IB MYP Integrated Sciences e-Assessment : Diffusion and osmosis
Exam Style Practice Questions - New Syllabus
Question (5 marks)
Artists use and apply their scientific knowledge and understanding to paint beautiful portraits and produce artwork like the portrait shown on the right. Watch the video below to answer the following questions.
Question a (1 mark)
Write down what you see happening to the colours in the video when the liquid is added.
▶️Answer/Explanation
Answer: When the liquid is added to the colours, the colours expand, the ink gets carried away with the liquid, and makes a circle.
Detailed Solution: In the video, the liquid acts as a solvent, causing the ink to spread out. This is due to the process of diffusion, where particles move from an area of higher concentration to an area of lower concentration. The liquid carries the ink particles away, creating a circular pattern as the ink disperses.
Question b (1 mark)
State the name of the physical process affecting the colours in the video.
▶️Answer/Explanation
Answer: Diffusion
Detailed Solution: The process observed in the video is diffusion. Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. In this case, the ink particles spread out in the liquid, demonstrating diffusion.
Question c (3 marks)
Explain how the rate of the process in part (b) could be changed by altering the temperature.
▶️Answer/Explanation
Answer: If the temperature rises, the molecules would be more active, and it will cause the process to happen faster.
Detailed Solution: The rate of diffusion is affected by temperature. When the temperature increases, the kinetic energy of the molecules also increases. This means that the molecules move faster, leading to a quicker spread of the ink in the liquid. Conversely, if the temperature decreases, the molecules move more slowly, and the rate of diffusion decreases. Therefore, increasing the temperature would speed up the diffusion process, while decreasing the temperature would slow it down.