Question: How does the membrane in a cell move nutrients into and out of an animal and plant cell?
Hypothesis: If the liquid outside a membrane is thicker than the liquid inside the membrane, the liquid inside the membrane will move out to balance the concentration.
Variables:
Independent Variable: The liquids each egg was placed in: Egg 1 is placed in water. Egg 2 is placed in corn syrup.
Dependent Variable: The measured diameter of the two eggs after sitting in either water or corn syrup.
Controlled Variable: The parts of the experiment we did not test were the vinegar, the glass jars, or the amount of time in which the eggs were placed in each liquid.
Materials:
2 Raw Eggs, Vinegar, Water, Tray, Three Jars, Corn Syrup, Balance, Tape Measure, Plastic Spoons, Calculator
Procedures:
Day 1:
1.) Adjust the triple-beam balance so that it is set at zero. Place one of your jar lids (open faced) onto the balance tray, and move your weights until the arrow floats in the middle. Record this measurement.
2.) Place one of your eggs in the upside down lid and move the weights on the balance until the arrow floats in the middle. Record this total measurement.
3.) Subtract lids measurement from the total measurement to find the mass of the raw egg. Record this measurement.
4.) Repeat steps 2 and 3 with you second raw egg and record your measurement.
5.) Using the tape measure, find the diameter of each egg by wrapping the tape around the largest part of the egg. Record you measurement in centimeters.
6.) Using masking tape and a sharpie, write down a partners name and egg 1 on a strip of tape. Place on one of your jars.
7.) Write down a partners name and egg 2 on a strip of tape and place on another jar at your table.
8.) Pour 200 mL of vinegar into two jars with lids and CAREFULLY lower two eggs into each jar using the plastic spoons. Tighten the lids and leave the eggs inside for one day.
9.) Observe the two eggs in the jars.
10.) Fill in your data on the chart for eggs 1 and 2 in vinegar.
Day 2:
1.) Use a spoon to carefully remove the eggs from the jars and GENTLY rinse them in the tray filled with water (they are fragile).
2.) Repeat steps 1 through 5 from day 1 and record your information.
3.) Observe what has happened to the two eggs and record your findings on your chart.
4.) Pour 200 mL of water into a jar. Label jar with a partner’s name and egg 1 in water.
5.) Pour 200 mL of corn syrup into a jar. Label jar with a partner’s name and egg 2 in corn syrup.
6.) Carefully lower an egg into each jar. Leave the eggs inside of jars sealed for one day.
Day 3:
1.) Use a spoon to carefully remove the eggs from the jars and GENTLY rinse them in the tray filled with water (they are fragile).
2.) Repeat steps 1 through 5 from day 1 and record your information.
3.) Observe what has happened to the two eggs and record your findings on your chart.
Data Chart: