Separating Mixtures

Take two test tubes, label each test tube according to solvent. Add 1 mL of distilled deionized water to the first test tube and 1 mL of ethanol to the second test tube. Next, add 1 mL of the unknown liquid to each test tube, shake for a small period of time, and observe patiently. During this observation, you will be able to determine whether the two liquids mix completely, slightly, or not at all. If the two liquids mix completely, then you should be able to see one liquid mixed together without a visible line indicating two different substances. This means the two liquids are considered soluble. If the two liquids

In the lab titled “Mixed Substances,” our objective was to see how properties of individual substances compare with properties of mixed substances. A mixture is a combination of two or more substances that are mixed physically but not chemically. For example, trail mix would be a mixture due to the dissimilar parts combined physically. There are two types of mixtures, homogeneous and heterogeneous. Homogeneous mixtures are uniform in structure or composition.

The composition of a pure substance is constant, and thus pure substances have characteristic physical properties that do not change and this is why we are able to separate each element in this lab experiment. Examples of physical properties that can be used to describe pure substances include solubility, conductivity, magnetism, density, boiling point, and melting point.

The cause of static electricity is when there is an unbalanced molecular construction or non conductive insulators such as plastic, glass, ceramics, and other non conductive materials

his brother Mark was having difficulties in chemistry, especially with understanding what dissolved,solute,aqueous and solvent meant. He sat down with Mark after saying hi to the family, and told him that when a substance is dissolved it’s when the molecules of solute are completely separated in a solution,that the solvent will always be the liquid and solute what we are dissolving in it, and that aqueous is simply water.

Ionic compounds are soluble in water to a certain point depending on the compound. The level of solubility changes among different compounds. Some ionic compounds can completely dissolve in water and appear to be a homogeneous mixture. Although, some ionic compounds dissolve very little, and could be considered insoluble, since it does not dissolve fully. Depending on the compound, the level of solubility can be high or low. However, ionic compounds could dissolve to a certain degree. If the solution appears to be a heterogeneous mixture, many may assume through visual representation that it may be insoluble. As stated previously, the smallest amount of solubility should be considered. To confirm whether or not the substance is soluble, observe the efficiency when conducting electricity. Due to practical reasons, the slightest solubility could be considered insoluble by people.

5. Substances in a mixture can be separated depending on the substances involved. You can use a magnet to separate a magnetic substance form a non-magnetic one, filtering, and evaporation. For example, when I put the

Aqueous solutions of ionic substances will be experimented with in this Ionic Reactions lab. Aqueous solutions are solutions that water is solvent. After ionic substances dissolve in water, ions separate and become surrounded by water molecules. When these ion separate, its called dissociation.

Introduction: Voltage can be thought of as the pressure pushing charges along a conductor, while the electrical resistance of a conductor is a measure of how difficult it is to push the charges along. Using the flow analogy, electrical resistance is similar to friction. For water flowing through a pipe, a long narrow pipe provides more resistance to the flow than does a short fat pipe. The same applies for flowing currents: long thin wires provide more resistance than do short thick wires. The resistance (R) of a material depends on its length, cross-sectional area, and the resistivity (the Greek letter rho), a number that depends on the material. The resistivity

Voltage represents electric potential energy per unit charge. If a unit of electrical charge was placed in a location, the voltage indicates the potential energy of it at that point. Basically, it is a measurement of the energy contained within an electric circuit or electric field at a given point.

To first complete this lab the students should know what a solute, solvent and saturated are. A solute is a substance that dissolves in the solvent in the solutions. A good example of a solute can be sugar when put in water. When the sugar is stirred and mixed into the

Atoms consist of three main components: neutrons (no charge), electrons (negative charge) and protons (positive charge). The change on an electron is -1.6 x 10-19Coulombs. Coulombs (C) are the unit of charge used which is defined as the electric charge carried by 1 ampere of current in 1 second.9 All objects are comprised of atoms creating an overall charge which in most cases is neutral, although objects that have excess electrons create an overall negative charge whereas an object with fewer electrons has an overall positive charge. According to the law of electrostatics, atoms with unlike charges attract, while like charges cause the particles to repel. As electricity is a flow of negatively charged particles, when placed in a circuit, the particles will flow from the negative terminal to the positive terminal due to being repelled from the

The battery is a device that converts chemical energy into electricity. Like most important inventions, this device has many different versions originating from the 19th century

What if we dissolve some sand in the water? After a while, all the sand particles would be settled down at the bottom of the water and we can recognize them separately. So we would call this mixture a heterogeneous mixture.

It is known that different substances dissolve at different rates. The process of a substance dissolving is referred to as dissolution and is a chemical reaction between the solute and the solvent. A chemical reaction is a process in which one or more substances are converted into one or more substances that differ from the initial substance (Silberberg 2010). The initial substance is referred to as the reactant while the changed substance is referred to as the product. In other words, the reactants are the substances that take part in the chemical reaction while products are what is produced as a result of the reaction taking place (Mader, Windelspecht 2013).