Diffusion Flashcards
(25 cards)
What is diffusion?
Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration.
True or False: Diffusion requires energy input.
False
What is the primary driving force behind diffusion?
The concentration gradient.
Fill in the blank: Diffusion occurs in _______ and _______.
gases; liquids
What is required for diffusion to occur?
A concentration gradient.
Multiple Choice: Which of the following factors can affect the rate of diffusion? A) Temperature B) Size of molecules C) Concentration gradient D) All of the above
D) All of the above
Short Answer: Describe one real-life example of diffusion.
The smell of perfume spreading in a room.
What happens to molecules during diffusion?
They move randomly and tend to spread out evenly in a given space.
True or False: Diffusion can occur in solids.
False
What role does temperature play in diffusion?
Higher temperatures increase the energy of molecules, leading to faster diffusion.
Fill in the blank: In biological systems, diffusion is important for _______ of nutrients and gases.
transport
Multiple Choice: Which of the following is NOT a type of diffusion? A) Simple diffusion B) Facilitated diffusion C) Active diffusion D) Osmosis
C) Active diffusion
What is osmosis?
The diffusion of water across a selectively permeable membrane.
True or False: Diffusion can occur without a membrane.
True
What is facilitated diffusion?
The process of diffusion that requires specific transport proteins to help move molecules across a membrane.
Fill in the blank: Molecules move from areas of _______ concentration to areas of _______ concentration during diffusion.
high; low
What is the effect of a steep concentration gradient on diffusion rate?
It increases the rate of diffusion.
Multiple Choice: Which gas is commonly used to demonstrate diffusion? A) Oxygen B) Carbon Dioxide C) Nitrogen D) All of the above
D) All of the above
What is the significance of diffusion in cellular respiration?
It allows oxygen to enter cells and carbon dioxide to exit.
True or False: Diffusion can occur in vacuum.
False
Fill in the blank: In diffusion, molecules move from an area of _______ to an area of _______ until equilibrium is reached.
higher concentration; lower concentration
What is equilibrium in the context of diffusion?
It is the state where the concentration of molecules is uniform throughout a space.
What is the role of membrane permeability in diffusion?
It determines which molecules can pass through a membrane during diffusion.
True or False: All molecules diffuse at the same rate.
False
