1 - Key Concepts - Diffusion Flashcards
1
Q
How can energy be measured using calorimetry?
A
a piece of food is burned and the released energy is used to heat a known quantity of water. The temperature change of the water is then used to determine the amount of energy in the food
2
Q
How are substances transported in and out of cells?
A
Diffusion
Osmosis
Active Transport
3
Q
What is Diffusion?
A
Gradual movement of particles from places: higher conc -> lower conc
4
Q
What is Osmosis?
A
The net movement of water molecules across a partially permeable membrane from high -> low conc
5
Q
What is Active Transport?
A
movement of particles across a membrane against a concentration gradient
6
Q
How do you calculate percentage gain & loss/mass in osmosis?
A
final mass - initial mass x100
initial mass
