Teen Tech Tip of the Week #28: Carbon, Hydrogen, and Oxygen make Photosynthesis Elemental  
Welcome Back to the blog for the next round in our Summer Reading series: Reading is Elemental. This week we will be looking at photosynthesis, an extremely important chemical reaction to all life on Earth.

(source: Wikimedia Commons)

Last week in our discussion on energy, we briefly mentioned that plants are able to convert the sun's energy into plant mass, now let's look at that process, called photosynthesis, in better detail.

Photosynthesis: a Chemical Reaction


The illustration above shows a simplification of what is happening in the natural world involving photosynthesis. We see that the energy from the sun's light (photons) creates a chemical reaction that combines (synthesizes) Carbon dioxide (CO2) and water (H20) to create some form of carbohydrate sugar (CH2O)n and leftover Oxygen (O2).

We list the equation out below, so that you can see the overall process. In our balanced reaction, we see that glucose (C6H12O6) is our representative of a carbohydrate. The important thing here is that the byproducts of this process are extremely important for life on Earth. We have to ingest carbohydrates and oxygen to have energy to live. When our bodies metabolize carbohydrates like glucose, we oxidize sugars to release energy for physiological movement (putting our bodies in motion). The byproduct of this process is CO2 which can then be stored again during photosynthesis.


For a more in depth look at the various types of chemical reactions, check out the Khan Academy video series.

Bringing It All Back Home


Again, what does this have to do with technology? Last time, we saw that when fossilized carbohydrates (hyrdocarbons--CnH(2n+2)) are burned, stored energy is released in the form of heat. That energy is converted into electricity that powers our electrical devices. The photosynthesis of hydrocarbons is the foundation for our electrical power.

For plants to continue to grow, they need balanced access to the key components of photosynthesis: water, sunlight, and Carbon dioxide (other elements like Nitrogen, Phosphorus and Potassium are crucial as well as you shall see later this summer). That balance is the basis of all gardening and agriculture. There are quite a few resources out there to help people find that balance and make their garden the most productive.

Check out these tech resources to balance light and watering in a garden and experience photosynthesis with a deeper understanding:
Join us next week as we look a little closer how Nitrogen plays an essential role in plant growth.

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