Mixture Lab

Introduction The purpose of this Lab was to identify the density of the unidentified object and determine what substance the unidentified object given by the teacher was. The density calculated in the experiment will stay the same because the density of the unidentified object will stay constant. The Independent Variable of this experiment was the calculated density and the unidentified object given. The Dependant Variable for this experiment was the density.

In performing these sets of experiments, in which we would drop a water/water solution onto the surface of a penny, we were trying to test and experiment the bonding qualities of water when made into a solution compared to when the water is pure. When we dropped pure tap water on to a penny, the water, instead of flowing and spreading out, stayed together in a single drop on the penny. We wanted to see how different substances affected this phenomenon. When we formulated our guiding question we made sure to preserve these intents in the language: how do foreign substances influence the bonding quality and strength (to the top of a zinc penny in specific) of water? Since these experiments were conducted in groups, we set up a few roles to

We were asked to correctly communicate these findings as we tested each of the substances she had encountered with both water and hexane. In experiment number three, The Relationship Between the Volume of a Gas and the Temperature, we where given a list of materials and asked to come up with our own procedure, which we did using zip lock bags filled with air, and submerged fully in a measured amount of water in order to find the volume, and then the change in volume when the temperature of the water was increased. In the fourth experiment we were asked to find the temperature of heated water, based on the cold and warm water. The experiment also required that each section be preformed several times in order to ensure accuracy, and also asked that the experimental responsibilities be split up between lab partners, each doing a section of the testing. This gave us an opportunity to work together with our fellow lab partners, with no one person doing the bulk of the work.

This proves that the egg has a higher solute concentration then the vinegar. However, when the egg was placed in the corn syrup, its masses greatly decreased. The corn syrup has no water molecules, so to create equilibrium, the egg transferred its water molecules to the corn syrup,

a. Water boils to produce steam at 100 C (212 F) b. Water produces gas with sodium metal c. Water and oil separate when combined d. Water dissolves sugar 22. In the experiment, students put brine shrimp in water with different concentration of salt and counted the number. Which of the following changes to the experiment will increase confidence in the validity of the result? a. Count the number of dead brine shrimp instead of living brine shrimp b. Add more brine shrimp to the water with the highest salt concentration c.

When adding detergent to water, it sinks to the bottom of the beaker. When mixing them together, the detergent dissolves in the water. This shows once again, that water dissolves most substances, except

Q1. Repeat the candy experiment again, now with different type of candy 1. Smooth unwrapped candies of white and black color 2. wrapped with wrinkly plastic candies of white and black color After shaking in both the experiments how will the results differ in wrapped and unwrapped candies? If you repeat the candy experiment using smooth unwrapped candies of white and black color, you may find that the smooth candies mix together more easily than the wrapped candies.

The objective of the sludge lab was to determine how many different pure substances were in the sludge by using the methods and techniques we have learned throughout the year. We had to pick separation methods so we could separate our sludge and then test characteristic properties on our separated liquids and solids. This experiment made us use our knowledge on characteristic properties to pick the ones we should test to help us identify our pure substances. Characteristic properties are properties that help identify a solid or liquid. Each solid or liquid has a certain density, boiling point, solubility, flammability, so if you know what each one is then you can use that information to help you identify your solid or liquid.

Throughout the experiment, copper was altered a total of 5 times, but after the final chemical reaction, solid, elemental copper returned. Each time the solution changed color, a precipitate formed, or when gas appeared, indicated that a chemical reaction was occurring. For the first reaction, copper was added to nitric acid, forming the aqueous copper (II) nitrate (where the copper went), along with liquid water, and

Therefore, all the particles in the colder cooking oil came closer to each other making the substance become very thick. This is what happened in the experiment, when the corn syrup was placed in the cold water bath, the particles were not getting any energy so they were not moving as fast as the hot corn syrup. The particles were not going in different directions, but coming closer together. Since, the particles for the hot cooking oil are moving quicker and further away from each other so the substance was thinner therefore, the flow rate increased and viscosity decreased. For the cold cooking oil, the flow rate decreased and the viscosity increased because the particles were moving slowly with no energy source and coming closer together making the substance become thicker.

The cornstarch began to burn, which produced smoke, and is what also perhaps changed the color of the

What is (are) the product(s) in you experiment? - 6. What type of organic molecule is gelatin? - A protein 7. What type of organic molecule is bromelain?

The wax melted first, followed by the salt, and lastly the sugar. The salt not only burned before the sugar, but developed a brown color throughout most of the substance at a faster pace. In the water solubility test, the salt dissolved in the water, as soon as it was properly mixed and the sugar dissolved in the water as well, but was stirred for a longer period of time until it was completely dissolved. The wax did not dissolve in the water, however bits of the substance broke off from the main piece. With this information, the final results included: wax as a nonpolar covalent compound, since the substance melted first and was not soluble in water; salt as a polar covalent compound, since the substance was soluble in water and the second to melt; and sugar as an ionic compound because the substance melted last and was soluble in

A substance can be classified as homogeneous or heterogeneous. A homogeneous mixture is described as having the same properties

Material Solid Liquid Gas Explanation or Reason Plastic rule Steam from a kettle Paraffin Do some research to find out why cooking gas is kept in a pressurized gas cylinder? (2)