Distinguishing Between Chemical And Physical Changes Essay

Distinguishing Between Chemical And Physical Changes Essay

Length: 2239 words (6.4 double-spaced pages)

Rating: Better Essays

Open Document

Essay Preview

Lab Title: Distinguishing Between Chemical and Physical Changes in Matter

Purpose: The objective of this lab is to determine if there are chemical or physical changes that occur after mixing various forms of matter. To do this the following items are mixed together and macroscopic changes are observed and recorded: Starch + I2, Food coloring + NaOCl, Food coloring + CH3COOH, Red cabbage + NH3, Red cabbage + CH3COOH, NaHCO3 + NH3, NaHCO3 + CH3COOH, Na2CO3 + CH3COOH, MgSO4 + CH3COOH, MgSO4 + NH3 and MgSO4 + Na2CO3.

Materials: test tubes, cups, coffee filters, pipettes, red cabbage, distilled water, blue food coloring, Epsom salts (MgSO4), washing soda (Na2CO3), baking soda (NaHCO3), potato starch, vinegar (CH3COOH), bleach (NaOCl), clear ammonia (NH3), and iodine (I2).

Procedure: Before performing the experiments, de-clutter and clean the workstation, read the instructions and make sure to know how to operate all equipment. Next, predict the outcomes of each experiment. Then, put on the safety goggles and create the solutions.

The red cabbage indicator solution takes the longest to make. Therefore, it is wise to make this first. To do this, cut up half a head of cabbage, immerse it in a pan with distilled water, cover the pan and heat the pan until the water boils. Boil for five minutes, then turn off the heat and let the pan and its contents cool to room temperature. Next strain the contents of the pan through the coffee filter. The goal is to remove the cabbage and be left with only the purple liquid solution. Discard the cabbage and keep the purple solution.

Next, prepare the rest of the solutions and label the cups in which they are being deposited:

• Compose the MgSO4 solution by combining approximately ¼ teaspoon (tsp.)...


... middle of paper ...


...leting this lab in the future it would help to record the temperatures of the combining solutions to determine if there was a change in temperature and therefore a chemical reaction. Also, it would be wise to close the windows and perform the experiment in a more enclosed space. No changes in smell were noted during this experiment. It is possible that this occurred but was not noted because the experiment took place in a room with a breeze and the smells could have dissipated before they could be noted. Most importantly, it would be helpful if studies were done on the final solution to determine if it is indeed a different chemical composition than the starting matter.






Reference:

Brown, T. L., LeMay, H. E., Jr., Bursten, B. E., Murphy, C. J., Woodward, P. M., & Stoltzfus, M. W. (2015). Chemistry: The Central Science (Vol. 13). Pearson Education, Inc.

Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »

Physical And Chemical Changes And A Learning Segment That Is Developmentally Appropriate For Fifth Grade Students

- When a student peers around, there are copious changes taking place and though students may not realize it until fifth grade, there is a system to characterize these changes as either a chemical or physical change. In fifth grade science, students are able to learn about the world around them, by experimenting and observing, and teachers and students will utilize these skills to develop a greater knowledge of chemical and physical changes. This paper’s purpose is to inform one about physical and chemical changes, and then explain how it can be beneficial in a learning segment that is developmentally appropriate for fifth grade students....   [tags: Chemical reaction, Chemistry, Chemical change]

Better Essays
786 words (2.2 pages)

Investigationg of Chemical and Physical Changes Essay

- Investigationg of Chemical and Physical Changes Why I am conducting this experiment. In order to learn how to recognize chemical and physical changes, I have to carry out this experiment to see different chemical and physical changes of different substance. How can we recognize physical changes and chemical changes. ----------------------------------------------------------- A chemical change involves a creation of a new substance, but a physical change doesn’t involve any creation of any substance....   [tags: Papers]

Free Essays
1153 words (3.3 pages)

Benzene: The Physical Properties and Chemical Properties Essay

- Benzene is a chemical compound used in our everyday lives. Benzene is used to make chemicals and other household products. The chemical formula of Benzene is C6H6. Benzene’s atomic structure is a hexagon with a carbon atom and a hydrogen atom bonded to each shown in (Figure 1). When Benzene was first discovered it was called hydrocarbon. The chemical that we now call Benzene was discovered in 1825 by Michael Faraday. Michael Faraday discovered Benzene from an oily film that deposited from the gas used for lighting....   [tags: chemical, toxic, exposure]

Better Essays
844 words (2.4 pages)

Characteristics And Elements Of Post Depositional Processes That Result Physical And Chemical Changes

