I am giving brainiest! All I need are the last two questions at the bottom the rest of this info is to help solve them. I hope I
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Molecular Structure Lab Report: Determining Polarity
Instructions: For this investigative phenomenon, you will investigate why certain substances, such as oil and vinegar, don't mix. To do so, you will combine various compounds, compare their solubility, and determine their polarity. Fill in each section of this lab report and submit it to your instructor for grading.
Title: Determining polarity
Objective(s): To test the solubility of different mixtures through polarity
Hypothesis:
Create a hypothesis that predicts the polarity of iodine solution, vinegar, vegetable oil, salt, water, and rubbing alcohol.
If the Iodine solution(or any other solution used in this experiment) is mixed with water, then we can determine through its solubility whether it is polar, nonpolar or ionic, because water widely known as polar and polar compounds cannot mix with nonpolar.
Procedures:
This lab already includes materials and a summary of steps to follow. List and explain your controlled variables, independent variable, and dependent variable for this lab.
Materials
deionized (distilled) water
rubbing alcohol
vegetable oil
iodine solution
sodium chloride (salt)
acetic acid (vinegar)
test tubes or clear plastic cups
tablespoon and teaspoon
stirring sticks
permanent marker for labeling
Safety
Always wear eye protection and use gloves when handling chemicals in a laboratory area.
Students should wash their hands thoroughly before leaving the laboratory area.
Dispose of any chemicals by washing used test tubes with soap and water or washing used cups then throwing them away in a trash bin.
Variables:
Remember, controlled variables are factors that remain the same throughout the experiment. An independent (test) variable changes so that the experimenter can see the effect on other variables. The dependent (outcome) variable will change in response to the test variable.
Controlled variables:water
Independent Variable:iodine solution
Dependent Variable:solubility(is it soluble or not)
Table 2:
(Hint: Like substances dissolve like substances, and polar solvents dissolve ionic compounds.)
Solute
Solvent
Soluble or insoluble?
Is the solute polar, nonpolar, or ionic?
Is the solvent polar, nonpolar, or ionic?
Vinegar
Water
soluble
polar
polar
Iodine solution
Water
insoluble
nonpolar
polar
Rubbing alcohol
Vegetable oil
insoluble
polar
nonpolar
Salt
Vegetable oil
insoluble
ionic
nonpolar
Water
Rubbing alcohol
soluble
polar
polar
Vinegar
Rubbing alcohol
soluble
polar
polar
Iodine solution
Vinegar
insoluble
nonpolar
polar
Vegetable oil
Vinegar
insoluble
nonpolar
polar
Were any of your substances difficult to identify as polar, nonpolar, or ionic? Explain.
How do models help scientists predict the polarity of molecules?
