5. IV: The DC voltage and the concentration of salt in electrolyte. LevelsSalt:20m g Volt:1.5 Salt:40m g Volt:3 Salt:60m g Volt:4.5 Salt:80m g Volt:6 Number of Trials 4444 DV: The time taken to collect the released hydrogen gas. C: The amount of oxygen collected in the test tube and the surface are of copper wire exposed to the electrolyte solution.

6. Materials and Procedures 1- beaker Tap water 200 - milligrams of salt 1- stirrer 4 x 1.5V batteries and battery holder 2- jumper wires with crocodile clips at both ends 2 - test tubes 2 PVC (polyvinyl chloride) insulated copper wires (5mm2), each measuring 150 millimeters in length 1- digital weighing scale 1- stopwatch 1- pair of pliers 1- black permanent marker 1- Project Data Book SET-UP: 1. Using the pliers, strip both copper wires approximately 30 millimeters of insulation on both ends. Bend the wire in “S” shapes and place them inside the beaker. 2. Fill the beaker with 300 milliliters of water and add 20 milligrams of salt. Stir to dissolve the salt in the water. 3. Draw a line using the permanent marker around the middle of each test tube, along it’s circumference. 4. Fill the two test tubes with water and place them upside down inside the beaker. The exposed copper wire should be positioned inside the mouth of the test tube. 5. Have all of the rest of your material out in front of the area you are going to be experimenting in. After you must conduct the experiment and record your observations in your project data book. OBSERVING 1. The test is started using one 1.5 V battery. Using the jumper wires, connect the battery terminals to the copper wire hanging outside the beaker. Start the stopwatch immediately and record the time taken for the gas collected to reach the black line. 2. Repeat procedure 2-4 and conducting experiment 1 but change by adding 40mg, 60mg, and 80mg of salt into 300ml of water each time. Record the time taken for the hydrogen gas collected to reach the black line, for the different concentrations of salt. 3. Again, repeat 2-4 and conducting experiment 1, this time, change it by using 2 batteries (3V), 3 batteries (4.5V) and 4 batteries (6V). The concentration of salt in the electrolyte should be kept constant, at 20 mg of salt into 300ml of water. Record all measurements and reactions in a table, drawn in your Project Data Book. 4. Repeat the experiment for each different amount of salt and each different amount of voltage four times to observe if it will continue to get the same results each time. Last is processing and analyzing data

7. DV: The time taken to collect the released hydrogen gas. IV: DC voltage and salt concentratio n Trial 1 Trial 2 Trial 3 Trial 4 Mean/ Average Level 1 (20mg/1.5v) 60.561.064.964.062.6 Level 2 (40mg/3v) 45.846.445.846.16.025 Level 3 (60mg/4.5v) 37.639.236.238.937.975 Level 4 (80mg/6v) 20.022.721.919.320.975

8. Statement of Analysis: -The “X” axis represents my independent variable. That was the change in salt and voltage. -The “Y” axis represents the mean of each trial’s time (in minutes) on how long it took to collect the hydrogen gas at the top of the testube.

9. This shows me getting all the materials together and also shows me about to start my experiment.

10. This shows my dad and I connecting the wires together at the same time. This begins the process of electrolysis. Beginning The Experiment

11. This part of the experiment the hydrogen gas is attaching to the copper wire.

12. This shows the difference in the hydrogen collecting test tube and oxygen collecting test tube. Oxygen has lots of water left in the test tube if you compare it to Hydrogen!!!

14. Kozierok, Charles M. "AC-DC Voltage Conversion." Welcome to The PC Guide! The PC Guide, 17 Apr. 2001. Web. 01 Nov. 2011..http://www.pcguide.com/ref/power/sup/funcACDC-c.html Madison, Natalie J. "What Is an Electrode?" WiseGEEK: Clear Answers for Common Questions. Conjecture Corporation, 24 Apr. 2003. Web. 01 Nov. 2011..http://www.wisegeek.com/what- is-an-electrode.htm Moore, John T. "Positive and Negative Ions: Cations and Anions - For Dummies." How-To Help and Videos - For Dummies. Chemistry for Dummies, June 2011. Web. 01 Nov. 2011..http://www.dummies.com/how-to/content/positive-and-negative-ions-cations-and-anions.html Walker, Thomas D. "What Are Ions?" Contract Electronic Manufacturing | Micron Corp. Micron Corporation, Fall 1982. Web. 01 Nov. 2011..http://www.microncorp.com/energaire/ions.html Williams, George. "Science Fair Projects - What Happens When Voltage Is Increased during Electrolysis?" Hundreds of Science Fair Projects For Students. All Science Fair Projects, 14 Jan. 2006. Web. 01 Nov. 2011..http://all-science-fair-projects.com/