Chapter 3 Essential Questions

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Recommended: The Principle Behind Diffusion & Osmosis

Chapter 3 Essential Questions

Describe and give examples for the steps of the scientific method.
The scientific method is an organized way to answer questions. The first step is to state the problem in a question, like “what happens to a person’s heart rate when they watch a movie?” The next step is to research things that would be helpful in resources like the internet, magazines, interviews, and books. Once information is researched, a hypothesis should be formed, usually in an if-then statement. For example, one could say, “If a person’s heart rate is 70 bpm, then his/her heartbeat will raise higher than that when watching a scary movie.” After, one must write the procedures down so that other people can repeat the experiment. Then it is time to test the hypothesis by doing the experiment. After gathering the data from the experiment, it has to be analyzed to draw a conclusion. If the results of the scary movie experiment show that a person’s heart rate increases over 70 bpm, then …show more content…

In diffusion, particles move from an area of high concentration to an area of low concentration until they reach equilibrium. The direction of diffusion is called the concentration gradient. An example of diffusion would be if a person sprayed air freshener in a room. The particles would move from the area of high concentration to the rest of the room, so after a few minutes, people can smell it from the other side of the room. Osmosis is the diffusion of water across a semipermeable membrane; the molecules move from an area of high water concentration to an area of low water concentration until they reach equilibrium. Water flows in the direction to dilute. For example, a person’s cells have more salt than a poot -- it has a higher concentration of solutes. Water from the pool will flow into the body faster than the water from the cells comes out, so the cell will swell up. Both diffusion and osmosis do not require no

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