Things which dissolve in water

Sugar and salt are examples of soluble substances. Substances that do not dissolve in water are called insoluble. Sand and flour are examples of insoluble substances. Add a teaspoon of whichever solid you are testing to a glass of cold water and a glass of warm water, stir and observe the difference.

Watch to see if the solid dissolves in the warm water and cold water and if one is better than the other. Things like salt, sugar and coffee dissolve in water.

They are soluble. They usually dissolve faster and better in warm or hot water. Everything is made of particles which are always moving.

Did they need to change their answers? What do your results show you? Can you pick out which one are homogeneous mixtures? Read more about solutions below! It might just seem like you are making a bit of a mess, but you are actually experimenting with an important concept in chemistry called solutions. By mixing these solids solutes with a liquid solvent , you may or may not have created solutions. What is a solution or you might also hear it called a mixture? A solution is when one substance our solid is dissolved in another substance the water with an even consistency.

This is called a homogeneous mixture. We also do this when we experiment with growing crystals. You can mix in two or more substances but for our experiment, we are just mixing one solute and the one solvent together.

Generally, the solute is smaller in quantity than the solvent. What would happen if it were the other way around? Discover more fun and easy science experiments right here. Click on the link or on the image below.

Set up a whole candy dissolving science experiment with your leftover candy. Guide the groups as they conduct their tests, one substance at a time, in separate cups. For each test, ask students to observe the substance.

Ask, Is it a liquid or a solid? Next, have students measure about one teaspoon of the substance into one of the cups of water and stir until there is no change in the mixture.

Finally, they should note what happened and record their observations. When students have completed their investigations, discuss their observations. Expect the following results. Will dissolve disappear , leaving a clear solution. Sugar: Will dissolve disappear , leaving a clear solution. Will not dissolve; the mixture will be cloudy, because the large flour particles will remain suspended in the water example of a colloid.

Will not dissolve; the oil will float on top of the water because the oil is less dense, and because the oil molecules will not mix with the water molecules. Food coloring. Will dissolve; the resulting transparent liquid will be colored. Part of the coffee will dissolve in the water, coloring it brown; the remainder of the coffee woody parts of the coffee bean will not dissolve or disperse through the liquid and will float.

Ask, Which things disappeared into the water when you stirred? Do you think that they salt or sugar are still there? How could you figure this out?

Ask about the other substances. Have students think about things that remain in water after it is used for cleaning, rinsing, etc. This particular resource used the following sources:. Skip to main content. Aqueous Reactions. Search for:. Learning Objective Explain why some molecules do not dissolve in water. Key Points Water dissociates salts by separating the cations and anions and forming new interactions between the water and ions.