Take this video from Hank Green as revision as well as learn addition stuff related to chemical bonding such as the Coulomb law. Must say he is fast and I have to watch, pause and repeat a few times to take down all the important notes🙂
Let’s look into how water bond. Learn the effect of the lone pairs of electron in the bonding.
And the following video explains how the polarity in water molecules covalent bonding creates the intermolecular force called “hydrogen bonding” which is very important and affecting the properties of water we have now.
Do you still remember “The Tale of Peter Rabbit”?
Well, would like to recommend a nice movie telling story about the author for this beautiful children book, Beatrix Potter, “Miss Potter”.
I am glad to know another beautiful soul.
Beatrix Potter was an English writer, illustrator, natural scientist, and conservationist best known for her children’s books featuring animals, such as those in The Tale of Peter Rabbit. She overcame many obstacles in her quest to become a writer, including a domineering mother and the chauvinism prevalent in Victorian England. And the part that touch me the most, was her being a fierce campaigner on local conservation issues and passionate about preserving a way of life.
Beatrix purchased a considerable amount of land in the Lake District and when she died in 1943, she left 4,000 acres of land and countryside to the National Trust, as well as 14 farms. All of these farms are still working farms managed by National Trust tenant farmers, in accordance with her wishes.
You can watch this movie via http://fmovies.to/film/miss-potter.4qr67/oo5kv4
Something I read: “Selenium Benefits: A Unique Trace Mineral That Provides Powerful Cancer Prevention“. One of the supplement my nutritionist prescribe.
Something new I learnt from the article:
About mercury: (since I also suffer from high level of mercury in blood)
Mercury binds easily to fatty tissue especially in the kidneys, liver, and brain.
One of the best detoxifying agents to prevent mercury build-up is the mineral selenium.
A deficiency of trace minerals can readily allow mercury to accumulate in and contaminate cells by inhibiting their natural energy producing abilities, blocking enzymatic activity and shutting down antioxidant systems.
About selenoprotein enzymes:
selenoprotein enzymes are generated by the body by incorporating the trace mineral selenium into proteins. These enzymes function like antioxidants, destroying free radicals thus limiting oxidative damage. They also stimulate thyroid function and optimize the immune system.
When mercury binds to selenium, the production of selenoproteins is reduced. This promotes immune dysfunction and abnormal thyroid function.
selenium is a “mercury magnet”
When mercury and selenium bind, this new compound cannot be absorbed by the body so it is removed as waste.
We must include a surplus of selenium in our body to reduce mercury levels.
Mercury contamination might require you to increase selenium consumption up to 1000 mcg each day. It is recommended that one consume between 200-400 micrograms of selenium daily. Although too much selenium is toxic.
Brazil nuts are the best food source of selenium with around 50-75 mcg selenium per nut. A small handful (max 6 nuts) will supplement the selenium you need for the entire day. Other excellent sources include pasture-raised eggs, mushrooms, shellfish, meat (including organ meats), as well as seeds.
And the most alarming, to me,
Selenium Deficiency Linked to Thyroid Cancer
Specifically, low selenium levels are associated with an increased risk of thyroid cancer.
This is due to the crucial role it plays on protecting the thyroid gland from damage.
The incorporation of selenium into selenoproteins is essential for optimal thyroid health and for the protective effects of these antioxidant systems throughout the entire body.
Now it kind of explains most of the thing, if not everything for my case.
In the subsequent video, we learn how to draw dot-cross diagram to represent the covalent bond
A recap of the octet rule: it is a chemical rule of thumb that reflects observation that atoms of main-group elements tend to combine in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.