some solutions, such as air and brass, are gases or solids. Copyright © Houghton Mifflin Harcourt Publishing Company 6

Separating Mixtures A mixture can be separated. Unit 4 Lesson 4 What Are Mixtures and Solutions? Separating Mixtures A mixture can be separated. Physical properties such as color, size, melting point, boiling point, density, and ability to dissolve can be used to separate mixtures. Mixtures can be easy or difficult to separate. Copyright © Houghton Mifflin Harcourt Publishing Company

Unit 4 Lesson 4 What Are Mixtures and Solutions? When One Isn’t Enough A sieve, or mesh screen, can be used to separate matter by particle size. A magnet can be used for separating items containing iron. Copyright © Houghton Mifflin Harcourt Publishing Company

Unit 4 Lesson 4 What Are Mixtures and Solutions? When One Isn’t Enough Filters can separate mixtures by allowing only the smallest bits of matter to pass through. Boiling and evaporation can separate mixtures as the liquid particles leave a solution. Dissolved particles stay behind. Copyright © Houghton Mifflin Harcourt Publishing Company

Recycling Mixtures Items returned for recycling need to be separated. Unit 4 Lesson 4 What Are Mixtures and Solutions? Recycling Mixtures Items returned for recycling need to be separated. Physical properties of recyclable items are used to separate them into bins. Metal, plastic, paper, and glass can all be recycled and turned into new products. Copyright © Houghton Mifflin Harcourt Publishing Company