Once plated with zinc, the penny was removed using tongs and placed in a beaker of water to clean. ... Using the tongs, each side of the penny was placed in the flame of the burner for several seconds and then the penny was put back in the water. ... Results The surface of the penny that was in contact with the zinc filings changed from light brown in color to silver in color. ... Instead, they changed from light brown or copper in color to silver and gold in color. ... The penny turned from silver in color to gold in color while the penny was in the burner flame. ...

• Word Count: 601
• Approx Pages: 2
• Grade Level: High School

It then changes color when this happens. This color change is called the "end point" of the titration. ... To each sample about 100-mL of distilled water was added and swirled to dissolve the salt. ... The color change (light pink) showed when this happens. This color change was the "end point" of the titration. ...

• Word Count: 911
• Approx Pages: 4
• Grade Level: High School

Place a spatula of sodium chloride in 2-3 ml of water. Mix and hold over flame until the water evaporates. ... Observe the color and the luster of the metal. ... Physical changes can be observed by changes in color, size, or shape. ...

• Word Count: 380
• Approx Pages: 2
• Grade Level: High School

We started our separation using vacuum filtration, first with ethyl acetate, and then water. ... Water was not used first in our separation technique because one of our organic compounds, m-nitroaniline, were slightly soluble in water (we guessed that we had m-nitroaniline and naphthalene due to our soil's distinctive color and odor). Had we used water first, the liquid layer from the separation would be composed of both inorganics and some organics, requiring us to perform extra separation techniques again on the water solution. ... The resulting solution consisted of m-nitroalinine diss...

• Word Count: 3975
• Approx Pages: 16
• Has Bibliography
• Grade Level: High School

Materials 1% Sucrose (1g/99ml of distilled water) Buffers (pH 1.0, 4.4, 9.2, 13.0) Sucrase (1 packet yeast to 500ml distilled water) Ice Bath and Warm Water Bath Test Tube Rack Test Tubes Pipette Beaker Test Tube Clamps Benedict's Solution Thermometer Distilled Water Marker Hot Plate III. ... To this was added our enzyme sucrase and water. In test tube 1 there was no sucrase and 3.0ml of water, used as our control, tube 2 had 0.5 ml of sucrase and 2.5ml of water, tube 3 had 1.0ml of sucrase and 2.0ml of water, tube 4 had 1.5ml of sucrase and 1.5ml of water, and finally...

• Word Count: 705
• Approx Pages: 3
• Grade Level: High School

Materials: test tubes, 13x100-mm(4) pipet dropper test tube rack safety glasses .1 M solutions of: Hexanes NaF 3.0M NH3(aq) NaCl chlorine water NaBr NaI Ca(NO3)2 AgNO3 Procedure: Part I 1. ... Then add chlorine water. 10. ... NaF + Ca(NO3)2: Cloudy color NaCl + Ca(NO3)2: NR NaBr + Ca(NO3)2:NR NaI + Ca(NO3)2:NR 3. ... There were two layers in the aqueous solutions because hexanes and water are immiscible. ...

• Word Count: 488
• Approx Pages: 2
• Grade Level: High School

Acids which are not combined with water are dangerous - they change so fast that they can react with skin and cause burns. Bases are bitter, water-soluble substances which are also very useful. ... The solutions they form with water are called basic solutions. ... Other characteristics to watch for when mixing two or more substances are heat and light, flames, explosion, color change, and evolution of gas. ... You need water to help it show. ...

• Word Count: 720
• Approx Pages: 3
• Grade Level: High School

Introduction The periodic table currently contains over 100 different elements that are known to this universe. Each element exhibits both chemical and physical properties which make them unique from one another. To get a closer look of things, everyone used a spectroscope to examine the patterns a...

• Word Count: 527
• Approx Pages: 2
• Grade Level: High School

All things were believed to be made of four elements, fire, water, air and earth, and gold was the perfect combination of the four. ... Since the alchemist had seen air and wood turn into fire, and water to air they believed that any change in physical state is possible. ... Democritus claimed to have produced gold and wrote how in one of his books, but most believe he made brass which has a similar color. ...

• Word Count: 1307
• Approx Pages: 5
• Has Bibliography
• Grade Level: High School