Electromagnetism -Devon Mcdaris Per 2
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This document summarizes an experiment where a soda can filled with boiling water is crushed when submerged in cooler water. The experiment uses common household items like soda cans, tongs, and a juice container instead of lab equipment. When the heated can is placed in the cooler water, the higher pressure outside crushes the can as the pressure inside drops. This is opposite a popcorn kernel popping, where the higher pressure inside causes the kernel to expand outward rather than collapse inward.
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spinach leaves. Fresh spinach bought in the store is green, and the leaves still have the
ability to do photosynthesis. Photosynthesis produces carbohydrates and oxygen and we
will use the rate of oxygen production as an indicator of how quickly the spinach leaves
actually do photosynthesis.
You will use a hole punch to make a number of small disks of spinach. These disks float
when they contain oxygen from photosynthesis. By applying vacuum to the small spinach
disks, the oxygen is forced out, and they sink. When you then place the disks in a
transparent cup with water, and expose them to light, they will produce oxygen and
eventually float. The time it takes the small disks to float is a measure of photosynthesis,
and you will test the effect of different light intensities on the floatation time.
Background:
In your first lab this semester you investigated how the UV portion of sunlight was able
to cause harm to living cells, which is not so surprising since this shorter wavelength
carry enough energy to damage the cell’s DNA. In this week’s lab we will instead use the
portion of radiation from the sun that we call daylight (380-780 nm), plenty of which
makes it down to the earth’s surface. Our eyes are sensitive to this portion of the
spectrum, and it’s also the portion plants use for photosynthesis.
The process of photosynthesis can be simplified as:
CO2 + H2O sugar + O2.
It is really divided up into two sets of reactions, the Light Reaction and the Calvin
Cycle. In the Light Reaction the plant cells use chlorophyll to capture some of the energy
in sunlight. When sunlight hits a chlorophyll molecule, electrons in the chlorophyll
GES 102 Lab #5 Spring 2015
21
molecule are excited, they ‘spin’ faster because of the absorbed energy. These excited
electrons are passed on down the line and chlorophyll will take a continuous supply of
new electrons from H2O which is broken down, producing O2. The energy in the excited
electrons is eventually used to produce two high energy molecules, called ATP and
NADPH. In the next step, the Calvin Cycle, the energy contained in ATP and NADPH is
used to help take CO2 (carbon dioxide) from the air and manufacture sugar.
Spinach plants normally get their CO2 from the air, through small openings on the
underside of their leaves, called stomata. In our experiment some sodium bicarbonate
(NaHCO3) will be added to the water, and provide the carbon needed for the small
spinach disks to do photosynthesis. The O2 produced will be trapped inside the spinach
disks and increase their buoyancy until they float.
Alongside photosynthesis, the plants also do cellular respiration. They certainly are
autotrophs and can produce their own “food”, the sugar. ...
Matter and materials webquest
This document outlines a webquest on matter and materials. It includes activities and resources for students to learn about different states of matter through experiments, games and an outline. Students will also classify materials, do an experiment on building paper bridges, and learn about recycling through additional games and resources. They are asked to complete various questions and turn in their work by a set deadline, at which point the teacher will evaluate based on timely submission, completion of all activities, and presentation.
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