{"id":153,"date":"2018-01-17T14:11:02","date_gmt":"2018-01-17T20:11:02","guid":{"rendered":"http:\/\/myallaboutyou.com\/?page_id=153"},"modified":"2026-08-25T07:34:23","modified_gmt":"2026-08-25T12:34:23","slug":"chemistry","status":"publish","type":"page","link":"https:\/\/my-all-about-you.com\/es\/reference\/chemistry\/","title":{"rendered":"Qu\u00edmica"},"content":{"rendered":"
\n

Una nota sobre estos materiales de archivo<\/h2>\n\n\n

This page preserves study notes prepared during earlier coursework. Definitions, examples, links, and instructional requirements may have changed. It is provided as an educational and historical reference; readers should verify material against current course texts and authoritative sources.<\/p>\n\n\n

Regresar al estudio<\/a>  |  Visita Body & Grace<\/a><\/p>\n<\/div>\n\n\nMany Chemistry students I know refer to Tyler Dewitt<\/a> on YouTube so that could better grasp the Chemistry a little better.\u00a0 Please refer to his channel if you should have additional questions.\u00a0 I will only be posting some of the basics from my class.\u00a0 This is not meant to give detailed information.\u00a0 If I come across additional information, I will revise this post as needed.\u00a0 If you think I need to add something, feel free to drop me a note, so that I can check it out.\u00a0 Enjoy Chemistry.\u00a0 Everything is made up of it.\n\nChemistry is the study of matter in regards to composition, properties, and transformations.\u00a0 Matter has mass and volume.\u00a0 There are two types of which are discussed in basic chemistry (Naturally occurring and synthetic matter).\n\nSome types of naturally occurring matter are cotton, sand, and digoxin which is a cardiac drug.\u00a0 Synthetic matter is human-made which a few are nylon, Styrofoam, and ibuprofen.\n\nMatter can be a solid, liquid or gas.\u00a0 Solids have a definite volume, and maintains shape which the particles close together.\u00a0 But, liquids have a definite volume, but doesn’t maintain its shape.\u00a0 Generally the particles are close together and move around freely.\u00a0 Finally, gas has no shape or volume, and is able to fill the shape of whatever container it is in.\u00a0 Gas particles are free flowing and far apart.\n\nThere are two different states of matter which are chemical and physical.\u00a0 Chemical properties are determined by a substance ability to be convert itself into another substance.\u00a0 Some various methods of chemical change are:\u00a0 reactivity, combustibility, flammability, rusting, corroding, and acidity.\u00a0 Eating of an apple is an example of metabolizing.\n\nOn the other hand, physical properties are able to be observed or measured without changing the composition.\u00a0 Some methods of physical change are color, odor, phase, luster, shape, malleability, density, shape, solubility, and ductility.\u00a0 Water is a good example physical change because water is still water whether it’s frozen, liquid, or a gas.\n\nMatter can be classified as either a pure substance or a mixture.\u00a0 A pure substance is composed of a single component and cannot be broken down into other pure substances by a physical change.\u00a0 It has a definite and constant composition whether it an element or compound.\u00a0 Salt, sugar, and water are all examples of a pure substance which are compounds.\n\nA mixture is composed of more than one substance and can vary in composition.\u00a0 Once sugar and salt is dissolved in water, it is a mixture because it can be separated into its components by a physical change.\u00a0 Chicken noodle soup, kool aid, banana splits, and salt water are all mixtures.\n\nSome questions to consider to help make a decision in regards to matter classification are:\n

    \n\t
  1. Can it be separated by a physical process?\u00a0 If yes, it is a mixture.\u00a0 If no, then it’s a pure substance.<\/li>\n\t
  2. In order to decide whether pure substance is a compound or an element?\u00a0 If it can be broken down, then it is a compound.\u00a0 If not, then it is an element.<\/li>\n<\/ol>\nConversion Factors<\/strong> will be used extensively throughout basic Chemistry class.\u00a0 It is written as equalities.\u00a0 The basic method for conversion is below:\n\nOriginal quantity X conversion factor = desired quantity\n\nExample:\u00a0 original quantity (20 lbs) X conversion factor =? Kilos<\/strong>\n\nFrom the reference page we know that 1 lb = approx. 2.21 kilos<\/strong>.\u00a0 Therefore, we will write work it as 20 lbs. X (1kg\/2.21 lbs) = 9.0498 kg.\u00a0 <\/strong>We put pounds at the bottom, so that it can be cancelled out.\n\nSometimes, you will you have come more than one unit.\u00a0 For example: converting miles to meters or hours to seconds.\u00a0 \u00a0Convert each unit at a time.\n\nExample:\u00a0 Car traveling 45 mph to meters and hours to seconds\n\n45miles\/hour\u00a0 X\u00a0 1609 m (meters)\/1 mi (miles) X\u00a0 1 hr\/3600 s (seconds) = 20.11 m\/sec\u00a0\u00a0\u00a0 <\/strong>\n\nWord of warning<\/strong>:\u00a0 Watch your abbreviations.\u00a0 Notice how meters (m) and miles (mi) are very similar.<\/strong>\n\n\u00a0<\/strong>Significant Figures<\/strong>\n\n\u00a0<\/strong>Exact Numbers\u00a0\u00a0 <\/strong>Results from counting objects or part of a definition\n\nInexact Numbers <\/strong>contains a bit of uncertainty and is a unit of measurement or observation\n\nSignificant figures are all the digits in a measured number including one estimated digit.\u00a0 All nonzero digits are always significant.\n
      \n\t
    1. Nonzero digits are always significant.<\/li>\n\t
    2. Any zeros between nonzeros are significant.<\/li>\n\t
    3. A final zero or trailing zeros are only significant if there is a the decimal portion.<\/li>\n\t
    4. A zero does not count as a significant figure when it occurs: at the beginning of a number or at the end of a number that does not have a decimal<\/li>\n<\/ol>\nWhen we are taking a temperature we are measuring how hot or cold an object is.\u00a0 The three temperature scales which are used are degrees in Fahrenheit and Celsius, and Kelvin.\n\n\"Temperature+Conversion+Formulas\"\n\nDensity is a physical property that relates the mass of a substance to it volume.\n\n\"Density\n\nMass is usually in g and volume is measured in mL or cc.\n\nAnother visual way to remember the formula is to use the density triangle.\n\n\"mass\n\nSpecific gravity is a quantity that compares the density of a substance with the density of water at the same temperature.\n\n\"formula-for-a-specific-gravity\"\n