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Normal atoms except for hydrogen 1 proton no neutrons

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Normal Atoms Except for hydrogen (1 proton / no neutrons), every atomic nucleus in normal matter is made of both protons and neutrons. Typically, the number of protons and neutrons is the same. Protons in the nucleus are positively charged, and repel each other. Neutrons are neutral. They separate the protons slightly, making the atom stable. Isotopes An isotope is a variant of an element, with a different # of _________ than is typical. This makes a nucleus unstable. Image: Isotope , GRAC From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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Isotopes & Radioactivity Isotope is ______________ if nucleus is unstable. Most isotopes disintegrate spontaneously with the release of energy by processes of nuclear or radioactive decay . When the nucleus changes in structure, energy and/or subatomic particles are given off. Other than radioactivity, isotopes behaves similarly to the natural variant. When controlled, radioactive isotopes can be valuable medical tools. (Ex. Gamma camera can produce images of soft tissue when radiopharmaceuticals are injected into or ingested by patient.) 1. Schizophrenic female 2. Female with depression 3. Healthy female From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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Simple Reactions Types From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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Synthesis, Decomposition & Exchange Reactions __________ Reaction (Combination or Anabolic Reaction) When two or more substances combine to form a single compound. Requires energy in order to take place The general form of a direct combination reaction is: A + B AB where A and B are elements or compounds, and AB is a compound consisting of A and B. Examples of combination reactions include: 2Na + Cl 2 2 NaCl (formation of table salt) 4 Fe + 3 O 2 2 Fe 2 O 3 (iron rusting) _____________ Reaction (Catabolic Reaction) The opposite of a composition reaction. A compound is broken down. The generalized reaction formula for chemical decomposition is: AB A + B ___________ Reactions (Transfer Reaction) Atoms are moved from one molecule to another . A + BC AB + C Images: Animation decomposition reaction , Armando-Martin; Rust , Later Keiwos From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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___________ Reaction _____________ Reaction Q: Based on the reaction types we just discussed, how would you categorize the reactions below? From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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Mixtures, Compounds & Solutions From the Virtual Cell Biology Classroom on ScienceProfOnline.com
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Mixtures & Compounds __________ = Physical combination of two or more pure substances (i.e., elements or compounds). __________ = Chemical combination of two or more pure substances in a fixed, definite proportion. Examples: Mixture - Iron & Sulfur Iron filings may be mixed with powdered sulfur in any proportion. The two components are easily separated by means of a magnet, The magnet will draw out the iron from the mixture.
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