Bubbles bubbles. You may not remember when you
Bubbles are everywhere and have been a part of most everyone’s life. Even in the earliest days bubbles some of the first things you play with are bubbles. You may not remember when you were that young but bubbles have been in your childhood at least one hundred times or more. They are some of the most amusing things you will ever play with. It doesn’t matter how old you are you will always get a laugh out of them or a smile or to but you will always have fun with them.
Now, bubbles in the past ten years have gotten bigger and longer lasting. You can even make different color bubbles. Most every convenient store and some gas stations sell bubbles. The coolest thing about bubbles are the colors they make. They have all the colors of the rainbow in them because they work the same way a rainbow does. When you look at bubbles you do not see all the colors at once but just a few at a time. That is because bubbles move a lot there for when the light shines through the liquid it is at a different angle then it was before. If you look at bubbles and pay attention the liquid looks like it is spinning and that’s because it is. When the air around the bubble moves it creates friction on the liquid and spins it around in all different directions. Even when the bubble is sitting on something the liquid can still spin on whatever it is sitting on.
Some people might wonder why bubbles are round. That is easy to answer after you think about it a while. Bubbles are round because there is surface tension that pulls the liquid into the closest groupings as possible. The size of the bubble is determined by how much is inside the bubble. The bubble will shrink until the pressure inside the bubble is the same as it is outside of the bubble. If you were to make a bubble without air in it, it would shrink until it forms like a rain drop. If anyone were to try to make a big bubble it would burst as soon as all the extra liquid was used up.
A simple solution is basically two substances that are evenly mixed together. One of them is called the solute and the other is the solvent. A solute is the substance to be dissolved. The solvent is the one doing the dissolving. As a rule of thumb, there is usually more solvent than solute. The amount of solute that can be dissolved by the solvent is defined as solubility.
Science has special names for everything. They also have names for the different types of homogenous mixtures. Solution is the general term used to describe homogenous mixtures with small particles. Colloids are solutions with bigger particles. Colloids are usually foggy or milky when you look at them. In fact, milk is an emulsified colloid.
In chemistry, a mixture forms when two or more substances are combined such that each substance retains its own chemical identity. Chemical bonds between the components are neither broken nor formed. Note that even though the chemical properties of the components have not changed, a mixture may exhibit new physical properties, like boiling point and melting point. For example, mixing together water and alcohol produces a mixture that has a higher boiling point and lower melting point than alcohol.
Two broad categories of mixtures are heterogeneous and homogeneous mixtures. Heterogeneous mixtures are not uniform throughout the composition, while homogeneous mixtures have the same phase and composition. The distinction between heterogeneous and homogeneous mixtures is a matter of magnification or scale. For example, even air can appear to be heterogeneous if your sample only contains a few molecules, while a bag of mixed vegetables may appear homogeneous if your sample is an entire truckload full of them. Also note, even if a sample consists of a single element, it may form a heterogeneous mixture. One example would be a mixture of pencil lead and diamonds.
Particles in a suspension are often large enough that the mixture appears heterogeneous. Stabilizing agents are required to keep the particles from separating. Suspensions may be separated using either decantation or centrifugation. Examples of suspensions include dust in air, vinaigrette, mud, sand, and granite.
Just because they mix two chemicals together, do not expect you will always get a mixture. If a chemical reaction occurs, the identity of a reactant changes. This is not a mixture. Combining vinegar and baking soda results in a reaction to produce carbon dioxide and water. So, you don’t have a mixture. Combining an acid and a base also does not produce a mixture.
If you put sand into a glass of water, it is considered to be a mixture. You can always tell a mixture, because each of the substances can be separated from the group in different physical ways. You can always get the sand out of the water by filtering the water away. If you were busy, you could just leave the sand and water mixture alone for a few minutes. Sometimes mixtures separate on their own.