Living organisms are composed of about 25 chemical elements Most - - PowerPoint PPT Presentation

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Jul 18, 2023 219 likes •415 views

Living organisms are composed of about 25 chemical elements Most Common Elements In the Human Body (96%) Essential Trace Elements In the Human Body (0.01%) Trace elements are common additives to food and water Elements can combine to form

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Living organisms are composed of about 25 chemical elements

Most Common Elements In the Human Body (96%) Essential Trace Elements In the Human Body (0.01%)

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Trace elements are common additives to food and water

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Elements can combine to form compounds

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Atoms consist of protons, neutrons, and electrons

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Isotopes

Carbon-12: Protons-6 Neutrons-6 Electrons-6
Carbon-13: Protons-6 Neutrons-7 Electrons-6
Carbon-14: Protons-6 Neutrons-8 Electrons-6

Carbon Will Always Have 6 Protons Only The Number Of Neutrons Change in Isotopes!

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Radioactive isotopes can help or harm us

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Electron arrangement determines the chemical properties of an atom

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Ionic bonds are attractions between ions of opposite charge

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Covalent bonds join atoms into molecules through electron sharing

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Unequal electron sharing creates polar molecules

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Hydrogen bonds are weak bonds important in the chemistry of life

Partial Positive End Partial Negative End

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Hydrogen bonds make liquid water cohesive

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Waters hydrogen bonds moderate temperature

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Ice is less dense than liquid water

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Water is the solvent of life

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The chemistry of life is sensitive to acidic and basic solutions

Acidic Solutions have A High Concentration of H+ Ions Neutral Solutions have equal concentrations

f H+ and OH-

Ions Basic Solutions have a low concentration on H+ Ions

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The search for extraterrestrial life centers on the search for water

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