Biology Lab 4 Results

Question 1

is the movement of the carmine powder random or directional

Answer 1

random

Question 2

does the movement of the carmine powder particles ever stop

Answer 2

no

Question 3

do smaller particles move more rapidly than larger particles?

Answer 3

smaller particles

Question 4

what did it look like when the particles of the carmine powder were moving

Answer 4

the smaller molecules were bouncing off of each other and the larger molecules looked to be sliding

Question 5

are you actually observing molecular movement

Answer 5

no, can’t see molecules because we were using a light microscope, we were actually just viewing the result of molecular movement

Question 6

what happens to the cells of the elodea leaf when in water

Answer 6

they swell; hypotonic

Question 7

what happens to the cells of the elodea leaf when in saline

Answer 7

they stay the same; isotonic

Question 8

what happens to the cells of the elodea leaf when in 1M NaCl

Answer 8

the cells shrink; hypertonic

Question 9

which solution had the greatest osmolarity

Answer 9

saline

Question 10

how was the carmine powder able to move

Answer 10

when the water hit the powder, it moved

Question 11

how do you calculate percent change

Answer 11

weight change/initial weight X 100

Question 12

what parts of the chart are needed to make the excel graph

Answer 12

the molarity column and the percent change in mass column

Question 13

how else can you write the percent change in mass eqaution

Answer 13

9B-A)/A*100

Question 14

what are you trying to calculate by using the formula in the excel graph

Answer 14

the unknown concentration

Question 15

what is the solvent for cells

Answer 15

water

Question 16

what is usually the solvent in cells

Answer 16

• sodium chloride
• sucrose
• cytoplasm

Question 17

will water pass through

Answer 17

water cannot pass through, by itself, easily

Question 18

what moves through the cell membrane easily

Answer 18

nonpolar and small particles

Question 19

what are some examples of substances that can move through a membrane easily

Answer 19

• O2
• CO2
• H2

Question 20

what is the facilitated diffusion of water

Answer 20

osmosis

Question 21

what does water need to move through a membrane

Answer 21

channel proteins

Question 22

how does active trasnport work

Answer 22

lower concentration to higher concentration

Question 23

what tells you a direction of cell movement

Answer 23

osmolarity and tonicity

Question 24

what is Brownian movement

Answer 24

small molecules hit bigger molecules to change the direction

Question 25

what is the result of molecular movement

Answer 25

diffusion and Brownian movement

Question 26

what does the y on the excel graph represent

Answer 26

the percent change in mass

Question 27

what happens in a hypertonic solution in plants

Answer 27

the cells separate from the cell wall; plasmolyzed

Question 28

turgid

Answer 28

swell
animals:
- cells burst
plants:
- normal to sustain structure and function

Question 29

flaccid

Answer 29

limp
animals:
- equilibrium
plants:
- limp

Question 30

what is the physiological saline

Answer 30

0.2M NaCl
- isotonic

Question 31

R^2

Answer 31

indicates how well the date points fit the trendline

Question 32

what would a perfect fit equal to

Answer 32

R^2=1

Question 33

what is osmolarity

Answer 33

measure of solute concentration of solute in solution

Question 34

what happens to cells in a hypertonic solution

Answer 34

cells lose water

Question 35

what happens in a hypotonic solution

Answer 35

cells gain water