Part 1A: Designing the Experiment folecules of any substance move through the me
ID: 593520 • Letter: P
Question
Part 1A: Designing the Experiment folecules of any substance move through the medium they are in. In diffu- molecules move from their higher concentration to the lower concentra- sion, tion. The rate of diffusion is affected by various parameters such as physical state of the medium, temperature and molecular weight of the substance. The medium in which diffusion occurs can be in three different physical states: solid, liquid or gas. As you may already know, different physical mediums have different arrangement of atoms and molecules. Solid medium is the most organized and gas is the least organized with liquid state being in-between. We will study whether or not the physical state of the medium (solid and liquid) has any effect on the movement of substances. We will compare move- ment of a colored substance in solid medium (agar plate) and liquid medium (water). In Part 1A, you will first apply scientific method, design experiment and predict outcomes. In Part 1B, you will actually do the experiment, collect data and derive conclusions to see if your hypothesis can be accepted/revised or rejected. The Materials Given to You are: 1. Mediums in two different physical states a. Liquid: DI Water (use tap water) b. Solid: Agar plate 2. Substance: Congo red 3. Ruler for measurement 4. Empty petri plate 5. Measuring CylinderExplanation / Answer
1. The objective of the study is to compare the movement of a colored substance (congo red) in solid medium (agar plate) and liquid medium (water).
2. The observation that may have caused this study is "The rate of diffusion is affected by various parameters such as the physical state of the medium, temperature and molecular weight of the substance.
3. The hypothesis is "Solid medium is the most organized, gas is the least organized with liquid state being in-between." i.e. The congo red molecules move from agar plate to water.
4. The experiment is simply done by using diffusion principle.
Description: During diffusion, the molecules of substance move from their high concentration (solid phase) to low concentration (liquid phase).