Biology Lab 4 Results Flashcards
is the movement of the carmine powder random or directional
random
does the movement of the carmine powder particles ever stop
no
do smaller particles move more rapidly than larger particles?
smaller particles
what did it look like when the particles of the carmine powder were moving
the smaller molecules were bouncing off of each other and the larger molecules looked to be sliding
are you actually observing molecular movement
no, can’t see molecules because we were using a light microscope, we were actually just viewing the result of molecular movement
what happens to the cells of the elodea leaf when in water
they swell; hypotonic
what happens to the cells of the elodea leaf when in saline
they stay the same; isotonic
what happens to the cells of the elodea leaf when in 1M NaCl
the cells shrink; hypertonic
which solution had the greatest osmolarity
saline
how was the carmine powder able to move
when the water hit the powder, it moved
how do you calculate percent change
weight change/initial weight X 100
what parts of the chart are needed to make the excel graph
the molarity column and the percent change in mass column
how else can you write the percent change in mass eqaution
9B-A)/A*100
what are you trying to calculate by using the formula in the excel graph
the unknown concentration
what is the solvent for cells
water
what is usually the solvent in cells
- sodium chloride
- sucrose
- cytoplasm
will water pass through
water cannot pass through, by itself, easily
what moves through the cell membrane easily
nonpolar and small particles
what are some examples of substances that can move through a membrane easily
- O2
- CO2
- H2
what is the facilitated diffusion of water
osmosis
what does water need to move through a membrane
channel proteins
how does active trasnport work
lower concentration to higher concentration
what tells you a direction of cell movement
osmolarity and tonicity
what is Brownian movement
small molecules hit bigger molecules to change the direction
what is the result of molecular movement
diffusion and Brownian movement
what does the y on the excel graph represent
the percent change in mass
what happens in a hypertonic solution in plants
the cells separate from the cell wall; plasmolyzed
turgid
swell
animals:
- cells burst
plants:
- normal to sustain structure and function
flaccid
limp
animals:
- equilibrium
plants:
- limp
what is the physiological saline
0.2M NaCl
- isotonic
R^2
indicates how well the date points fit the trendline
what would a perfect fit equal to
R^2=1
what is osmolarity
measure of solute concentration of solute in solution
what happens to cells in a hypertonic solution
cells lose water
what happens in a hypotonic solution
cells gain water
