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 am not asking for too much, thank you. 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?