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Chalcogens

Cellular respiration/photosynthesis review

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Ch. 2: The Chemical Context of Life

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Chapter 2 The Chemical Context of Life Camobell Bio 9th Edition

2.1 An element is a substance that cannot be broken down to other substances by chemical reactions. A compound is a substance consisting of two or more different elements combined in a fixed ratio. Essential elements are needed for a healthy life and to reproduce. Humans need 25, plants need 17 Oxygen (O), Carbon (C), Hydrogen (H) and Nitrogen (N)?make up 96% of living matter Calcium (Ca), Phosphorus (P), potassium (K), sulfur (S), and a few other elements accounting for most of the remaining 4% of an organism's mass. Trace elements are required by an organism in only minute quantities. ? 2.2 Protons and neutrons are electrically charged. Proton= positive, electron=negative, neutron=neutral

Chapter 3 Notes

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biochemistry

BIOL 1020 - CHAPTER 2 LECTURE NOTES Chapter 2: The Chemical Context of Life You must understand chemistry to understand life (and to pass this course)! Elements and Atoms Elements ? substances that cannot be further broken down into other substances (at least by ordinary chemical reactions) every element has a chemical symbol (H for hydrogen, O for oxygen, etc.); this is most familiar from the periodic table Essential elements: elements that an organism needs to live. They are similar along different organism but there is some variation Trace element: elements that are required by an organism in only minute quantities E.g.: Iron (Trace) Oxygen, Hydrogen, Nitrogen, and Carbon(Essential elements)

Essential Chemistry for Biology

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Essential Chemistry for Biology Chapter 2 1. There are 92 naturally occurring elements on Earth. What is an element? substances that cannot be broken down 2. Four of the elements oxygen, carbon, hydrogen and nitrogen make up about 96% of the weight of the human body. Oxygen is the most abundant element in the body. 3. Trace elements are required in very small amounts, but we cannot live without them. 4. Why is the trace element iodine important in the body? essential for hormone produced by thyroid gland 5. Why is the trace element fluoride important in the body? needed component of healthy bones and teeth 6. Know the chemical element for each of the following symbols: C; carbon H; hydrogen O; oxygen

APHuG glossary

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Acid deposition Sulfur oxides and nitrogen oxides, emitted by burning fossil fuels., enter the atmosphere ? where they combine with oxygen and water form sulfuric acid and nitric acid ? and return to Earth?s surface Acid precipitation Conversion of sulfur oxides and nitrogen oxides to acids that return to Earth as rain, snow, or fog Agribusiness Commercial agriculture characterized by the integration of different steps in the food-processing industry, usually through ownership by larger corporations Agricultural density
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