science lab project help!!

Anonymous
timer Asked: Nov 16th, 2016

Question description

this is a virtual lab

Directions and template to be filled will be attached

(basically you need to make a hypothesis..... variable etc...)


Unit 2.7 Portfolio: Changes Between a Solid and a Liquid Getting Started: How does the Gizmo Work? 1. Complete lesson pages 1-2 as normal. 2. Click on Phase Changes on lesson page 3 to open the experiment Gizmo. a. When the Gizmo opens you will see a beaker filled with water. The water is being stirred constantly. A thermometer measures the temperature of the water in the beaker. 3. Make sure the “Macro view” button is selected toward the bottom of the experiment window. 4. Set the ice volume to 50cc. 5. As time passes, the ice will begin to melt as the beaker heats up. To speed up this process, set “Add/remove heat energy” to 400 J/s. 6. Click the Play button and observe the temperature of the ice/water mixture. 7. When the ice cube melts click the pause button and read the time above. This is the amount of time it took the ice cube to melt and what you will be recording as your data when you do the experiment below. Now that you know how the Gizmo works you are ready to begin the experiment. The experiment directions begin on the next page. The Experiment 1. Click the reset button. 2. Leave the “Add/remove heat energy” on 400 J/s. This will be one of your control variables. 3. Decide on an independent variable. You have three choices: “ Initial Water temperature”, “Ice volume”, or “Altitude”. 4. You will only change the option you choose as your independent variable. The other two options will then become two more of your control variables. a. Note: before you start the experiment, you can leave the two options you did not choose on 0 or you can change them to a different value. Once you set these two values then leave them alone for the rest of your experiment. b. Example: if your independent variable is “Ice Volume” then you can elect to leave “Altitude” and “Initial Water temperature” at 0 or enter a value of your choice at this time. Once these values are set, you will leave them alone. 5. Now back to your independent variable…. a. A good scientist always tries to have several tests and multiple trials of each test. A general rule to follow is 3 tests and 3 trials of each test. b. Decide what your independent variable values will be. IMPORTANT: you want to choose values that are a good distance from each other so your data gives you good information. c. For example: if your independent variable is “Ice volume” then reasonable choices for your test values are 15cc, 30cc, and 45cc. 6. Now for your dependent variable… a. You will measure the time it takes for the ice cube to melt. b. NOTE: as the experiment is happening, you will need to watch the ice cube so you can record the time when it melts. The easiest way to get an accurate time is to watch the ice cube melt and hit the pause button as soon as the ice cube has melted completely. 7. With your variables set, you will now start writing your lab report. Start with the Research Question, then write the Hypothesis, then make sure you recorded everything in the variables section, including the values for the independent and control variables. Write your materials and then write the Procedure steps. 8. Create your table in the Data section so you will be able to record your data. a. Remember your 3 tests are the three values you chose for your independent variable. b. You will have 3 trials of each test. c. Your dependent variable is the time when the ice melts in seconds. d. It is much easier to create tables and graphs in Word so unless you are an Excel pro, use Word. There is also the added advantage of having your lab report, table, and graphs all in the same document which makes it easier to grade and easier for you to do grade recovery if needed. e. Within your Word document click Insert Table then choose the number of rows and columns needed by moving the mouse over the grid. The highlighted cells are the ones Word will include in your table. Don’t worry if you do not select the correct number of rows and columns initially because you can change them after the table is created. f. Since this is the first experiment, I have provided a sample table below to help you figure out what is needed for this experiment. [Insert Table Title Here] [Identify Independent Variable with Units] Amount of Time in Seconds for Ice Cube to Melt Trial 1 Trial 2 Trial 3 [Insert Independent Variable Value #1] [Insert Independent Variable Value #2] [Insert Independent Variable Value #3] 9. After your data table is setup, begin the experiment. Record your data in your table. 10. Once you have gathered all the data, complete your lab report and submit to the 2.7 portfolio drop box. a. The next section is your Data Analysis section which will be your graph of the data. All graphs in this class should be line graphs! b. Then you will have your Conclusion and Evaluation sections. c. Last is your Works Cited section. You must have a credible source cited because you are not the expert. Credible sources include your textbook or reputable online sources. NO Wikipedia, Yahoo Answers, Wiki Answers, or other similar sites. If you need help finding a source, then ask me d. If you need help remembering how to MLA formatting click here.
Research Question: Combine the independent and dependent variables in a one-sentence question. Hypothesis: Identify the outcome for each test and give a scientific explanation for why the predictions will happen. The reader should know the expected order of the results (in other words, which value will be the highest, which one is in the middle, and which one will be the lowest). Use your vocabulary words in the explanation of why the predictions will happen. Variables: make sure all variables have units and the values are identified. Independent: this is what changes between each test. Dependent: this is what is measured. Controls: (identify at least 3 controls) this is what could have changed, but stays the same for each test. Materials: List all the materials needed. Procedure: This is a numbered list of steps. The reader should be able to replicate your experiment exactly by following your procedure steps. These are command statements, similar to a recipe. Data: This is a table where all the data and observations are recorded. Make sure your table has a descriptive title and all columns are labeled with units. Good table titles are complete sentences that include the independent and dependent variables. [Insert a Descriptive Title Here] [Insert Independent Variable Here] [Insert value #1] [Insert value #2] [Insert value #3] Time in seconds for ice cube to melt. Trial #1 Trial #2 Trial #3 Average Data Analysis: this is a graph of the important data that answers the research question. Make sure you have a descriptive title and axis labels with units. Good graph titles are complete sentences. Time in seconds for ice cube to metl [Insert Descriptive Title Here] 4.5 4 3.5 3 2.5 Trial #1 2 Trial #2 1.5 Trial #3 1 Average 0.5 0 [insert independent value #1] [insert independent value #2] [insert independent value #3] Trials of [Insert Independent Variable with Units Here] Conclusion: Always a paragraph! Identify how the hypothesis was supported, partially supported, or unsupported in the first sentence. Then use the data to explain how the hypothesis was supported and to explain the answer to the question. Then connect the results to the actual science by explaining the science happening and if the science agrees with the experiment results. This is a good place to use a source to back up your explanation. Cite the source with intext citations in MLA format. Evaluation: Identify the possible errors, how the possible errors may affect the data, and specifically how the errors can be improved. (With simulation experiments it can be hard to come up with possible errors so you can think of doing the experiment in real life instead to talk about the possible errors.) Remember that possible errors come from where mistakes could happen in the procedure steps. Then state the importance of the results to “real” life. Works Cited: Cite sources in MLA format.

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