Mixtures and Solutions: Discover How Materials Combine!

When you put two or more materials together, you create a combination. This is called a physical change because the materials change how they look, but they do not turn into something brand new.

You can find combinations all around you in your kitchen, your lunchbox, and even in a glass of water!

A mixture is made when two or more materials are put together and each material keeps its own properties. You can still see, touch, and separate each part.

For example, when you mix sand and pebbles, the sand is still sand and the pebbles are still pebbles. You can pick them apart! Trail mix is another great example you can still see the raisins, peanuts, and granola inside the bowl.

In a mixture, no new material is created. The parts just sit together. Because the materials do not change into something new, making a mixture is a physical change.

A solution is a special kind of mixture. It forms when one material dissolves completely into another material, usually a liquid. When something dissolves, it spreads evenly through the liquid and you can no longer see it.

When you stir salt into warm water, the salt dissolves and seems to disappear. The salt is still there you just cannot see it anymore. This makes a solution called salt water. Sugar stirred into water works the same way!

Oil and water are different they stay in two separate layers, so they make a mixture, not a solution.

Mixture: A mixture is what you get when two or more materials are combined together. Each material keeps its own look and properties, and you can still see and separate the parts. For example, a bowl of trail mix with raisins and nuts is a mixture.

Solution: A solution is a special mixture where one material dissolves completely into a liquid so you cannot see the separate parts anymore. Salt water and sugar water are examples of solutions.

Dissolve: To dissolve means a solid breaks up and spreads evenly into a liquid until you cannot see it anymore. For example, sugar dissolves when you stir it into water.

Separate: To separate means to pull the parts of a mixture apart. For example, you can separate raisins from trail mix by picking them out with your fingers.

Material: A material is any kind of stuff that objects are made of. Sand, water, salt, and pebbles are all materials.

Solid: A solid is a material that has its own shape and does not flow. Pebbles, sand, and salt grains are all solids.

Liquid: A liquid is a material that flows and takes the shape of its container. Water and juice are liquids.

Blend: To blend means to mix materials together. When you blend ingredients, you combine them into one mixture.

Ingredient: An ingredient is one part that goes into a mixture. For example, raisins and nuts are ingredients in trail mix.

Filter: A filter is a tool with tiny holes that you can use to separate solid pieces from a liquid. For example, you can use a strainer to filter sand out of water.

Solute: The solute is the material that dissolves in a solution. For example, in salt water, the salt is the solute.

Solvent: The solvent is the liquid that does the dissolving in a solution. Water is the most common solvent. In salt water, water is the solvent.

Soluble: Soluble means a material can dissolve easily in water. Salt and sugar are soluble materials.

Physical Change: A physical change is when a material changes how it looks or its shape, but it is still the same material. Making a mixture or a solution is a physical change because no brand-new material is created.

You can make your own mixture by combining dry cereal, raisins, and nuts in a bowl. Look closely can you still see each ingredient? Try picking out just the raisins. This shows you that a mixture can be separated!

You can also make a solution by stirring a spoonful of sugar into a glass of warm water. Watch the sugar disappear as it dissolves. The water will taste sweet, even though you cannot see the sugar anymore.

Try mixing sand and water in a cup. Does the sand dissolve? No it sinks to the bottom. You can use a strainer to filter the sand back out, which shows you it was a mixture, not a solution.

Learning about material combinations, mixtures, and solutions is an important part of understanding physical changes. A physical change means a material changes its shape or form, but it is still the same material. Cutting paper, folding clay, and mixing materials are all physical changes.

As you keep learning science, you will use what you know about mixtures and solutions to explore even more exciting topics about how materials behave and change in the world around you.

This topic is part of the chapter on Physical Changes. Everything you learn here about combining materials connects to the big idea that physical changes do not create new materials they just change how materials look or where they are.

As you grow as a scientist, you will build on what you know about mixtures and solutions to explore more about how materials interact, how to separate them, and how scientists use these ideas every day in the real world.