- Diagenesis is referred to the combination of post depositional processes that result physical and chemical changes in the initial sediment. In case of carbonates, such processes usually involve dissolution of primary minerals (e.g. aragonite, high-Mg-calcite) and precipitation of secondary minerals (e.g. low-Mg-calcite). Diagenesis is known to have substantial influence on the elements and isotopes in marine carbonates. In particular, the elements that are present in trace abundance are more sensitive to diagenetic alteration relative to the major elements....   [tags: Sedimentary rock, Fossil, Carbonate, Carbon]

Better Essays
839 words (2.4 pages)

Chemical And Physical Properties Of The Substances Essay

- Name: Sebastian Sak Lab Partners: Timothy Gronet TA: Feifei Xu Determined Chemicals Through Different Chemical and Physical Properties Purpose: In the lab, common household chemicals will be studied to identify the substances. Chemical and physical properties of these different chemical will aid in identifying the substances, all of which are white, solid substances. Procedure: The experiment was performed based on the procedure in the lab handout “Exp. #5: Chemicals in Everyday Life.” The sulfuric acid test originally in the procedure was removed along with the sugars....   [tags: Solubility, Precipitation, Sodium chloride]

Better Essays
1350 words (3.9 pages)

Physical And Chemical Properties Of Water Essay

- Physical and Chemical Properties of Water Physical Water is the most cohesive non-metallic liquid. Hydrogen has a positive charge and Oxygen has a negative charge, so they attract each other and form a bond. Capillary action happens because of waters cohesiveness and stickiness. Capillary action occurs when the adhesion of water to the sides of the vessel it is in are stronger than the forces between the molecules. Another physical property of water is its color, water is actually not colorless, despite popular belief, but is actually slightly blue tinted....   [tags: Water, Atom, Oxygen, Fundamental physics concepts]

Better Essays
1093 words (3.1 pages)

Essay about A Experiment On The Chemical Equation

- In the demo experiment, we placed 10 grams of Ammonium dichromate in the form of a solid before starting the experiment. When the experiment begins the Ammonium dichromate is burned up and then produces Chromium (III) oxide as a solid, Nitrogen gas and water in form of a gas. In the experiment, we combined Zinc Chloride and Sodium Sulfide in which both chemicals are aqueous. The result of the combination was Zinc Sulfide a solid and Sodium Chloride an aqueous solution. In the alternate experiment, we combined Lead (II) Nitrate and Potassium Iodide in which both chemicals are aqueous....   [tags: Chemistry, Chemical reaction, Chemical equation]

Better Essays
1257 words (3.6 pages)

Chemical Reactions Of Chemical Kinetics Essay

- Chemical kinetics is a branch of chemistry which refers to chemical reactions with respect to reaction rates, effect of various variables, re-arrangement of atoms, formation of intermediates and much more (Chung Chieh, 2016).The importance of chemical kinetics is that it provides evidence for the mechanisms of chemical processes and provides a very detailed description of what happens to each molecule —which bonds are broken and formed, and how the three-dimensional shapes of the chemicals changes during the course of a chemical reaction (Keith J....   [tags: Chemical kinetics, Chemical reaction, Chemistry]

Better Essays
1084 words (3.1 pages)

Changes in Soil Physical, Chemical, and Biological Properties Caused by Artificial Drainage of Wetlands

- Changes in Soil Physical, Chemical, and Biological Properties Caused by Artificial Drainage of Wetlands Wetland soils are extremely varied. They are found from the tropics to the subarctic. They can be seasonal or year-round, freshwater or saltwater, organic or mineral. The one thing that all of them have in common is that for at least part of the year they are saturated with water. This saturation has a significant impact on the soil's physics, chemistry, and biota. However, over the past century more than half of all the wetlands in the United States has been drained for agriculture and other uses such as construction....   [tags: Environmental Environment Research]

Better Essays
1901 words (5.4 pages)

The Effect of Clearcut Deforestation on Physical and Chemical Essay

- The Effect of Clearcut Deforestation on Physical and Chemical Properties of Soils Clearcut deforestation is done for a variety of different purposes. Frequently, sites owned by lumber companies are clearcut, replanted, fertilized, and maintained to keep a cyclic supply of lumber of uniform species, size, and age. Some lumber companies claim that in their tree harvesting practices can raise mature lumber in forty years (Wood, 1971), while most tree harvesting is on 70-100 year cycles. Deforested land can alternately be used as grazing or farming land....   [tags: Environment Ecology Trees Essays]

Better Essays
1257 words (3.6 pages)