4 1 A Chapter WHAT ARE MIXTURES & SOLUTIONS A mixture is a combination of two or more substances We encounter mixtures every day They can be made of solids gases or liquids Pouring milk into cereal makes a milk and cereal mixture Salad is a mixture of different ingredients Even air is a mixture of different gases A solution is a type of mixture In a solution one substance is dissolved in another Stirring salt into water for example makes a saltwater solution In some mixtures you can easily see the different parts But you can't see all the parts in a solution A saltwater solution looks like regular water You can't see the salt that is dissolved in it
The water in the ocean is a saltwater solution
6 Chapter 2 HETEROGENEOUS OR HOMOGENEOUS Mixtures are either heterogeneous or homogeneous Homogeneous mixtures are the same throughout Mixing sugar in water creates a homogeneous mixture The dissolved sugar spreads out evenly through the water If you sampled different parts of the mixture they would all contain the same amount of sugar A heterogeneous mixture is not the same throughout Different parts of the mixture have different substances A chocolate chip cookie is a heterogeneous mixture If you took samples of the cookie the samples would be different from each other Some samples would have chocolate chips Others wouldn't
One method scientists use to tell whether a mixture is homogeneous is viewing it with a microscope
